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Thermosyphon Solar Hot Water Heater question about Expansion Tank

Thermosyphon Solar Hot Water Heater question about Expansion Tank

Thermosyphon Solar Hot Water Heater question about Expansion Tank

(OP)
In a thermosyphon solar hot water heater, assuming there is a backflow preventor/check valve from the city supply, does it require an expansion tank or does the storage tank above the collectors act as a tank for some expansion as well?

Thanks

RE: Thermosyphon Solar Hot Water Heater question about Expansion Tank

No, you will require an expansion tank also.

Consider the effects to the panel and piping if you don't. Actually, the expanded water should weep out the PRV if you don't have an expansion tank....either that or it will cause pipe/joints to fail in the solar panel.

 

RE: Thermosyphon Solar Hot Water Heater question about Expansion Tank

(OP)
ok. does it matter where the tank is positioned?

1) between the backflow preventer (from city supply) and storage tank?

2) or between the storage tank and the solar collector?

RE: Thermosyphon Solar Hot Water Heater question about Expansion Tank

(OP)
On a side note, the storage tank has a pressure relief valve. does this not take care of the water expansion, therefore not needing an expansion tank?

RE: Thermosyphon Solar Hot Water Heater question about Expansion Tank

If you don't pump, any place on the system side of the back flow preventer should work. Locate the place of zero pressure change in the system and put it there.

RE: Thermosyphon Solar Hot Water Heater question about Expansion Tank

The PRV valve will sort of take care of the water expansion problem. The trouble is that the water expansion problem will happen every time water is heated, so you will be dripping water out all of the time.

Cedar Bluff Engineering
http://cedarbluffengineering.webs.com

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