The Glow-worm Energy7 35C Vertical Flue combi boiler is a popular option for use in medium to large-sized properties, such as those with 3 or more bedrooms and 2 bathrooms. It features a central heating output of 35 kW and a hot water flow rate of 10.4 litres per minute. This boiler is designed for efficiency and reliability, making it a suitable choice for modern homes. The unit is compact and easy to install, with user-friendly controls for convenient operation.