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I have found that the best SDHW systems are ones that are PV powered (20w panel) and have no other controller to muck up (which is what has failed in 40% of the systems I see). They also are not SUPER efficient, generating high temps like a tube does. Doax made a system that I think could work well for many years. |
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I am considering Solar PV. Of course, we have a few issues there as well. Our roof ridgeline (simple pitched roof) runs North-South, so any solar panels would require racks for good solar alignment. We also have 3 mature trees on the west side of the house that provide good afternoon shading in the summer. I'm crossing my fingers that our city is able to work out a community solar PV garden. That would allow individuals to own PV with optimal siting and hopefully at a price discount. Tim |
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Anyone have experience with Heliatos Solar and their Solar Hot Water kits?
The GH Kits are advertised as freeze rated to -17°F, which should be plenty of range for our climate. I like the overall simplicity of the system, expandability, retrofit to any standard water heater and the price. This setup is appealing, but I assume there are drawbacks and issues I'm not familiar with. Thanks, Tim |
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That SDHW system you mentioned is kind of cobbled together. Not too professional.
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I say use a pv-t panel array running a drainback loop. You could rig the loop to a mini heat pump if you wanted to. Buy a long lasting water heater of whatever heat source you want. The pv-t panel array would pay for the whole rig eventually.
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Here are the results of our PVT design, done last year.
It is, in my opinion, good for pool heating but not quite so good for DHW although still a valid technology. The pic shows two identical panels, one with the grid PVT and the other just PV. |
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We sometimes run the pool pump at night through the panels to cool it down when it gets too hot but that is with plastic panels. Not sure how the PVT would work.
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