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I built these for some single and two panel systems, short piping runs. The red one is a 4.4 gallon expansion tank, had a bad bladder. I perforated the failed bladder out with a long drill bit, and brazed some nipples in. This will replace a leaky tank at my house that was made from an old freon jug over 20 years ago. Pretty good service for a tank.
The yellow one is an 11 gallon, portable air tank. Harbor freight $36.95. I added the nipples and sight glass. A bit thicker walled tank, compared to the expansion tank.
Although expansion tanks are rated to 150 psi (before the modifications :) This will be a horizontal mount up in the ceiling joist.
I use water heater blankets from the box stores, two wraps around for a 2" fiberglass insulation with a white vinyl covering. Limits heat loss and quiets them down a bit.
A dash of glycol or some Rhomar inhibitor in the system helps protect ferrous metals.
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