Has anyone used or known of the vacuum solarhot waterheaters where there is a hot water tank at the top of an array of vacuum tubes with a non-freezing fluid like this picture?
I have no experience with it but I *think* this is the type of solar hot water heater Geoff Lawton is going to install at his Jordan site in the near future. Are there other variations of a vacuum tube solar water heater? He said something about the system being very affordable especially when compared to traditional "panel on the roof, tank in the house" solar water heaters.
Subtropical desert (Köppen: BWh)
Elevation: 1090 ft Annual rainfall: 7"
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