If you have any specific recommendations for parts, please let me know.
I already have a 4'x10' flat plate collector.
I have concerns about mineral build-up in flat-plate heat exchangers. (I think they might require a second pump as well?) Also, I wouldn't be able to simply add in alternate heat sources like the wood stove. Additionally, the flat-plate heat exchanger has no solar storage capacity, I still need a separate storage tank.
On top of that, I don't have too much money to spend on projects like this. They need to save money in the long-run, but I am still looking at used/salvaged parts and DIY skills to save costs up front.
For pumps, I have considered the "El Sid", which is available in pump rates appropriate for a simple solar hot water system, and can be directly powered off a PV panel.
Thanks for the note on the "tall" water heaters - I hadn't heard of them before.
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