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Message: <blockquote data-quote="geezer77" data-source="post: 4342435" data-attributes="member: 49872"><p>Well, I was just brainstorming, but 1" ID plastic pipe will hold a little more than a gallon per 10 feet. So a 50' loop should provide at least 5 gallons of preheated water heater input during most daylight hours in warm months. You'd still have to power the WH coils, but at least you won't be flooding the tank with cold water on the feed side every time some hot is drawn. Could shirt tail engineer a lightweight black plastic pipe loop mounted on a single 4x8 sheet of exterior plywood lag-screwed through the shingles into the roof decking. Weather/hail proof, no maintenance involved, no moving parts, no electricity, no valves except for a bypass. I'll admit it wouldn't be pretty, though. <img src="/images/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" /></p></blockquote><p></p>