Licensing, trading standards, business rates, property & land, support. Already registered? log in with. A hot water boiler heater is an appliance used heat your home with hot water it distributes hot water through your home in pipes and radiators and baseboards the water circulates back and forth from the radiators and baseboards to the boiler heater in a. If your property was built after 30 october 1937, the drains serving your property are your responsibility but the.