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Old 12-18-2011, 10:13 PM   #1
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Default 2 water heaters. tandem or series?

How do you guys plumb 2 heaters? I always run them tandem. I think its best for both heaters to be fed and worked evenly. When run in series, one heater is basically just a storage tank. You also can shut down and remove one heater when run tandem. In series you are sol.
Pros, cons?
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Old 12-18-2011, 10:32 PM   #2
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How do you guys plumb 2 heaters? I always run them tandem. I think its best for both heaters to be fed and worked evenly. When run in series, one heater is basically just a storage tank. You also can shut down and remove one heater when run tandem. In series you are sol.
Pros, cons?

I prefer parallel ( which I think is what you called tandem). Just gotta keep your piping lengths right.
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Old 12-18-2011, 10:44 PM   #3
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Depends on the needs.
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Old 12-18-2011, 10:56 PM   #4
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Parallel... Always parallel..
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Old 12-18-2011, 11:28 PM   #5
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Reverse return or parallel. Depends on which is easier.

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Old 12-19-2011, 02:55 AM   #6
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Just install one tankless, it will work.
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Old 12-19-2011, 06:00 AM   #7
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When running im parallel if your piping isn,t the same length will one heater not work more than the other. I realize in series the first tank is gonna run more.

I usually run in series (electri)
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Old 12-19-2011, 01:09 PM   #8
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I would think that there would be a little more to balancing the draw on parallel installs than just pipe length. Difference in flow restriction in the heat traps and dip tube will affect the balance won't it. There could also be and issue with sediment build up, which will be higher on a parallel install, due to spliting the flow rate in half. Of course it does depend on the application and why you are useing two heaters and not one. You are not SOL when it comes to removing 1 heater out of a series system if they are plumbed correctly. I install all series heaters with a bypass.
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Old 12-19-2011, 07:18 PM   #9
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The bigger houses I've done are usually 2 50 gallon power vent heaters. I think the piping looks flossier in tandem, and if one heater fails, you can shut the ball valves and remove the bad heater while leaving hot water available. I think one heater does all the work when plumbed in series.
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Old 12-19-2011, 10:00 PM   #10
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The bigger houses I've done are usually 2 50 gallon power vent heaters. I think the piping looks flossier in tandem, and if one heater fails, you can shut the ball valves and remove the bad heater while leaving hot water available. I think one heater does all the work when plumbed in series.
One heater doesn't do all the work, but it does do alot more than the other. Because of this the second heater recovers quicker. You can remove one out of a series and leave hot water available if plumbed correctly. The tandem or parallel is a cleaner and easier install though.
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