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Old 11-16-2006, 09:02 AM   #1
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Gravity hot water loop for instant hot water at tap


Was reading an old thread and I have an additional question. I installed a gravity loop with a check valve in the basement of my house and the far end at the furthest tap. It does not appear to be working and I was wondering if I should install an inline pump and put it on a timer or is there a pressure sensing differental pump that could be installed. It would come on when a hot tap is turned on anywhere in the house which would place hot water out to the furthest tap????? Am I thinking correct and if so what pump or pumps could be used and what would the costs be?

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Old 11-16-2006, 05:50 PM   #2
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Gravity hot water loop for instant hot water at tap


What you need is a circulating pump. This keeps hot water flowing through the line at all times. Another option is a pump that has a demand switch. When you need hot water, you hit the switch and the pump kicks on and circulates the hot water. This idea keeps from having a pump running all the time.

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Old 11-17-2006, 09:03 AM   #3
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Gravity hot water loop for instant hot water at tap


Have you put pipe insulation on the pipe?
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Old 11-17-2006, 10:08 AM   #4
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Gravity hot water loop for instant hot water at tap


Which line needs to be insulated? the return loop or the main line?
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Old 11-17-2006, 05:59 PM   #5
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Gravity hot water loop for instant hot water at tap


Insulating any hot water line that is circulating water will save energy and money. The line going back to the water heater causes the temperature in the tank to drop and force the heating source (electric/gas) to energize to maintain the preset temperature of the unit.
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