August 31, 20205 yr Sounds like you may have lost primary fluid in your vacuum tubes. (Could be the leak that @svendescribed at the header tank with ball valve) This would lead to a major decrease in overall efficiency of the system. UberSolar seem to have a unique indirect water heater system with a venting setup on the manifolds to limit the maximum stagnation temperature to below boiling point. (94 degrees C for Johannesburg). I have never seen or heard of this system before so have no idea of how well it will perform. In this particular system the vacuum tubes is filled with fluid which is separated from the high pressure council supplied water. Traditionally the fluid in the indirect system would consist of a mixture of water and glycol and would be used in areas with frost. An expansion tank would allow for volumetric changes as the water / glycol mixture heats up and primary fluid should never be lost or vented out of the system. It should be a closed system. In this particular case it sounds like some of the primary fluid might have been lost. On the Gerserwise controllers i have only had good experiences so far.
September 1, 20205 yr On 2020/08/31 at 9:17 AM, Carl said: Sounds like you may have lost primary fluid in your vacuum tubes. (Could be the leak that @svendescribed at the header tank with ball valve) This would lead to a major decrease in overall efficiency of the system. Is there any way to test the vacuum tubes without opening up anything, using a meter such as a infrared scanner or similar type meter, would it be possible to pick up the faulty ev tube. How do the experts do this?
September 4, 20205 yr Author On 2020/08/31 at 9:17 AM, Carl said: primary fluid in your vacuum tubes Seems you could be right, if that is primary fluid and not the water in the pipes of the manifold
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