<div dir="auto">And remember that ' the heat from the earth below ' is your friend.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 11, 2020, 8:54 AM Hilton Dier <<a href="mailto:hiltondier@gmail.com">hiltondier@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Daryl Thayer has the key to this: surface insulation. About 90% of heat loss from an open body of water is from evaporation. There are black plastic balls (about 5\u201d dia) you can get to float on top in a layer. Blue foam works but deteriorates in the sun. I know we are all about electrical and mechanical solutions on this list, but whatever you do, don\u2019t waste your money trying to heat an open surface water tank.<br>
<br>
Hilton Dier III<br>
Renewable Energy Design<br>
Missisquoi River Hydro LLC<br>
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