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Message: <blockquote data-quote="guywhofishes" data-source="post: 333483" data-attributes="member: 337"><p>As hot water cools it gets heavier. A return line back to the water heater cools on the trip back.</p><p></p><p>I insulated the entire run except for last 10 ft of the return.</p><p></p><p></p><p>[ATTACH]51057[/ATTACH]</p><p></p><p>I returned with 3/4 to make damn sure it worked. </p><p></p><p>You must include a swing check valve mounted at about 45 degrees near the water heater return (spring valves are too strong). You have to have a check valve to prevent any cooler water from the bottom of your heater coming back in the return line to your faucet when you open it for hot water. You want the gentle force of the gravity flow to function - but water pressure demand to not backflow.</p><p></p><p>Also make sure there’s no heat trap fitting on your hot water nipple.</p><p></p><p>Glad I didn’t buy a pump. I might buy a timer valve to stop the circulation during the night when odds are low we’ll need quick hot water.</p><p></p><p><span style="color: silver"><span style="font-size: 9px">- - - Updated - - -</span></span></p><p></p><p>At 45 degrees the swing gate valve is actually hanging open - but slaps shut as soon as you open a hot water spigot.</p><p></p><p><span style="color: silver"><span style="font-size: 9px">- - - Updated - - -</span></span></p><p></p><p>It’s gonna take a while to get used to hot water in just 5 seconds at every location, not 90. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>

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