Heat Only Boilers

Glow-worm’s exceptional heat-only boilers (also known as ‘open-vent’ boilers) provide central heating and hot water via a winning combination of a boiler, a storage cylinder and water tanks. As well as providing ultra-efficient system and combi boiler solutions, Glow-worm also specialises in manufacturing award-winning heat-only boilers.Our online store offers a number of high-efficiency heat-only boilers, specifically designed to be durable and easy to use. *Note: All extended warranties stated are only available, when registered by a Club Energy installer.

Energy Regular Boiler

A Rated Compact Regular Boiler

  • ErP A rated
  • High efficiency – low running costs
  • Eligible for up to 15 years of warranty*
  • Compact size – perfect in kitchen cupboards
  • Ultra quiet

Ultimate2 Regular (open vent) Boiler

High efficiency regular boiler from Glow-worm

  • High performance, ERP A rated regular boiler
  • £15 reward when registered through Club Energy
  • Lightweight boiler with cupboard fit dimensions
  • FREE 5 year warranty* with option to extend*


Easicom regular boiler - quality, reliability, choice

  • A-rated regular boiler for efficiency – helping to lower your running costs
  • 4 years FREE parts and labour warranty, when registered through Club Energy
  • Manufactured in the UK by Glow-worm, the brand you can trust
  • Reliable performance
  • Competitively priced