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01-17-2007, 07:41 AM   #1
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## Gravity Hot Water Recirculating Loop Questions

So I have to wait too long for hot water. I've been looking at recirculating pumps, various brands, various methods. Read and article about gravity hot water recir. loops. I understand the theory, but am wondering if two loops can work.

Cliffs on info:

You run a return hot water line from furthest fixture. You plumb it into the hot water heater's drain spigot. You remove any backflow preventer on the hot water supply side. Thermal properties of heated water take over and hot water rises out of HW heater and the cooler water in the return lines "sinks" into the bottom of your water heater. This slow circular motion keeps hot water available at furthest point. You must insulate the lines, except for last 15ft of return.

So my water lines look like the below diagram, but I would like Hot water at both ends of the line, and am wondering if two loops would work, and if so how to plumbe them correctly.

01-17-2007, 08:37 AM   #2
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So I found another article...
http://www.contractormag.com/article...fm?columnid=62

Main thing I picked up on is it states I should add the volume of water now contained in the loop to my calculation for the expansion tank size....

So for me one loop of 100' of 3/4 would be approx....5 gallons.....

 02-06-2007, 03:28 PM #3 Member   Join Date: Mar 2006 Posts: 2,083 Rewards Points: 1,000 There are different models but they do the same thing. It pumps the water back into the cold water supply line until there is hot water at the fixture. http://www.costco.com/Browse/Product...&Mo=11&topnav=

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