Specific or complex project ahead? Get in touch for a free, fast quote.
Stiebel Eltron DHB-E 27kW 3-Phase Water Heater | 203865
Regular price
£630.00
Inc. VAT
£525.00
Exc. VAT
FREE Express Delivery (1-3 days) in UK Mainland on most orders*
Excluding: Solar Panels (£170 delivery / free above £2,500), Batteries (£39 delivery), Small Items (£4.95/5.95 delivery / free above £500)
Contact Us to check for Next Working Day Delivery or Same-day Delivery options
Contact Us for Click & Collect options
Custom quote available on request
*See checkout or shipping policy for full details
Payment options
Tools & Kits
Build your kit
Need a full system?
Design your complete solution in minutes with our kit builders.
Do you have a question
about this product?
One of our expert advisors will be happy to help you!
Contact Us
The Stiebel Eltron DHB-E 27 LCD (part no. 203865) is a 27 kW three-phase instantaneous water heater from the DHB-E LCD comfort range. It heats water only as it flows, so there is no cylinder, no standing heat loss and no waiting for a tank to recharge. Electronic 3i technology uses three sensors and closed-loop control to hold the outlet temperature steady right up to the appliance's output limit, so a shower does not swing hot and cold when someone opens a second tap.
Set the temperature on the rotary selector from 20 to 60 °C in 1 °C steps and read it on the LCD. The cover and programming unit can be pivoted for undersink installation, and the compact 466 x 225 x 116 mm body suits both undersink and oversink positions. It can also reheat preheated water from solar thermal or heat pump systems up to 55 °C, which makes it a practical top-up heater alongside renewables.
This is the fixed 27 kW model: 400 V, 3/PE, 39 A with a 40 A fuse. It is the right choice where a three-phase supply is available and you want the highest output in the DHB-E LCD range for showers, kitchens and several draw-off points.
27 kW
Fixed rated output
400 V 3/PE
Three-phase supply
39 A / 40 A
Rated current / fuse
20–60 °C
Rotary + LCD control
IP25
Hoseproof
Class A
ErP energy class
Safety and regulatory
Installation, commissioning and maintenance must be carried out by a qualified contractor. The heater must be permanently connected to fixed wiring, earthed, and fed through an all-pole isolator with at least 3 mm contact separation. Electrical work must comply with BS 7671 and Part P. The manufacturer advises notifying the electricity and water utilities before installing. Outlet water can reach up to 70 °C, and there is a scalding risk above 43 °C. For shower use the internal anti-scalding limit must be set to 55 °C or less.
Compatibility
Requires a three-phase 400 V supply capable of carrying the load; the maximum permissible mains impedance is 0.21 Ω at 400 V. Water supply must be mains pressure up to 10 bar (1 MPa) with pressure-type taps (open-vented taps are not permitted), and the water must have a specific resistivity of 900 Ω cm or higher at 15 °C. The 27 kW is a fixed-output model; if you need to choose the output, see the selectable 18/21/24 kW version.
Key features
3i electronic control
Three sensors and closed-loop output control deliver a consistent, accurate outlet temperature up to the appliance's maximum output.
LCD and rotary selector
Rotary selector with no end stop, 1 °C steps from 20 to 60 °C, a clear LCD temperature display and a user-selectable °C / °F unit.
Solar and heat pump ready
Reheats preheated water up to 55 °C; maximum inlet temperature 70 °C (for example pasteurisation cycles, no reheating).
Built-in safety
Adjustable internal anti-scalding limit (43, 50, 55 or 60 °C), a high-limit safety cut-out and an air detector that pauses heating for one minute to protect the element.
Bare-wire heating system
A bare-wire heating system in a pressure-tested plastic jacket gives fast heat-up and is suited to hard and soft water areas.
Quick, flexible install
Undersink or oversink, pivoting cover, selectable cable entry from above or below, and a supplied wall bracket, template, 3-way ball valve, strainer and flow limiter.
Specification
Hot water output at 400 V
Output depends on the supply voltage, the connected load and the cold water inlet temperature. Figures are litres per minute of hot water at 27 kW and 400 V.
Flow limiter note
These are heating-capacity figures. The 8.5 l/min flow limiter supplied fitted caps the flow through the appliance. If the 2.5 l/min switch-on flow cannot be reached even at higher pressure, the limiter can be swapped for the plastic profile washer, but keep the flow limiter fitted when using a thermostatic valve.
Installation notes for the trade
First start-up
The appliance ships with the safety switch disabled: press the reset button firmly at commissioning. Purge all air by opening and closing every draw-off point for at least 60 seconds before switching the power on, and repeat the venting step after any interruption to the water supply. Clean the supplied strainer if flow drops, as it must stay fitted for the appliance to function.
Accessories (available from the manufacturer)
LR 1-A load shedding relay for priority control alongside other electric loads, ZTA 3/4 central thermostatic valve for preheated-water systems, a wireless remote control, pressure taps, and installation sets for finished walls, undersink pipework and appliance replacement.
Frequently asked questions
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
Tools & Kits
Build your kit
Need a full system?
Design your complete solution in minutes with our kit builders.
Do you have a question
about this product?
One of our expert advisors will be happy to help you!
Contact Us