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Old 03-14-2015, 04:43 PM   #1
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Two Tankless Water heaters on same pipe?


I am in escrow to buy a newly remodeled home. Its a long skinny home, not a box. Think a box of aluminum foil in your kitchen cabinet. I estimate it's about 100' long.

There are two Rheem 199,900 BTU hot water heaters on opposite sides of the house--about 100' apart.

It takes forever to get hot water, and it sure doesn't feel like the Rheem is outputting the 140 degrees that the units are supposed to put out.

As part of a pre-buy inspection, I had a plumber look at the hot water issue. He said the the two Rheem heaters shared the same pipe, with the showers, sinks, teeing of the same pipe. He said that basically one hot water heater would put out heat and that heat would run into a large run of cool water in the single long pipe and the hot water would cool down.

I tried calling Rheem, but could get technical advice about whether the installation was okay. It sure worries me.

My plumber suggested putting both units next to each other on the same side of the house and linking them together, insulating the hot pipes and running a recirculating pump. This would entail the added expense of adding a recirculating pipe and pump. Remember that the kitchen is about100 feet from the furtherest bathroom--long skinny house. So, I am not sure if putting both heaters next to each other on one end of the house is a good idea.

I wondered if the single hot water pipe could not just be cut in the middle and capped in order to create two separate zones.

The units are Rheem Ecoh200XLN3. They look like quality units.

Your advise sincerely appreciated.
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Old 03-14-2015, 06:15 PM   #2
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https://www.rheem.com/pdfs/_temp/11000Series/11140.pdf

Above is what you need to do for a return circulation setup.

If you install without the tank your tank less heaters will constantly fire.

I would isolate what each tank serves. By the way no matter what you do without a circulator you will never get instantaneous hot water out a faucet. All the instantaneous does is produce hot water upon demand. Instead of storing and heating it in a tank.

Last edited by Ghostmaker; 03-14-2015 at 06:23 PM.
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Old 03-14-2015, 09:20 PM   #3
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I think I would divide the hot water line you you are thinking.
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Old 03-15-2015, 10:30 AM   #4
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Yep feed one side separate from the other side on the hot.
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Old 03-16-2015, 12:02 PM   #5
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Thank you very much.
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