The home uses a 4.2 KW Solar thermal system to provide
about 97 % of all hot water from April to November therefore the backup
oil furnace does not need to turn on. During late fall to
early spring the solar hot water panels provide preheated water for the
main hot water storage tank. The panels are very efficient and allow two
heating cycles during most days in the summer. Turning on the dishwasher
or washing clothes that require hot water at mid day allows for a second
heating cycle during the afternoon. This second cycle will insure extra
hot water for showers and other hot water needs during the evening.
Most dishwashers and cloths washers have a variable time delay timer for
time of use. Typically if there is more than two cloudy days the oil furnace will act
as a backup to heat the hot water. During the summer the panels generate
temperatures up to 300 F. In the winter on a sunny day, temperatures of
140 F at the panels are common. Solar thermal systems are among the most
efficient systems available. It is an excellent choice for a
young family on a limited budget to start with. The cost is roughly a
quarter of a solar electric system and at minimum 3 times more efficient
per unit area. On average payback is seven to eight years. Currently there
are no programs for renewable energy credits for small solar thermal
systems that I am aware of. Hopefully in the future this will change.
There are currently federal and state tax incentives available. (see the
links page for more info)
The three solar panels located at top of
the roof are solely used to heat hot water.
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Solar Hot Water Controller |
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