Rated at 5kW it can heat a decent sized room easily, with easy variable output between 1.5 and 5kW. It’s viewing window is huge for a compact stove! ‘Peanut-5’ – can fit a ‘standard small’ UK chimney opening of 16” wide. – This can make some installations so much simpler and easier – rarely would any building/ alteration work need to be done even with a small chimney opening. Normally for houses built prior to 2008, an additional air vent in the room is NOT required.