Radiator valves work by controlling the amount of hot water and steam that flow through the pipes of a hot water central heating system to each radiator in the system. They do this by means of plugs which stop the hot wa... More »

A thermostatic mixing valve mixes hot and cold water to make sure that what comes out of the shower or bath faucet does not scald the user. This tool not only helps to prevent burns, but it also prevents thermal shock, w... More »

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A thermal expansion valve in refrigeration or air conditioning systems uses a temperature sensing bulb to open a valve, allowing liquefied refrigerant to move from the high pressure side of the system to the low pressure... More »

A cast-iron radiator works by pushing hot water or steam through the pipes or fins, heating the surrounding air. Because warmer air is less dense, it rises away from the radiator. The colder air in the room then moves in... More »

A boiler heating system heats water and pushes either hot water or steam through a series of pipes and radiators to provide heat. Specifically, steam is distributed through pipes to the radiators, and hot water is distri... More »

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Maintain your hot water or steam radiators by adjusting the slope of the inlet pipe, checking the valves and vents for blockages and leaks, and releasing air from the system at the beginning of the heating season. Radiat... More »

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Under-floor heating involves either hot water pipes or electric heating elements placed underneath the floor of a room or an entire home, turning the floor into a radiant heater. These systems can be more energy efficien... More »

www.reference.com Home & Garden Heating & Cooling