Original: $412.32
-65%$412.32
$144.31The Story
The Stiebel Eltron DEM 4 Set (product no. 236462) is a 4.4 kW mini instantaneous water heater occupying the mid-point in the DEM Set family, bridging the gap between the plug-in DEM 3 and the higher-output DEM 6. Like all DEM Set models it delivers hot water on demand to a single hand washbasin using full electronic closed-loop temperature control, with an outlet temperature sensor maintaining the set outlet temperature to within one degree — no cold-blending at the tap required. The DEM 4 Set requires a dedicated hardwired 20 A RCD-protected circuit and is equally suited to oversink and undersink mounting, compatible with both pressurised and non-pressurised taps. It is the preferred choice where the 3.5 kW DEM 3 Set provides insufficient thermal lift — for example in colder regions or locations with lower mains water temperatures — but where a full 25 A hardwired circuit for the DEM 6 is not available or practical.
Key Features
A dedicated outlet temperature sensor feeds real-time data to onboard control electronics, adjusting heating output continuously so the water exits at exactly the set temperature. There is no need to blend cold water at the tap — every litre drawn is at the correct temperature, eliminating the energy waste and frustration of manual adjustment common with basic instantaneous heaters.
With 4.4 kW at 230 V, the DEM 4 Set provides a meaningful temperature rise improvement over the 3.5 kW DEM 3. At a typical UK mains cold-water temperature of 10 °C and a minimum switch-on flow of >1.8 l/min, the extra kilowatt translates directly into a warmer, more comfortable handwashing experience — particularly important during winter months when mains temperatures drop.
The maintenance-free bare wire heating system transfers heat directly and instantly into the water stream, with no thermal mass to overcome — meaning hot water arrives immediately when the tap opens. The element is suitable for hard and soft water alike, with open-wound construction that resists the scale build-up that can reduce efficiency and lifespan in sheathed elements.
Two complementary safeguards work in tandem: automatic output matching reduces heating power proportionally if the inlet water temperature rises unexpectedly, keeping outlet temperature within safe limits; and a fixed internal temperature limit (set by a qualified contractor) provides a permanent backstop that the user cannot accidentally override.
The back panel doubles as a precision drill template, with elongated slots to tolerate imprecise drill holes — reducing installation time considerably. Two-point wall fixing secures the unit. The cover and internal assembly detach with a single hand movement, giving unrestricted access during commissioning and service. External metal G 3/8 A water fittings allow direct universal tap connection without additional adaptors.
Rotating the appliance 180° reconfigures it between oversink and undersink orientations without component changes. Water connections and cable routing are designed to suit either position, giving full flexibility to work around existing pipework, tile layouts, or under-sink cabinetry.
An integral variable flow-rate limiter and special aerator are included to ensure consistent performance with both open-outlet non-pressurised taps and standard pressurised taps. The aerator delivers an optimised flow pattern at the spout across the full range of mains supply pressures.
A built-in three-LED diagnostic indicator provides at-a-glance fault analysis during commissioning and service visits, enabling rapid identification of electrical, water-flow, and control faults without specialist diagnostic tools.
By heating water directly at the draw-off point and only when the tap is open, the DEM 4 Set eliminates the standing heat loss and dead-leg pipe-run waste inherent in cylinder-fed or central instantaneous systems. Energy is consumed only for the water actually used, making it highly efficient in intermittent or low-frequency-use applications such as staff cloakrooms, school washrooms, and commercial premises.
Technical Specification
| Identification | |
|---|---|
| Product Number | 236462 |
| Model | DEM 4 Set |
| Electrical | |
| Rated Voltage | 230 V (1/N/PE) |
| Rated Output at 230 V | 4.4 kW |
| Rated Output at 200 V | 3.3 kW |
| Rated Output at 220 V | 4.0 kW |
| Rated Output at 240 V | 4.8 kW |
| Rated Current at 230 V | 19.1 A |
| Rated Current at 200 V | 16.7 A |
| Rated Current at 220 V | 18.2 A |
| Rated Current at 240 V | 20.0 A |
| Circuit Fuse (all voltages) | 20 A |
| Frequency | 50 / 60 Hz |
| Connection | 1/N/PE — hardwired; 20 A DP isolator required; cable to BS 7671 |
| Water | |
| Water Connection | G 3/8 A (external metal fittings) |
| Switch-On Flow Rate | > 1.8 l/min |
| Water Resistivity ρ₁₅ ≥ (inlet ≤ 25 °C) | 1000 Ω·cm (conductivity ≤ 1000 µS/cm) |
| Water Resistivity ρ₁₅ ≥ (inlet > 25 °C) | 1300 Ω·cm (conductivity ≤ 770 µS/cm) |
| Performance | |
| Outlet Temperature Range | 30–50 °C (user-adjustable) |
| Internal Anti-Scalding Limit | Fixed — qualified contractor only |
| Control Method | Electronic closed-loop (outlet sensor) |
| Shower Suitability | Not rated for shower use |
| Physical | |
| Height | 143 mm |
| Width | 190 mm |
| Depth | 82 mm |
| Weight | 1.70 kg |
| Colour | White |
| IP Rating | IP25 (splash-proof) |
Frequently Asked Questions
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The Stiebel Eltron DEM 4 Set (product no. 236462) is a 4.4 kW mini instantaneous water heater occupying the mid-point in the DEM Set family, bridging the gap between the plug-in DEM 3 and the higher-output DEM 6. Like all DEM Set models it delivers hot water on demand to a single hand washbasin using full electronic closed-loop temperature control, with an outlet temperature sensor maintaining the set outlet temperature to within one degree — no cold-blending at the tap required. The DEM 4 Set requires a dedicated hardwired 20 A RCD-protected circuit and is equally suited to oversink and undersink mounting, compatible with both pressurised and non-pressurised taps. It is the preferred choice where the 3.5 kW DEM 3 Set provides insufficient thermal lift — for example in colder regions or locations with lower mains water temperatures — but where a full 25 A hardwired circuit for the DEM 6 is not available or practical.
Key Features
A dedicated outlet temperature sensor feeds real-time data to onboard control electronics, adjusting heating output continuously so the water exits at exactly the set temperature. There is no need to blend cold water at the tap — every litre drawn is at the correct temperature, eliminating the energy waste and frustration of manual adjustment common with basic instantaneous heaters.
With 4.4 kW at 230 V, the DEM 4 Set provides a meaningful temperature rise improvement over the 3.5 kW DEM 3. At a typical UK mains cold-water temperature of 10 °C and a minimum switch-on flow of >1.8 l/min, the extra kilowatt translates directly into a warmer, more comfortable handwashing experience — particularly important during winter months when mains temperatures drop.
The maintenance-free bare wire heating system transfers heat directly and instantly into the water stream, with no thermal mass to overcome — meaning hot water arrives immediately when the tap opens. The element is suitable for hard and soft water alike, with open-wound construction that resists the scale build-up that can reduce efficiency and lifespan in sheathed elements.
Two complementary safeguards work in tandem: automatic output matching reduces heating power proportionally if the inlet water temperature rises unexpectedly, keeping outlet temperature within safe limits; and a fixed internal temperature limit (set by a qualified contractor) provides a permanent backstop that the user cannot accidentally override.
The back panel doubles as a precision drill template, with elongated slots to tolerate imprecise drill holes — reducing installation time considerably. Two-point wall fixing secures the unit. The cover and internal assembly detach with a single hand movement, giving unrestricted access during commissioning and service. External metal G 3/8 A water fittings allow direct universal tap connection without additional adaptors.
Rotating the appliance 180° reconfigures it between oversink and undersink orientations without component changes. Water connections and cable routing are designed to suit either position, giving full flexibility to work around existing pipework, tile layouts, or under-sink cabinetry.
An integral variable flow-rate limiter and special aerator are included to ensure consistent performance with both open-outlet non-pressurised taps and standard pressurised taps. The aerator delivers an optimised flow pattern at the spout across the full range of mains supply pressures.
A built-in three-LED diagnostic indicator provides at-a-glance fault analysis during commissioning and service visits, enabling rapid identification of electrical, water-flow, and control faults without specialist diagnostic tools.
By heating water directly at the draw-off point and only when the tap is open, the DEM 4 Set eliminates the standing heat loss and dead-leg pipe-run waste inherent in cylinder-fed or central instantaneous systems. Energy is consumed only for the water actually used, making it highly efficient in intermittent or low-frequency-use applications such as staff cloakrooms, school washrooms, and commercial premises.
Technical Specification
| Identification | |
|---|---|
| Product Number | 236462 |
| Model | DEM 4 Set |
| Electrical | |
| Rated Voltage | 230 V (1/N/PE) |
| Rated Output at 230 V | 4.4 kW |
| Rated Output at 200 V | 3.3 kW |
| Rated Output at 220 V | 4.0 kW |
| Rated Output at 240 V | 4.8 kW |
| Rated Current at 230 V | 19.1 A |
| Rated Current at 200 V | 16.7 A |
| Rated Current at 220 V | 18.2 A |
| Rated Current at 240 V | 20.0 A |
| Circuit Fuse (all voltages) | 20 A |
| Frequency | 50 / 60 Hz |
| Connection | 1/N/PE — hardwired; 20 A DP isolator required; cable to BS 7671 |
| Water | |
| Water Connection | G 3/8 A (external metal fittings) |
| Switch-On Flow Rate | > 1.8 l/min |
| Water Resistivity ρ₁₅ ≥ (inlet ≤ 25 °C) | 1000 Ω·cm (conductivity ≤ 1000 µS/cm) |
| Water Resistivity ρ₁₅ ≥ (inlet > 25 °C) | 1300 Ω·cm (conductivity ≤ 770 µS/cm) |
| Performance | |
| Outlet Temperature Range | 30–50 °C (user-adjustable) |
| Internal Anti-Scalding Limit | Fixed — qualified contractor only |
| Control Method | Electronic closed-loop (outlet sensor) |
| Shower Suitability | Not rated for shower use |
| Physical | |
| Height | 143 mm |
| Width | 190 mm |
| Depth | 82 mm |
| Weight | 1.70 kg |
| Colour | White |
| IP Rating | IP25 (splash-proof) |
Frequently Asked Questions
