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boilerA hot water boiler is an appliance used to heat water for a hydronic heating system. The hot water is distributed through the home in pipes and radiates heat into the rooms with either a steel radiator (newer homes), cast iron radiator (older homes) or baseboard convectors or "fin-tube" (newer homes). boiler Hover over image to view full-size Once the radiator or baseboard fin-tube convector is heated with the hot water, the water is returned back to the boiler to be re-heated and the water circulation loop continues. In addition to radiators, the hot water boiler is also used with radiant floor heating systems.