Russell B. Bleakley Plumbing & Heating, Inc.

Heating Question and Answers

Hydro Heating Questions

With domestic hot-water or hydronic heat, supply and return issues center on water and the pipes that carry it. With hydronic heat, the boiler fires and heats the water to an average temperature of 180°F to 200°F for baseboard heat and 80°F to 85°F for radiant floors. This hot water is pushed through copper or PEX tubing via a circulator or pump. As it travels through the house, heat is either transferred to slats or "fins" located along the pipes in baseboard registers or transferred directly to a wall panel, the floor or ceiling. Return water re-enters the boiler at a temperature of 110°F and is carried either through its own return pipe or through a series of registers culminating at the boiler.

In a hydronic system, heating by room is controlled via thermostats and zone valves installed on the supply pipe to encourage or prevent hot water from entering a given loop. Some systems have individual circulators for each zone, sending hot water to that baseboard or heating zone only when called for by the thermostat.

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