SX70 Wood Stains
Boracol
Damp Proof Membrane
Damp Proof Cream
Tanking Slurry Systems
Explore Newton
Shop Wykamol Membranes
Waterproof Membrane Kits
ISO-THERM Insulation
Nuaire PIV units
Crack Sealing
Crack Stitching Bars
Explore Soudal
Fix ALL Rewards!
'Genius Gun' Foam Range
Special Offers
Wonder Grip Hub
Harris Brushes
Protection Films
Browse All Deals
How To Damp Proof Walls
Woodworm: Ultimate Guide
How To Stop Condensation
How To Seal Window Frames
The Nuaire Drimaster ECO-3STOREY-HEAT (Model DRI-ECO-3S-HEAT-HC) is a loft-mounted Positive Input Ventilation (PIV) unit for three-storey homes that adds an integral, electronically controlled 400W heater to temper incoming air.
It delivers filtered supply air via a special aluminium ceiling diffuser incorporating an intumescent fire-block, meeting the additional fire protection needs of taller dwellings. Commissioning and day-to-day adjustments are made from the hall control behind the diffuser, with selectable airflow steps, temperature set-point control and temperature-responsive operating modes.
The system can also accept wireless boost signals from Nuaire's range of Remote Wall Switch, CO2 Sensor or RH Sensor. A 5 year Warranty (1 year Parts & Labour, 4 years Parts) offers long-term peace of mind.
Unit
Free Delivery
on orders over £100(ex. VAT, mainland UK only)
Free Help & Advice
Call 01355 222 777Mon.-Fri 8:30am - 4:15pm, or email us
Next Day Delivery
Order Before 2:30pm for Same Day Despatch (terms apply)
Great Service
A proudly independent family business with 40 years experience
✔️ Whole-home PIV for three-storey dwellings, cascading filtered air downstairs to dilute humidity, odours and pollutants.
✔️ Integral 400W heater tempers supply air at source for comfort during colder UK seasons.
✔️ Aluminium diffuser with intumescent fire-block meets safety requirements where a storey exceeds 4.5 metres.
✔️ Hall Control interface selects six airflow steps and temperature modes, with boost from wall switch or CO₂ sensor.
✔️ Loft temperature intelligence harvests free warmth, pauses in hot conditions, with long-life filters and five-year warranty.
The Nuaire Drimaster ECO-3STOREY-HEAT is a loft-mounted Positive Input Ventilation unit for taller dwellings that incorporates an electronically controlled 400 W heater to temper the incoming air. Filtered supply air is delivered via a purpose-designed aluminium ceiling diffuser that contains an intumescent fire-block, addressing the additional fire protection requirements of multi-storey properties. Commissioning and day-to-day adjustments are made from the Hall Control behind the diffuser, with selectable airflow steps, temperature set-point control and temperature-responsive operating modes. The system also accepts wireless boost signals from a remote wall switch, a CO₂ detector or a relative humidity sensor, and is supplied with a 5-year warranty comprising 1 year Parts & Labour followed by 4 years Parts.
Applying the established PIV principle, the unit introduces a gentle, continuous supply of filtered air at the head of the stairwell so it cascades through the home. This creates a subtle positive pressure that dilutes moisture, odours and everyday indoor pollutants and encourages their displacement through natural leakage paths and extract points. The outcome is effective control of surface condensation and a reduced risk of black mould across bathrooms, bedrooms and circulation spaces. The three-storey model’s aluminium diffuser contains an intumescent closure element that expands to seal the opening in the presence of significant heat from below, a key provision where any storey sits more than 4.5 m above ground level.
A key enhancement of this model is the integral 400W heater located between the fan and the diffuser. The heater is electronically managed for efficiency and governed by a dedicated outlet temperature sensor. A target supply temperature can be commissioned between 5 °C and 15 °C; when the sensed outlet temperature is below the set point, the heater modulates to temper the airstream and improve comfort in cooler seasons without compromising airflow. The unit retains loft-temperature intelligence by increasing airflow to capture useful warmth when the loft is modestly warmer than the dwelling, and by entering standby during very hot loft conditions.
Set-up is straightforward at the Hall Control located behind the diffuser. Six airflow steps are available at 10, 20, 30, 40, 50 or 60 l/s, alongside selection of temperature operating mode and the supply-temperature set point. Because the aluminium fire-block diffuser introduces additional resistance, commissioning typically uses one step higher than a comparable two-storey installation so the design airflow is achieved at the grille. Built-in RF capability enables pairing with a remote wall switch for instant boost, as well as with CO₂ and RH sensors that trigger demand-led increases during showers, cooking or periods of high occupancy.
External push-fit filters allow swift replacement and help maintain low intake resistance, preserving airflow, efficiency and supply air freshness over the service life. The ECO-3STOREY-HEAT combines intelligent control, integrated heating and enhanced fire-safe diffusion to provide a comprehensive whole-home solution for three-storey properties seeking reliable moisture management and improved indoor air quality.
Three-Storey Fire Safety Compliance: Supplied with an aluminium ceiling diffuser containing an intumescent fire-block that closes the opening under high heat, aligning the installation with the additional fire protection requirements of dwellings with a storey above 4.5m.
Integral 400W, Electronically Controlled Heater: Built-in heater with outlet temperature sensor and an adjustable 5–15°C set point tempers supply air as needed, improving comfort while using only the energy required to meet the target.
Temperature-Responsive Operating Logic: Loft-temperature sensing supports intelligent behaviour: increased airflow when loft air is warmer than the dwelling and hot-weather standby when loft temperatures climb, balancing comfort and efficiency.
Hall Control For Simple Commissioning: All primary settings are adjusted from the diffuser position inside the property, including six airflow steps, temperature mode and heater set point, enabling quick setup and easy checks.
Wireless Boost And Sensor Compatibility: RF capability allows boost via a remote wall switch and integration with compatible CO2 and RH sensors for automatic, demand-led increases when indoor conditions require it.
Low-Disruption Loft Installation: The unit hangs from a roof timber or mounts on optional anti-vibration brackets, connects to the diffuser with a short duct (maximum recommended 2m), and uses external push-fit filters for rapid maintenance.
Proven Condensation And Mould Control: Continuous, filtered positive input helps suppress surface condensation, protect finishes and improve everyday indoor air quality throughout the home.
Long Warranty For Confidence: Backed by a five-year warranty, typically year one parts and labour followed by four years parts, providing predictable life-cycle costs for homeowners and landlords.
Three-Storey Houses With A Loft: Purpose-built for townhouses and similar properties where at least one floor is above 4.5 m, delivering whole-home ventilation via the intumescent-equipped aluminium diffuser.
Refurbishment And Retrofit Condensation Projects: Ideal where you wish to limit disruption, as installation is confined to the loft and stairwell; commissioning from the hall control streamlines setup and future checks.
Energy-Conscious Ventilation With Comfort Tempering: Suited to homes that value year-round moisture control with the option to temper incoming air to a user-selected 5–15°C, avoiding draughts during colder periods.
Demand-Led Boost In Busy Households: Homes with variable occupancy or frequent showers benefit from wireless boost control and optional CO2/RH sensor pairing to raise airflow automatically when conditions peak.
On a typical UK electricity unit rate of around 26p per kWh, the Drimaster ECO-3STOREY-HEAT is inexpensive to run in background mode.
The fan alone draws roughly 2–15W depending on the commissioned speed, which equates to about 1–10p per day for continuous operation (24 hours) when no heating is applied. By design, the integral 400W heater only energises to “top-up” the supply-air temperature to your chosen set point and then modulates or switches off; it does not run continuously.
As a practical guide at the same unit rate, 30 minutes of heater use costs about 5p, one hour about 11p, two hours about 21p, and four hours about 42p. In milder weather the heater will rarely operate and the fan’s ultra-low consumption dominates; in colder spells, short, intermittent heater bursts improve comfort without materially affecting overall household energy spend.
These figures exclude your supplier’s standing charge (which you pay regardless of usage) and will scale with the exact tariff you’re on, but they provide a realistic order of magnitude based on prevailing UK unit rates.
Work only when you have safe loft access, good lighting and secure boarding. Never step on unboarded plasterboard ceilings. Wear gloves, eye protection and a dust mask because loft dust can be irritant.
Isolate the unit at its local isolator or consumer unit and treat all wiring as live until confirmed otherwise. Confirm that any fuel-burning appliances have sound flues and that existing extract fans discharge to outside. Keep tools clear of the loft hatch and do not rest weight or tools on the PIV casing or ceiling diffuser.
Electrical work must be completed by a qualified electrician using a suitable means of disconnection. The three-storey model must be used with the aluminium ceiling diffuser that contains an intumescent closure element for stairwell protection.
Choose the diffuser position in the ceiling of the top-floor landing so supply air can flow along the ceiling and then cascade down the stairwell. Keep clear of obstructions and maintain sensible separation from smoke alarms; where alarms are nearby, aim the diffuser’s open faces across an unobstructed ceiling path.
The diffuser opening is 200mm in diameter, so confirm there is a clear area for a clean circular cut. In the loft, check there is background ventilation, that water tanks are lidded, pipes are lagged, and the loft hatch seals well.
Plan the shortest, straightest route for the flexible duct between the fan and diffuser; the recommended maximum duct length is 2m, and it must not be compressed. Identify a sound roof timber from which to suspend the fan, or a joist line for an anti-vibration bracket if you prefer a rigid mount.
This model is for three-storey homes with a loft and is supplied with the aluminium stairwell diffuser; use of this diffuser type is required for dwellings with a storey above 4.5m.
Keep the duct run under 2m, with smooth bends and airtight joints, and avoid crushing or compressing the duct as this will reduce performance. Provide a local two-pole isolator and mount the pre-wired power supply on a firm surface in the loft.
Where a smoke or CO alarm system is present, wire the fan’s automatic shut-down input to a compatible alarm relay so the PIV stops on an alarm signal; this shut-down interlock is required for three-storey installations. Maintain sensible separation between the fan’s low-voltage leads and other cables for good practice.
Make The Area Safe: Isolate the supply, lay secure loft boarding to reach the work area comfortably, and bring the unit, aluminium diffuser, flexible duct, ties and fixings to hand.
Mark And Cut The Diffuser Opening: On the top-floor landing ceiling, mark a 200mm circle in the chosen position and cut a clean opening, checking there is clear space above for the diffuser body and spigot. Offer up the diffuser parts to confirm fit and orientation so the open faces discharge across an open ceiling path.
Fit The Aluminium Diffuser With The Intumescent Fire-Block: Assemble the diffuser in the ceiling per its fixing stack: spigot plate above, ceiling plate below, and the lower diffuser plate fixed through the spacers into the studs so the assembly is tight and square. This diffuser is specific to three-storey applications and must be used with this model.
Mount The Fan Unit In The Loft: The standard method is to suspend the unit from a suitable roof timber using the hanging cord, ensuring a secure fixing point. If you prefer joist mounting, fit an anti-vibration bracket and secure to a solid joist line. Keep sufficient clearance to remove and replace the external filters.
Connect And Secure The Duct: Push the flexible duct fully over the fan outlet spigot and secure it with the supplied tie, then repeat at the diffuser spigot. Keep the route under 2m, avoid tight bends, and ensure every joint is airtight. Do not install the duct in a compressed state.
Install The Power Supply And Make The Electrical Connection: Fix the pre-wired power-supply module to a suitable timber surface and ask a qualified electrician to connect it via the supplied fused spur to a 230V supply, providing a local isolator. Dress the low-voltage output neatly to the fan.
Provide The Smoke / CO Alarm Shut-down Link: Where smoke or carbon-monoxide alarms have relay bases, wire the fan’s shut-down input to the alarm contacts so the unit stops automatically on an alarm condition. This interlock is required in three-storey properties.
Commission The Unit: Restore power. From the hall control behind the diffuser, select one of six airflow steps to suit the dwelling and then set the temperature operating mode. Because the aluminium fire-block diffuser adds resistance, commission one speed step higher than you would for a two-storey installation to achieve design airflow. Set the heater supply-temperature target between 5°C and 15°C; the integral 400W heater modulates to meet this set-point using the outlet sensor. Confirm a smooth, even supply at the diffuser and quiet running in the loft.
Final Checks: Confirm the duct is not compressed, that joints are airtight, that the diffuser has sensible separation from smoke alarms, and that the isolator is labelled. Record the chosen speed and temperature settings for the household.
The Drimaster ECO-3STOREY-HEAT supports Nuaire’s RF accessories and can be paired with one Relative Humidity Sensor (DRI-ECO-RH), one Carbon-Dioxide Sensor (DRI-ECO-CO2) and one Wireless Wall Switch (DRI-ECO-4S). Multiple devices of the same type cannot be used together. All RF communication for these devices operates at 868.3 MHz. The CO2 Sensor requires a 230V mains supply; the RH sensor is battery powered; the 4-way switch uses a CR2032 cell (with a typical life up to 10 years). These details are stated in Nuaire’s installation manual for the ECO-3STOREY-HEAT.
To enter binding mode at the fan, power the unit, press the down button once to exit the start-up sequence, then press and hold both UP and DOWN for 20–30 seconds (around 25 seconds is optimal) until a single horizontal bar flashes. Press down again to start binding; the display will show a flashing “b” for the five-minute binding window. A solid “b” indicates an active boost command; a solid “P” indicates purge (full-speed).
To bind a Wireless Wall Switch (DRI-ECO-4S), put the fan into binding mode as above, then press and hold the appropriate buttons on the switch (on the 4-way: Boost and Heater off) for 2–5 seconds. The switch LED will flash green twice to confirm binding. You can test immediately by pressing Boost: a green LED confirms communication and the fan will run at maximum (purge) unless prevented by temperature standby. The 4-way switch can also toggle heater auto/on-off according to the manual.
To bind the RH Sensor or CO2 Sensor, first ensure the fan is in binding mode. Power the sensor (insert batteries for DRI-ECO-RH; connect 230 V to DRI-ECO-CO2), then use the sensor’s indented button sequence: tap once, then press and hold until the left LED flashes red/green, release while flashing, then tap again. Close the fan’s binding window by holding UP and DOWN for five seconds. Tap the sensor’s indented button to verify: a green left LED confirms a successful bind (repeat the steps if it shows red). When a sensor set point is exceeded the fan will increase by one speed step, and the diffuser display will show a solid “b” while the boost condition persists (if already on speed 6, sensor boost is ignored).
Placement and power notes drawn from the same source: mount the accessories in suitable indoor locations; the CO2 sensor must be on a 230 V supply; the RH sensor is battery-powered (2×AA); the 4-Way Switch may be surface-mounted with its fixing plate or adhesive pad. Always complete pairing first, then verify operation using the device button/LED indications and the diffuser display on the fan.
Explain to the household that the system supplies a gentle, filtered airflow at the head of the stairwell around the clock and will vary its behaviour with loft temperature if that profile is selected. When the loft is modestly warmer than the home, the fan may increase flow to capture that warmth; in very hot loft conditions it can pause to avoid introducing heat.
The heater tempers supply air only when the sensed outlet temperature is below the set-point, then modulates or switches off, so it does not run continuously. Everyday use is hands-off after commissioning, and the local isolator should remain on for continuous protection against condensation.
The filters are mounted on the outside of the unit for quick servicing. Inspect annually and replace at the recommended interval with Nuaire Drimaster Replacement Filters; a five-year service reminder is displayed on ECO models and can be cleared from the buttons after replacement.
While you are in the loft, check that the duct is not flattened and that the loft remains ventilated, tanks are lidded, and pipes are lagged.
If airflow feels weak, first check that the duct is not compressed or kinked and that all joints are airtight. Confirm the diffuser is correctly positioned with a clear ceiling path and that the speed setting is appropriate for the property; because of the fire-block diffuser, a higher step may be required.
If the unit does not run, check the local isolator, fused spur and power-supply module.
If the fan stops during an alarm, this is expected behaviour when the shut-down link is installed and it will resume once the alarm clears.
If a change-filter reminder persists after service, repeat the reset at the diffuser controls. For electrical or control issues, ask a qualified electrician to verify the supply and connections.
For the most effective whole-home moisture control, keep trickle vents open, avoid blocking the diffuser with fittings, and maintain a clear path for air down the stairwell. Use local extract fans in kitchens and bathrooms as normal; PIV complements rather than replaces local extract.
If the household size or moisture load increases, it is acceptable to raise the airflow by one step and review comfort over the next week or two. Record any changes so future maintenance teams understand the chosen settings.
A) The Nuaire Drimaster ECO-3STOREY-HEAT is a loft-mounted Positive Input Ventilation unit designed specifically for three-storey houses. It gently introduces filtered air from the loft into the top-floor landing through a special aluminium diffuser that contains an intumescent fire-block. By maintaining a slight positive pressure at the head of the stairwell, the system steadily dilutes moisture, odours and everyday indoor pollutants and encourages their displacement through leakage paths and existing extracts. Six selectable airflow steps (10–60 l/s) allow commissioning to suit property size. An integral, electronically controlled 400W heater tempers the supply air when the outlet sensor detects temperatures below your chosen set point (5–15°C), improving comfort in cooler months without compromising airflow. Intelligent loft-temperature logic boosts when the loft is usefully warm and pauses in very hot lofts to protect comfort and running costs. Commissioning and day-to-day adjustments are carried out from the Hall Control behind the diffuser, so there is no routine need to enter the loft.
A) The Nuaire Drimaster ECO-3STOREY-HEAT runs continuously at a gentle background rate, pushing clean, filtered air into the upper landing so it cascades down the stairwell and mixes with room air. This steady dilution keeps indoor humidity in check by offsetting moisture produced by bathing, cooking and occupancy. Lower humidity means fewer cold-surface condensation events on external walls, ceilings and window reveals, which in turn reduces the risk of black mould and damp odours. Because airflow is constant rather than intermittent, peaks in moisture are smoothed out between showering and cooking events. The tempered-air option prevents cool-feeling supply air in winter, encouraging occupants to leave the system running. Over time, the home stabilises to a drier, fresher state, with better protection for décor and building fabric. For best results, keep internal doors undercut or slightly ajar, continue using bathroom and kitchen extracts, and avoid obstructing the diffuser’s clear throw across the ceiling.
A) The Nuaire Drimaster ECO-3STOREY-HEAT is purpose-built for houses with three storeys and a usable loft, such as townhouses and larger family homes that include a storey more than 4.5m above ground level. These dwellings often suffer persistent upper-floor condensation because warm, moist air rises and cools against cold surfaces. Introducing filtered air at the top landing is particularly effective: the supply spreads along the ceiling and then descends the stairwell, reaching all floors as it diffuses. The model suits retrofit and refurbishment where a low-disruption, whole-home solution is preferred, and it is a strong choice for social-housing portfolios seeking predictable maintenance and a clear route to mould reduction. It is not suitable for flats without lofts or for properties requiring multiple supply points; in those cases, other strategies (for example, dMEV per room or MVHR) may be more appropriate. Where loft access exists and a single stairwell diffuser can serve the dwelling, ECO-3STOREY-HEAT is an efficient, compliant option.
A) Three-storey dwellings have additional fire-safety considerations. The Nuaire Drimaster ECO-3STOREY-HEAT addresses these by supplying a dedicated aluminium ceiling diffuser that contains an intumescent closure element. If significant heat rises from below, the intumescent material expands to seal the opening, helping to maintain the ceiling’s fire-resisting function between floors. The diffuser installs in a 200mm circular ceiling opening on the top-floor landing and must be used with this model; conventional plastic grilles are not appropriate for this application. Because the intumescent assembly adds airflow resistance, commissioning typically uses one speed step higher than an equivalent two-storey installation. The unit can also be hard-wired to smoke or carbon-monoxide alarms via relay bases so it automatically shuts down on an alarm condition, resuming normal operation once the alarm clears. Maintain at least 1m separation from nearby smoke alarms and orient the diffuser’s open faces to blow across unobstructed ceiling area to avoid nuisance interactions.
A) The ECO-3STOREY-HEAT places a 400W, electronically controlled heater between the fan and the diffuser. You set a supply-air temperature target between 5°C and 15°C from the Hall Control. An outlet sensor at the diffuser monitors actual temperature; when it falls below the set point, the heater modulates to temper the air, then scales back or switches off as soon as the target is met. This “on-demand top-up” avoids continuous running and preserves the core PIV function of moving adequate fresh air. Because the heater sits at the point of delivery, there are minimal distribution losses and the tempered air spreads evenly across the ceiling for comfort without draughts. The heater works alongside the loft-temperature logic: free solar warmth from the loft is captured by airflow boost where helpful, while hot-weather standby prevents introducing very warm loft air. The result is a consistent background supply with a gentle comfort lift in colder weather and minimal energy overhead.
A) The Nuaire Drimaster ECO-3STOREY-HEAT offers six airflow steps—10, 20, 30, 40, 50 and 60 l/s—selected from the Hall Control behind the diffuser to match property size and occupancy. Temperature logic profiles manage how the fan behaves: a normal profile maintains the set flow; Intelligent Heat Recovery boosts when the loft is modestly warmer than the home; hot-weather standby pauses airflow in very hot loft conditions; additional profiles allow constant-rate running or introduce a cold-weather standby band if preferred. For comfort, you set a 5–15°C supply-air target that governs the 400W heater. The system is RF-enabled and can accept wireless boost commands from an optional wall switch, a CO₂ sensor (mains powered) or a Relative Humidity sensor (battery powered). Boost on sensor demand typically increases the fan by one speed step; when the trigger clears, the unit reverts to the commissioned background rate automatically.
A) Background running costs are low. The fan alone typically draws between about 2W and 15W depending on speed, which, at typical UK unit rates, equates to roughly 1–10 pence per day for continuous operation. The integral 400W heater does not run continuously; it energises only when the outlet temperature is below your selected 5–15°C set point and then modulates or switches off as soon as the target is reached. As a practical guide at an average unit rate, around 30 minutes of heater use costs about 5 pence, one hour about 11 pence, two hours about 21 pence and four hours about 42 pence. In milder weather the heater may not operate at all, so the ultra-low fan demand dominates. In colder spells, short, intermittent heater bursts improve comfort without materially affecting overall household energy spend. Standing charges are separate and payable regardless of usage, and actual costs will scale with your tariff, fan speed and heater use.
A) The Nuaire Drimaster ECO-3STOREY-HEAT is designed for unobtrusive comfort. The diffuser’s geometry spreads air along the ceiling before it cascades down the stairwell, keeping local velocity low and the sensation of draughts minimal. The fan’s low-energy motor and short, uncompressed duct run help suppress noise, and continuous background operation avoids the “start/stop roar” associated with intermittent fans. During boost events, airflow rises by one or more steps, but the tempered-air option prevents cold-edge perception in winter. Correct installation is key: keep the flexible duct under 2m, avoid tight bends, make joints airtight and suspend or mount the unit with anti-vibration consideration. Maintain sensible separation from smoke alarms and avoid directing the diffuser’s open faces at obstacles, pendant lights or alarms. With these good practices, occupants usually report only a general sense of fresher air rather than noticeable sound or draughts.
A) Installation is typically quick and confined to the loft and top-floor landing. The installer cuts a 200mm circular opening in the landing ceiling and fits the supplied aluminium diffuser with its intumescent fire-block. In the loft, the fan/heater assembly is suspended from a sound roof timber (or fixed to a joist using an anti-vibration bracket) and connected to the diffuser via a short length of flexible duct—kept straight, round and airtight, with a recommended maximum of 2m. A pre-wired power-supply module is fixed to a suitable timber and connected via a fused spur and local two-pole isolator by a qualified electrician. Commissioning from the Hall Control sets the airflow step, temperature profile and 5–15°C heater target. Because all primary controls are at the diffuser, there is no routine need to re-enter the loft after installation. Internal finishes see minimal disturbance beyond the neat, circular diffuser opening.
A) Position the Nuaire Drimaster ECO-3STOREY-HEAT diffuser in the ceiling of the top-floor landing so air can travel across the underside of the ceiling and cascade down the stairwell. Keep well clear of pendant lights, bulkheads and decorative fittings that could disrupt the throw. Maintain at least 1m separation from any smoke alarm; if relocation is impractical, orient the diffuser’s open faces towards at least 1.5m of unobstructed ceiling away from the alarm. Ensure sufficient cavity depth above the ceiling for the diffuser spigot and the short duct to the fan without tight bends. Do not pack insulation tightly around the diffuser body; leave a slight clearance to avoid restricting the air path or conducting sound. Respect the manufacturer’s minimum wall clearances, which vary with final speed. Sensible placement ensures even mixing, avoids nuisance effects on alarms, and helps the unit deliver quiet, draught-free whole-home dilution.
A) A qualified electrician must complete the fixed wiring. The ECO-3STOREY-HEAT is supplied with a pre-wired power-supply module that mounts on a firm surface in the loft and connects via a suitably rated fused spur to a 230V~ supply; provide a local two-pole isolator for safe servicing. Dress the low-voltage output neatly to the fan, keeping it at least 50mm from other cables where practical for good EMC practice. In the loft, ensure safe access, secure boarding and good lighting; never step on unboarded plasterboard. Keep clear of hot flues and do not obstruct fire barriers. The three-storey model must use the supplied aluminium diffuser with its intumescent fire-block. Where smoke or CO alarms are fitted (recommended), wire the shut-down terminals to compatible relay bases so the fan stops automatically during an alarm condition. Always test the interlock using the alarm test button and record commissioning settings for future reference.
A) The ECO-3STOREY-HEAT is RF-enabled and supports one of each accessory type: a Wireless Wall Switch (DRI-ECO-4S), a Relative Humidity Sensor (DRI-ECO-RH) and a CO₂ Sensor (DRI-ECO-CO2). RF communication operates at 868.3MHz. Stand at the Hall Control, power the unit, press Down once to exit the start-up sequence, then press and hold Up and Down together for around 25 seconds until a single horizontal bar flashes. Press Down again to start the five-minute binding window (flashing “b”). For a wall switch, press and hold the indicated buttons (on the 4-way: Boost and Heater Off) for 2–5 seconds until the LED double-flashes green; test Boost to confirm the fan responds. For the RH or CO₂ sensor, power the device, use its recessed button sequence to transmit a bind request, and confirm success on both the sensor LED and the fan display. Close binding by holding Up and Down for five seconds, then prove operation.
A) Place sensors to sample representative room air in occupied zones. A CO₂ sensor should be mounted at typical breathing height in a frequently used space (for example a living room), away from open windows, cooker hoods, direct sunlight and heat sources that can bias readings. It requires a local 230V supply, so plan the spur and cabling with a qualified electrician. The RH sensor is battery-powered (typically 2×AA), giving placement flexibility; site it where it “sees” whole-house moisture behaviour—often a hallway or landing—not inside a bathroom, and not in the diffuser’s direct airstream. Avoid mounting either device directly on large metal surfaces that can attenuate radio signals. After pairing, use the device test function (where provided) or create a small, controlled stimulus to verify the fan boosts by one step and then returns to background once conditions fall back below the trigger threshold.
A) Maintenance is light and predictable. The external, push-fit filters protect the fan and the dwelling by capturing loft-borne dust and fibres; under normal conditions they typically require replacement about every five years. A service reminder appears on ECO models after five years and is cleared from the buttons once new filters are fitted. To replace, isolate power at the local spur, ensure safe loft access and secure boarding, release the retainers, withdraw the used elements, lightly dust the seating faces, fit the new pair squarely, re-engage the retainers and restore power. While in the loft, confirm the flexible duct remains under 2m, uncompressed and airtight at joints, and that the loft itself is ventilated with tanks lidded and pipes lagged. Keeping the diffuser face free from dust with a light vacuum during normal housekeeping helps maintain clean, even discharge across the ceiling.
A) A few rules ensure success. Always use the supplied aluminium diffuser with its intumescent fire-block—do not substitute a standard grille in a three-storey dwelling. Keep the duct as short, straight and round as possible (recommended maximum 2m) and avoid compressing it under insulation; make every joint airtight. Maintain at least 1m separation from smoke alarms and aim the diffuser across unobstructed ceiling space. Because the fire-block adds resistance, commission one speed step higher than you would for a two-storey home. Do not bury the fan in insulation or obstruct the diffuser with lampshades or decorations. Provide a modest undercut to internal doors or keep them slightly ajar so air can move down the stairwell and through rooms. When adding accessories, pair only one of each type, test immediately and record what has been linked. Following these fundamentals preserves quiet running, design airflow and comfort.
A) If airflow feels weak, first check that the flexible duct is not kinked, compressed or excessively long and that all ties and joints are airtight. Confirm the diffuser has the recommended clearances and that the speed setting is appropriate—and stepped up by one to account for the fire-block. If the unit pauses on very hot days, that is likely hot-weather standby; it will resume when conditions moderate. If the heater doesn’t seem to temper air, ensure Heater mode is enabled, the supply-air set point is sensible (5–15°C) and allow time for the outlet sensor to respond. If the fan does not run at all, verify the local isolator, fused spur and the power-supply module connections. For wireless accessories that don’t trigger boost, repeat the binding procedure close to the diffuser, replace batteries where applicable and re-test. After filter changes, clear any persistent reminder from the buttons and check for a gentle, even discharge at the diffuser.
A) The Nuaire Drimaster ECO-3STOREY-HEAT complements, rather than replaces, local extract in bathrooms and kitchens. The PIV provides the constant, filtered background ventilation that keeps humidity and pollutants low across the dwelling, while room-specific extractor fans deal with short-term peaks directly at source. Using both together is best practice: keep trickle vents open to provide make-up air paths, run bathroom and kitchen extracts during steamy activities, and let the ECO-3STOREY-HEAT maintain the steady baseline that prevents moisture build-up between events. The tempered-air feature makes continuous operation comfortable in winter, encouraging occupants to leave the system running. This combined approach is particularly effective in three-storey homes, where upper floors are otherwise prone to persistent condensation due to stratification and temperature gradients.
A) Start by selecting the operating profile that suits the household: Normal, Intelligent Heat Recovery, hot-weather standby, or constant-rate/cold-weather options. Choose the airflow step based on property size and moisture load—remember to increase by one step to offset the diffuser fire-block resistance. Set a sensible supply-air temperature target (5–15°C); many homes are comfortable around the middle of this band. Prove a gentle, even supply at the diffuser and quiet running in the loft, then demonstrate any paired accessories. Record all settings on handover. If occupancy rises or more laundry is dried indoors, it is acceptable to increase speed by one step and review comfort after a week or two. Encourage occupants to keep doors slightly ajar, leave trickle vents open and continue using local extracts. These simple practices, together with clean filters at the recommended interval, sustain performance with minimal energy use.
A) Both models share the same low-energy PIV principle, three-storey aluminium diffuser with intumescent fire-block, six airflow steps up to 60 l/s, temperature-responsive logic and external, long-life filters. The key difference is comfort tempering: the ECO-3STOREY-HEAT adds a 400W, electronically controlled heater governed by an outlet sensor and a user-set 5–15°C target. This enables the supply air to be gently warmed in colder weather, improving perceived comfort while preserving design airflow. The heated model also includes Hall Control adjustments for the heater set point alongside airflow and temperature profiles, and supports the same RF accessories (wireless switch, CO₂ and RH sensors) for demand-led boost. In practice, choose ECO-3STOREY-HEAT if you want the option to temper supply air at the diffuser; choose ECO-3STOREY where tempering is not required and you prefer the lowest possible electrical demand.
A) The Nuaire Drimaster ECO-3STOREY-HEAT is supplied with a five-year warranty that typically covers Parts & Labour in year one and Parts for years two to five. The warranty reflects the product’s robust build—high-efficiency motor, electronically controlled heater, Hall Control electronics and the dedicated aluminium diffuser with intumescent fire-block. As with most ventilation products, consumables such as filters are not covered beyond supply quality, and the warranty does not extend to faults caused by incorrect installation, misuse or non-genuine parts. Keeping a clear record of the installation date, commissioning settings, any paired accessories and filter-change dates supports future queries and speeds resolution should assistance be required. Nuaire’s established trade networks and documentation provide further guidance for installers and landlords managing multiple properties.
A) A few simple practices maximise performance. Keep internal doors slightly ajar or ensure modest undercuts so fresh air can move down the stairwell and through rooms. Do not obstruct the diffuser with light fittings or decorations, and maintain appropriate separation from smoke alarms. Continue to use kitchen and bathroom extract fans during steamy activities, and leave trickle vents open to support smooth air paths. Understand that in very hot spells the unit may pause in standby to avoid introducing warm loft air—this is normal. In winter, set a sensible supply-air temperature target so tempered air remains comfortable. Inspect filters annually and plan replacement at the recommended interval to preserve low resistance and quiet running. If household size or moisture load increases, raise the airflow by one step, then review comfort after a week or two and adjust if necessary. These habits keep the home consistently drier and fresher with minimal energy use.
Description
Installation
FAQ's
Data Sheets
