Thermosphere Electric Flow Boilers

£651.11£866.75 Incl. VAT

Free delivery over £150 (Exceptions Apply)
Next Day Available | 30 Day Return Policy
Further Delivery Information


Thermosphere Electric Flow Boilers are Environmentally friendly, compact and unobtrusive. The perfect water heating solution for homes without gas supply or where space is at a premium. Ideal for storage cupboards, extensions, loft conversions, conservatories and garages.

Our slimline electric flow boilers are fully compliant with EcoDesign directive 2009/125/EU & Commission Delegated Regulation (EU) 811/2013 so they can be installed with total confidence.


  • ‘Heating only’ hot water systems
  • Heating and hot water with an indirect cylinder
  • Wet underfloor heating


  • Controllable, efficient central heating
  • Integrated pump set and pressure release valve
  • No flue or fuel tanks means flexible installation
  • 99.8% efficient and EcoDesign Lot20 compliant
  • Compact and lightweight for easy installation
  • Minimal service and maintenance costs


Outputs range from 4.5kW to 9.0kW and each boiler features 3 heating elements that can be switched independently.
Three-phase 400V, 12Kw and 15Kw models also available to order

Thermosphere Electric Flow Boilers Technical data


Feature TSEB-0450 TSEB-0600 TSEB-0900
Max output (Kw) 4.5
(3 x 1.5 Kw)
(3 x 2.0 Kw)
(3 x 3.0 Kw)
Volume of heat exchanger (litres) 2.3 2.3 2.4
Voltage 230 230 230
Current (A) 21 27 40
Working pressue (MPa) 0.2 0.2 0.2
Working pressure (BAR) 2.0 2.0 2.0
Working pressue (PSI) 29 29 29
Max working Temperature (°C) 85 85 85
Cable section 230V (mm²) 1.5 2.5 2.5
Weight (Kg) 13 13 13
Dimensions (mm) 745 x 220 x 147 745 x 220 x 147 745 x 220 x 147
Noise level (dB) 49 49 49
Seasonal space heating efficiency (%) 36 36 36
Energy efficiency class D D D
ERP Lot20 Compliant Yes Yes Yes
Warranty duration 2 years 2 years 2 years
Max pressure 3 bar 3 bar 3 bar
ICE protection Class I Class I Class I
IP Rating IP22 IP22 IP22

Thermosphere Electric Flow Boilers Datasheets

Electric Boiler Datasheet


Thermosphere Electric Heat Boiler

Delivery Information

We have multiple delivery options

  • Next day carrier
  • 2-3 day carrier
  • Click & Collect from store


The cost of the carriage will be displayed before your final checkout. Free delivery is available on most items for orders over £150, exceptions do apply.


  • Orders will only be dispatched and delivered on weekdays.
  • Orders for the next working day delivery must be placed before 2 pm, this gives us time to pick and pack before the carrier arrives to collect.
  • We aim to dispatch all carrier delivered items within 48hrs, and all items delivered on our own transport within 5 days, Monday to Friday.
  • A dispatch email will be sent when your goods leave us, if delivery is by the carrier, this email will include tracking information. If your order is delayed for any reason, we will contact you.


We pride ourselves on our customer service but mistakes can happen. If you receive an incorrect or faulty item, please notify us within 30 days to arrange a refund, return or exchange.

Thermosphere Electric Heat Boiler