The Glow-worm Energy 25kW regular heat-only boiler delivers robust, highly efficient central heating for properties with demanding hot water requirements. Operating on natural gas, this open vent boiler provides a central heating output of 26.5kW (90,000 BTU) and requires pairing with a separate hot water storage cylinder and cold water feed tank. At the core of the unit lies a premium automotive-grade aluminium heat exchanger, engineered to ensure rapid heat transfer while keeping the total operational weight down to an easily manageable 22.2kg.

Designed with a highly compact footprint measuring 600mm by 375mm by 280mm, the boiler is perfectly proportioned for discreet installation within standard kitchen cupboards. The system boasts an ErP A-rating for heating efficiency, drastically reducing ongoing fuel consumption for the end user. To facilitate flexible routing during complex retrofit projects, the boiler supports both top and rear concentric flue configurations. The front fascia incorporates a bright, intuitive LCD interface that simplifies commissioning and diagnostic readouts for the heating engineer.

Q: What type of heat exchanger does this regular boiler utilise?
A: It features a lightweight, automotive-grade aluminium heat exchanger for rapid thermal transfer.

Q: Can the flue be routed directly through the wall behind the boiler?
A: Yes, the unit is rear-flue ready, offering both top and rear concentric flue configurations.

Q: Is this boiler suitable for a sealed, unvented central heating system?
A: No, this is an open vent regular boiler designed to work alongside a cylinder and header tank.

Q: What are the physical dimensions of the external casing?
A: The boiler features a compact footprint measuring 600mm in height, 375mm in width, and 280mm in depth.