Sealed System Boilers - Unvented

The system boiler sometimes known as a “sealed system” provides central heating and hot water via a storage cylinder housed in an airing cupboard - no need for water tanks in the loft, as with a regular heat only boiler.

Energy System Boiler

A-Rated Glow-worm System Boiler

  • Wide range – available in 12, 15, 18, 25, 30kW
  • High quality aluminium heat exchanger
  • Compact size – even fits in kitchen cupboards
  • ErP A rated
  • High Efficiency modulating Grundfos pump

Ultimate2 System Boiler

Exclusive system boiler with 5 years warranty*

  • High performance, ERP A rated system boiler
  • FREE 5 year warranty* with option to extend*
  • £15 reward when registered through Club Energy
  • Available as 25kW model


Easicom system boiler – quality, reliability, choice

  • Available in 25kW output model
  • Bright LCD display with easy to use interface
  • Leading system boiler offering great performance
  • FREE 4 year warranty, when registered through Club Energy