The Keston Heat 2 boiler is one of our market-leading solutions for challenging domestic and commercial installations. While a traditional boiler uses a concentric flue and must be housed on an external wall, the Heat 2 offers up to 18m* of twin flue capability, making it a flexible heating solution for a variety of problematic installations.Available in natural gas and LPG variants, this boiler has been engineered with carefully selected components to offer exceptional reliability and longevity. Designed to be straightforward to install and service, Heat 2 is a highly efficient condensing boiler with up to 110% part load efficiency to help reduce running costs.This room sealed, low NOx emissions appliance has been certified with a Class 6 rating, ensuring nitrogen oxides are not released during the heating process. This means cleaner emissions and cleaner air around your home, which contributes to improved overall air quality.