connecting two water heaters?

Question

I got a 60 gallon water heater, and it is not enough for my jacuzzi. I just bought another 60 gallon one, to connect them togeter, do i need special valves or do i just connect them the main water pipes so so each one works independently.

i will connect it in a parralel style, any special valves? or do i just connect it the same way the firstt one is connected.

Answer 1

The best way to connect the two tanks is in a parallel configuration. To do this install a valve on the cold water line before it enters the first tank.Between the vavle and the heater install a t and a piece with a 3/4" female adapter. Here you want to install an expansion tank. make sure you get one for larger heaters.run the hot out line to other tanks cold inlet. you can put a valve her if you want but its pretty much useless unless you pipe in a bypass also. then connect the hot line out of that tank back into your house hot feed line. If you want to install a bypass its basically the same as installing the heaters individually with both hot outlets feeding the same hot feed pipe to the house. split the colds, two valves,one expansion tank( only one tank needed to cover the whole house), two outs with backflow preventers on each hot line, join them back into the house feed line. If you do this you will want to install backflow preventers on the hot sides of both heaters before they join and fed the house. The only real advantage of this is if one fails you can isolate it untill you get it fixed and still have hot water. You could possibly put the second (or even both heaters) on a timer. Then you could limit the energy cost to run two large heaters all the time. A cheaper in the long run alternitive is checking into an in line heater installed directly in the jacuzzi. That way you wouldnt always be heating water you are not going to use.

Answer 2

Multiple water heater installations are predominantly for commercial or industrial applications where a high capacity of heated water may be required during peek times; however some residential homes may also benefit if they have large volume fixtures such as a jetted tub or hot tub. When designing a potable water system, great care must be taken to fully anticipate the current and future demands of heated water. If you need help determining the expected hot water requirements.Multiple water heaters can be installed in two primary methods that are very similar; series connections and parallel connections, each having its own benefits and drawbacks depending on the desired result.

Connection water heater in series:
When water heaters are connected in series it means the cold water is fed through each tank; one after the other, with the first tank's hot outlet becoming the next tanks cold inlet. Under normal conditions the first tank in the series will do most of the heating. Under high demand situations the first tank will not be able to sufficiently heat the water so the next tank in series would begin operation, and the next...until the water is up to temperature.
Connecting Water Heaters in Parallel:
Unlike in a series connection, the water supplied and distributed by a parallel connection is evenly balanced causing all the tanks connected in parallel to share the workload. The piping arrangement to and from parallel connected water heaters are extremely important to ensure the water is evenly distributed and does not take the path of least resistance.

https://www.electrikals.com/products/rc-home-appliances/water-heaters?cnid=e767e5db4e4c7d52014e4d4c088a02ae&cid=10000&page=1&pagesize=20

Answer 3

Are you talking about a Hot tub?/ If so do you refill it with every use?
If it is a whirlpool tub not sure why you would need 120 gallons of hot water. Sure you don't just need one tank and a tempering valve to increase the available volume of water?? How about a tankless heater. No sense in expending energy to keep that much water hot.

Maybe research this problem a bit more.