The Glow-worm Ultimate3 regular boiler is designed for open-vented systems, making it ideal for homes with significant hot water needs. This 25 kW model boasts flexible flue arrangements and an aluminium heat exchanger, ensuring dependable performance and reliability. It features a contemporary LCD screen with an intuitive interface. A standard 5-year warranty is provided, which can be extended to 10 years by using a Glow-worm power filter and registering via Club Energy. This boiler is also ErP A-rated at 94% efficiency, contributing to lower energy expenses. Its design is lightweight and compact, fitting within standard cupboards, and it includes a high-efficiency, modulating Grundfos pump that adjusts to meet the actual heating and hot water requirements, further reducing running costs. The installation and servicing process is straightforward, and a comprehensive selection of Glow-worm flues and accessories is available.