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Ritter Solar
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Ritter is concentrating on Commercial
But I'm extremely interested in their approach, and have been ranting about it and testing similar systems:
http://www.heatinghelp.com/forum-thread/141108/direct-system
They run water in the collector loop. The controller cycles the pump for 30 seconds every 30 minutes to see if freezing is imminent. If the collector is below 40F, then the pump keeps running until it comes back up to 50F. They are trying to prove that recirculation freeze protection is reliable enough for cold climates.
The collectors are U-tube style evacuated tubes.
Shipping costs make it tough to get one system, but they are happy to sell a pallet.
If you give me your email, I can forward more information.
Kevin 720 435-5909Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments0
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