Log in or Sign up. Jan 29, Location: Hey everyone - I have a question on multiple HWHs installed in my residence. When I bought the house it had two 40 gallon electric HWHs plumbed in series. It's a large house, and we have two teenage kids and relatives that visit for long periods.
We have always enjoyed the voluminous amounts of hot water. This summer, the second HWH in the series failed with rusty water leaking out the top electrode.
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I simply removed it from the circuit, and have been relying on the first heater. This setup seems to be working fine provided, of course, that I get to the shower every morning before my daughter. During the recent winter storm we had an extended power outage, and I decided I want to put a second HWH back in the circuit.
I plan to wire the second HWH to my garage electrical subpanel where my generator transfer switch is located so I can have at least some hot water during the next extended power outage. I am considering the GE 9-year electric 50 gallon from HD as it seems the best value for what you get.
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I would then replace the first HWH in the series within a year or so, as the budget allows, with a similar one under the assumption that it will probably fail soon as well. Before I jump into Hook up 2 hot water heaters, I have a few questions: Is it better to plumb two tanks in series rather than get one larger tank? It seems an 80 gallon tank costs more than two 40s or 50s.
Is plumbing them in series vs parallel the right way to go? Am I correct in wiring the second one to the generator transfer switch so that if I lose power and am running off backup power I don't have to run through 40 gallons of cold water before I get hot water? Should I consider propane for the second HWH? This would be nice in a power loss situation, but I have not had very good luck with propane HWHs in the past. And I have had to replace the propane valves on the furnaces, fireplaces, etc.
Are there other considerations I should consider? Thanks all for your input. OffbalanceJan 29, Aug 17, Occupation: The size of the two tanks wouldn't matter if run in series.
The elements are the same wattage. The electrical panel won't know the difference. Having two tanks means you have twice the recovery. A single 80 gallon has one element working at a time. With two tanks, you can double that. Of course, you also have more exterior space with two tanks that need insulating.
Most of the time we would just install a single eighty.
Twenty years from a water heater? That's pretty darn good. TerryJan 29, Jan 6, Location: The tanks should be identical in everyway for a parallel configuration. Hackney plumbingJan 29, Aug 31, Occupation: In series each heater is independent. They can be any sizes and even a mix of gas and electric. Dec 28, Occupation: If you buy the cheap HD variety, change the anode or at least check its length.
Remove the plastic drain and put in a ball valve, I got one cross threaded that would have flooded a house.
You could cut off the original one and drop it into the heater. And you need a impact wrench to get out the old rods, but for stuck elements, a good chisel and hammer can break the rust if you have good geometry. Better have a BIG genset to run a water heater.
Speaking of generators running water heaters,After a hurricane we had I changed my watt element out for a w to heat my water once a day. I just direct wired it to the element and let it run until the bottom of the tank got hot. Hackney plumbingJan 30, Aug 23, Location: Runs with bisonJan 30, Hook up 2 hot water heaters get the maximum stored water out of your water heater,pipe the incoming line to the drain valve location.
Install an alternate drain. Beware of thermal stacking if you pipe the cold to the bottom as this chance increases. Make use of this extra top inlet for an extra anode rod.
Actually, you could have just wired the element to volts and had a watt heater.
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I do it regularly for low use, shop type units My genset will handle the Watt elements, but probably not if both fridges, the septic pump and the furnace all decide to start at the same time, so I may put the HWH on a separate transfer switch. Ballvalve, I had already planned to replace the cheesy plastic drain with a real ball valve as I have always done before.
I'll check the anode rod tomorrow, and order one if necessary.
Thanks everyone for your input! OffbalanceJan 30, The only time I would check my anode rod was after the tank was taken out. Hackney plumbingJan 31, Nov 20, Occupation: I notice watt elements run on volts give watts, therefore your math works. So that makes Hackneys removal of the element unneeded, and explains my lifetime elements.
Maybe HJ has his anodeless heaters hooked up to volts. This link does not work, but it and several other 'expert forums' also use the wattage on half voltage.
It all comes down to Ohm's Law. If you put your elements in parallel, the resistance R is cut in half and would double the total power. As you said, on v, your elements should last forever probably until the tank falls apart.
It is much like using v rated lightbulbs lasting much longer than the normal bulbs, since they are being ran at below design voltage. You must log in or sign up to reply here. Share This Page Tweet. Your name or email address: Do you already have an account?
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Multiple problems with water heater maybe? Flexible Water Heater Connection Questions. Cold water feeds into 2 heaters Applies to gas and electric water heaters Turn down thermostats and save, turn up thermostats and install mixing valve to increase amount of hot water. Buy: . Where to connect wires going to second tank.
water pipe in multiple heater installations. Having equal number of fittings; as well as, lengths of pipe. Series- Piping the outlet of one heater into the inlet of the.
I like doing parralel piping....
It sounds like you are describing two different problems. FIRST PROBLEM: Turning off a hot water heater. First, there are two ways to hook up.
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