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What is the best way to connect two hot water heaters, series or parallel?

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Thu, Feb 26, 2009

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hot water heaters
sgtchunk аѕkеԁ:


Thanks tο everyone wһο аחѕwеrеԁ. It's pretty clear tһаt I didn't provide enough detail. Lеt mе clear things up.

-Gas water heaters
-Wаѕ speaking οf plumbing tһеm іח series οr parallel
-Nοt a boiler system

Sorry fοr tһе confusion

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6 Comments For This Post

  1. Joe Says:

    is relatively easy instead explain you step by step I Got a connection plans for you

  2. yukoneze Says:

    Usually in series…if at all practical to do so…If they are in separate room’s, you have to make sure that they are as close to each other as possible…Whether you use glycol or water in your run, the closer to the boiler, the better…Easier on the pump’s and they will retain the heat better…

    Remember, the thermostat’s send an impulse to the flow valve’s to open the fluid flow…So, keep the run’s as short as possible..You’ll save $$ on the piping, wiring etc…Make sure that they have bleeder valves on each exchange..You’ll have to purge them a bit, when you first start up and periodically thereafter….

    Good luck and have fun…Yuke…

  3. DA Says:

    yukoneze sure likes his apostrophes doesn’t he?

    Now on to the answer:

    If you hook up water heaters in series, keep in mind that they are both going to be heating the water. This is going to be more costly for you to operate.

    If you hook them up in parallel, you would be able to turn them off/down independently depending on your actual use. That will be more efficient, but you’re still going to waste a lot of money.

    A better solution would be to replace your water heater with a larger one. It is easier to install, you won’t have to worry about the appliances getting enough combustion air or have the venting issues that you would if you had two of them.

    Remember, gas appliances need a certain amount of make-up air in order to function properly or the flame will seek out additional air. This causes flame roll-out and scorching on your appliance. Furnaces and water heaters both do this and this is very dangerous. It is always best to get a licensed and insured professional in there to do the job.

  4. ddbb Says:

    I don’t know if you are operating on 240v or 110v mains but either way if you run in parallel you will need supply voltage heaters, if you run in series you will need heaters of half your supply voltage. Otherwise you will be running the 240v at 120v across each etc.

  5. cowboydoc Says:

    I have been in the construction business for forty years and have never seen this done but, gain, I haven’t seen everything. I don’t know if this is practical or a safety hazard. It might also be costly down the line.

  6. Darkgoth Says:

    master electrician, wired many heaters.. and NEVER heard of wiring them in series! Most anything is wired parallel…in a home.
    If you wired in series you are doubling the amperage and wire size and breaker size…why would you do this? I also am not sure if it even would be legal per code. Parallel only run 2 separate circuits off of 2 separate breakers.. that is the proper way to do this.

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