Among home that use a boiler to heat the home, there are those that use steam heat, and those that use hot water heat.
The two forms of heating are very different. The steam heat, is generated when water in the boiler reaches the boiling point. The released steam then flows through the closed loop heating the house and after circulating returns to the boiler. By necessity, the steam remains at a temperature at or slightly above the boiling point. Hot water, on the other hand, is heated to below the boiling point. It is driven through he closed loop via a pump, and it can be used at a variety of temperatures.
Because of the structural differences between hot water heating and steam heating, there are certain advantages and also disadvantages to using hot water heat. The advantages include the following.
1) Since the hot water heater runs at lower temperatures, it is more fuel conservative than steam boilers.
2) Since the temperature of the hot water is not fixed, the heat coming out of the radiators can vary depending on the need, which is not the case with the steam boiler. When the steam flows, it is coming out at boiling point, and is thus subject to the two extremes of too much heat when it is on at night, and too little heat, when the system is off.
3) Hot water boilers can be maintained on a low flame at night, as opposed to steam boilers which must be kept at a high flame to boil the water.
4) The hot water boiler is small and more durable than a steam boiler.
5) Because they run at lower temperatures, hot water boilers are considerably safer than steam boilers
Heating systems using hot water also have some disadvantages.
1) A direct hot water heating system, provides no ventilation.
2) Because the water temperature is lower than steam , the size of the radiator is proportionally larger.
3) There is a danger of the water in the hot water system freezing, although keeping the boiler on all night can prevent that.
4) A hot water boiler requires more fittings than a steam boiler, and thus more parts that can break. These breakable parts include: a flow check valve, a circulator, an expansion tank and most importantly, a pump.
5) Additional problems, that can occur with both hot water boilers, and steam boilers include: insufficient heating surface, insufficient boiler power, and imperfect circulation.
Thanks to A-1 Plumbing of Baltimore a Baltimore plumbing company for providing this information. The licensed plumbers at A-1 repair heating plumbing problems, so if you live in the Metro Baltimore, MD. area and need help with your hot water heating system
or your steam boiler system please contact A-1.
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