Glow-worm is a foundation of the UK energy industry, having originally begun producing boilers back in 1934 at the Derwent Foundry in Derbyshire. For the past 75 years, our entire drive has been focussed towards offering you, our customers, reliable and highly efficient products. It’s this drive which has led us right to the top as one of the leading heating manufacturers in the UK. Products We pride ourselves in offering exceptional and durable energy solutions, manufacturing all our boilers and renewables at our state of the art production facilities in Belper, Derbyshire. Our revered range of products includes domestic gas boilers, such as combi, system and heat only options, and renewable technologies such as heat pumps, solar and hot water cylinders.