Solar Thermal Water Heating

Posted on November 17, 2008 by Joyce Benson   1 Comment |
Tag(s): Energy, Greening the Home, Greening the Office, Kitchens And Baths, Money Saving

Not only can the power of the sun supply electricity to your home or business, but it can also be harnessed to provide hot water. It is a cost-effective solution for hot water heating and will save you 50-80% on your water heating bills. There are two types of solar thermal water heating systems, active and passive. In this post I’ll concentrate on active systems which include insulated storage tanks, solar collectors, circulating pumps, and controls.

Here in my neck of the woods of southeastern Pennsylvania, an indirect circulation system is ideal since temperatures drop below freezing during the winter. Pumps circulate an antifreeze solution through the collectors and a heat exchanger. This heats the water that then flows into the home. In warmer climates, antifreeze is not needed obviously, so water is pumped through a direct circulation system and into the home.

A back-up system (a conventional storage water heater or tankless [on-demand] system) may be needed for cloudy days and times of increased demand.  ‘Solar storage tanks have an additional outlet and inlet connected to and from the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the solar storage in one tank.’

it is best to have a qualified, solar thermal systems contractor install your system. Solar water heating systems are typically low-maintenance, but as with any mechanical system, occasional routine maintenance should be done according to the manufacturer’s instructions.

Visit the U.S. Department of Energy’s website for more information and for help selecting the right solar water heating system for you.

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