Welcome to A1 Heating and Renewable Energy A1 Heating and Renewable Energy a trusted source of expert advice and installers of renewable heating solutions and central heating systems We also give you the peace of mind by offering a free 5 year manufacturer.s warranty on all installations of the UK.s leading boiler brands In addition, we offer full plumbing services, including installation of bathroom suites and kitchen appliances as well as basic plumbing jobs such as repairs to leaks and blocked drains