3 Counties Heating Ltd - Central Heating based in Harpenden and St. Albans, 3 Counties heating’s central heating engineers provide a professional and extensive heating installation and plumbing service. Our heating and plumbing services include full central heating installation, boiler replacement & update, boiler servicing & repair, boiler & heating service contracts, solar hot water heating systems & swimming pool boilers. All our central heating systems can be installed with a five year guarantee for your peace of mind. http://www.touchlocal.com/business/list/bid/6955162