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Old 04-17-2009, 02:13 PM   #1
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Default dual water heaters

Is it okay to hook up two water heaters of the same size and make in parallel if they are on opposite sides of the house?
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Old 04-17-2009, 05:24 PM   #2
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My vote is no..
Do it in series and insulate all piping well.
The different lenghts of piping, both hot and cold will give one heater an advantage if you will, via less friction loss thus it will work more and when it runs out of hot water it will deliver cold water and your other water heater could sit there and stay hot and not be drawn from.


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Another important point of parallel installation is the length of the supply piping and delivery piping – they must all be the same length. As shown in the drawing below, section A-E must be the same length as section A-B; C-D must be the same length as F-G; E-F must be the same length as C-B. The same holds true for the hot water outlet side. Because the water pressure is constant along the cold inlet piping and hot water supply piping, the heater with the closest 'run' will do the majority of the work. To prevent this we ‘balance’ the unit with equal pipe lengths. When installing heaters (and storage tanks) in parallel, it is important to accurately plan and measure the distances from the cold water supply pipe to the heaters and from the hot water outlet on the heater to the hot water supply line. This will equalize the work between the two water heaters.
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Old 04-17-2009, 10:40 PM   #3
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Tanks in series, tankless in parallel.
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Old 04-17-2009, 11:11 PM   #4
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I would never pipe heaters in series unless I was doing more than two, and if that was the case I would consider a boiler and storage take above multiple heaters.
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Old 04-17-2009, 11:47 PM   #5
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Pipe one as a storage tank, that is the way to do it.
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Old 04-18-2009, 12:35 AM   #6
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He said there on differnt sides of the house, an existing condition I do believe and not a perfect world, yes?

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Old 04-18-2009, 01:25 AM   #7
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I always reccomend parallel. I don't see the advantage of series piping , at all.

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Old 04-18-2009, 12:31 PM   #8
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I'm sure helgore will explain.
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Old 04-19-2009, 09:19 PM   #9
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A friend piped the water this way in a new house, I believe he already split the system back up. When he first piped it that way it was on accedent and he asked me if it was okayto leave it. I told him it was okay piping the heaters in parrellel but I didn't know about having them on opposite ends of the house.
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Old 04-19-2009, 09:31 PM   #10
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Parallel piping of equal length...

That's easy just leave the extra pex spooled up in the attic...

Helgore will explain it all!

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