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Old 01-09-2012, 07:50 PM   #1
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Advice on plumbing two water heaters in series


Hello,

My current house is approximately one story, 3000 sq feet and all electric.

We have two waters heaters supplying the house. One is in the laundry room on one side of the house and supplies the kitchen, laundry room and a bathroom.

The other water heater is approx 60 feet away and supplies two bathrooms.

I was planning on purchasing a heat pump water heater and installing it it he laundry room. I was then going to run a line from the hot water outlet off the heat pump and have it feed the cold water inlet on the existing water heater on the other side of the house.

I'm looking for ways to cut the current electricity usage. Has anyone done something like this?

Thanks,

Todd

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Old 01-09-2012, 08:05 PM   #2
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Advice on plumbing two water heaters in series


It would make no since to do that. All the other heater would do then is act as a storage tank for hot water.
If you were to just have one heater the proper size you could add a cirulating pump so you would have almost instant hot water in the rooms 50 ft. away.

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Old 01-09-2012, 08:55 PM   #3
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Advice on plumbing two water heaters in series


Thanks, I have heard that too. But, do you have to wait for the water to cool down since there is hot water circulating back through the cold water return line?
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Old 01-09-2012, 09:21 PM   #4
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Advice on plumbing two water heaters in series


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Thanks, I have heard that too. But, do you have to wait for the water to cool down since there is hot water circulating back through the cold water return line?
Think about what you just asked. Basically, you proposed to do just this with your first proposal- putting hot water into another tank.
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Old 01-09-2012, 09:39 PM   #5
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Advice on plumbing two water heaters in series


Maybe I'll hire a plumber. I don't see how using a heat pump water heater to pre-heat the water going into a secondary tank would heat up the cold water return line.
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Old 01-09-2012, 09:54 PM   #6
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Advice on plumbing two water heaters in series


With a recirc system you have HW, CW & HW return. no cold water return
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Old 01-09-2012, 10:12 PM   #7
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Ok, that makes sense. Thanks!
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Old 01-10-2012, 09:01 AM   #8
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Advice on plumbing two water heaters in series


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With a recirc system you have HW, CW & HW return. no cold water return
Unless you install a grundfos comfort system.

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