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Energy system boiler

ErP A rated system boiler with 7 years warranty*

  • High quality aluminium heat exchanger
  • FREE 7 year warranty* with option to extend
  • Compact size – fits perfectly in kitchen cupboards
  • ErP A rated for efficiency - helping to reduce energy bills
  • High Efficiency modulating Grundfos pump

With Energy, you’re not just delivering a boiler; you’re actually investing in a whole new connected way of working which is designed to make your life easier and your business more successful.

High efficient and high quality system boiler

The Energy system boiler is a high efficiency and high quality boiler that is designed using automotive grade aluminium. The Energy system boiler uses a heat exchanger that is high quality making it light to install.

The Energy system boiler has modern, high impact design which will suit your customers' homes and comes with a bright, easy-to-read, LCD display, a smart timeless case design and super quiet running.

Energy just requires simple water flush cleaning for the heat exchanger which means lower costs and no special cleaning tools. The patented 4 sided cooling reduces the stress on the heat exchanger which means longer term reliability for your customers. Energy is supported by UK wide spare parts availability.

Built in the UK and ErP A rated

The Energy system boiler is built right here in the UK and is ErP A rated. It comes with a great range of outputs, available in: 12, 15, 18, 25 or 30kW.

The Energy system boiler range is suitable for homes with high hot water demands and can be installed with Glow-worm’s range of cylinders for hot water storage.

Join Club Energy to enjoy the full benefits

Glow-worm’s Club Energy members earn rewards for their installations and can offer their customers’ up to 15 years of warranty. By using the industry leading installer app Plumbing Toolbox, Club Energy members complete the registration, warranty, Gas Safe notification and Benchmark on the go saving so much time. Find out more about Club Energy here.

*When registered through Club Energy

Features & benefits

  • Wide product range – caters for every heat output demand
  • Rear flue option gives flexibility
  • Aluminium heat exchanger – designed to be long lasting
  • High Efficiency modulating Grundfos pump lowers running costs as the pump adapts to actual heating and hot water demand
  • Modern, bright, LCD display giving excellent clarity of boiler information wherever it is installed making it easy to change and confirm settings



system boilers
Casing dimensions
(H x W x D)
mm700 x 390 x 280700 x 390 x 280700 x 390 x 280700 x 390 x 280700 x 390 x 280
Weight (lift)kg3131313232
CH output minimum/maximumkW4.5/12.34.5/15.25.0/18.36.1/25.47.2/30.5
Minimum operating pressure bar0.
SEDBUK SAP 2009 rating%89.489.489.489.489.3
ErP rating AAAAA
NOx class (natural gas) 55555
Heat exchanger materialAluminium/Stainless steelAluminiumAluminiumAluminiumAluminiumAluminium
Burner type Downward firingDownward firingDownward firingDownward firingDownward firing
Fully modulating YesYesYesYesYes
Suitable for sealed systems YesYesYesYesYes
Inbuilt condensate trap/siphon YesYesYesYesYes
Inbuilt frost protection YesYesYesYesYes
Zero compartment ventilation YesYesYesYesYes
Pump GrundfosGrundfosGrundfosGrundfosGrundfos
Bottom mm150150150150150
User interface
Diagnostics Advanced/IntuitiveAdvanced/IntuitiveAdvanced/IntuitiveAdvanced/IntuitiveAdvanced/Intuitive
User adjustable CH temperature control  YesYesYesYesYes
Optional spacing frame - 0020193660 YesYesYesYesYes
Plug in mechanical timer - 0020095196 OptionalOptionalOptionalOptionalOptional
Aesthetic pipe cover - 0020193659 YesYesYesYesYes
Optiflue compatible (PFGHRD) - 0020152034 N/AN/AN/AN/AN/A
Maximum horizontal Ø60/100m1010101010
Maximum vertical Ø60/100m1010101010
Maximum horizontal Ø80/125m2525252525
Maximum vertical Ø80/125m2525252525
Optional plume management kit Ø60/100 YesYesYesYesYes
Rear flue option Yes/NoYesYesYesYesYes

*See manual for clearance if side panels are to be removed to assist future service and maintenance

** 5mm if removable panel/door

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Alternative products

Alternative products

Ultimate₃ system boiler

Exclusive system boiler with 5 years warranty*

  • ErP A rated for efficiency - helping to reduce energy bills
  • FREE 5 year warranty with option to extend*
  • £15 reward when registered through Club Energy
  • Available as 25kW model