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Old 09-14-20, 04:50 PM   #2
SDMCF
Apprentice EcoRenovator
 
Join Date: Jul 2014
Location: Finland
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Quote:
Originally Posted by osolemio View Post
The point is - how much can you get on a cold and overcast day?
I have 90 tubes and they perform very well on cold days but do not perform at all well on overcast days. The most productive time of year for me is February/March when the temperature can be -30C but the air is clear and the snow on the ground reflects extra light onto the tubes.

Quote:
Again, my main question is about drain-back and evacuated tubes - can I rely on the liquid section of the evacuated tubes manifold to drain properly?
My system uses antifreeze and I have no experience of drainback systems but I will comment anyway. The water flowing through the manifold is effectively just flowing through a pipe (22mm copper on my manifolds). So long as that pipe is angled so the water will drain back under gravity I don't see a problem.
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