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Xringer · 07-15-11, 07:52 AM

Drain back system, that could use water in the loop.

Solar Heating - DHW | Colorado Solar Energy Industries Association

My Glycol system looked like this. The Expansion tank prevented any high pressure from building up.

My pre-heater tank was 84 gallons, and my standard water heater was my 76 gallon HS Tarm oil burning boiler..

My system worked great for years, but town water is very hard on metal.
First, the 84 gallon tank started leaking at the un-used heating elements,
not too hard to repair, then my heat exchanger started leaking at the clean-out gasket.
Sadly, the bolts wouldn't come out after the water did it's work..

Home heating oil was dirt cheap and my wife hated those panels on the roof..
The system had paid for itself.. So I took it down.. Wish I hadn't..

07-15-11, 07:52 AM	#9
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Drain back system, that could use water in the loop. Solar Heating - DHW \| Colorado Solar Energy Industries Association My Glycol system looked like this. The Expansion tank prevented any high pressure from building up. My pre-heater tank was 84 gallons, and my standard water heater was my 76 gallon HS Tarm oil burning boiler.. My system worked great for years, but town water is very hard on metal. First, the 84 gallon tank started leaking at the un-used heating elements, not too hard to repair, then my heat exchanger started leaking at the clean-out gasket. Sadly, the bolts wouldn't come out after the water did it's work.. Home heating oil was dirt cheap and my wife hated those panels on the roof.. The system had paid for itself.. So I took it down.. Wish I hadn't..