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A 1,000-gallon tank
sits in the basement. It stores solar-heated water. It serves several
functions. It preheats water for the water heater to bring up to higher
temperature if needed.
It also provides storage
for water heated by the solar panels on the roof. The water acts as the
thermal mass of the house and is one of the best ways for storing heat,
and unlike concrete or stone, it's easily portable.
The tank has five
inches of foam insulation. And with the ladder leading inside, it can
double as a hot tub (just kidding).
There are six 4x8-foot
solar-thermal panels on the roof to heat both the house and water it uses.
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