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Old 08-15-2014, 07:38 AM   #1
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Default On Demand Water Heater

I'm looking at a job where we'll have to hook up an electric on demand water heater. It requires three, 40 amp 240 volt circuits. So, would you put handle ties on the three, 2-pole breakers so they can simultaneously disconnect the electric water heater for servicing?
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Old 08-15-2014, 07:41 AM   #2
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Why would you need to?
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Old 08-15-2014, 08:08 AM   #3
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Originally Posted by Chris1971
I'm looking at a job where we'll have to hook up an electric on demand water heater. It requires three, 40 amp 240 volt circuits. So, would you put handle ties on the three, 2-pole breakers so they can simultaneously disconnect the electric water heater for servicing?
No, it's not required.
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Old 08-15-2014, 08:22 AM   #4
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Why would you need to?
From a service standpoint. Shut off all the power before working on the water heater. That was my thought.
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Old 08-15-2014, 08:34 AM   #5
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From a service standpoint. Shut off all the power before working on the water heater. That was my thought.
We have one in our shop although it takes two 60 amp 240v circuits. All I did was put two breakers in and at the water heater install two 60 amp disconnects.
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Old 08-15-2014, 08:52 AM   #6
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I'd probably try and talk the customer into a gas tankless!
Sure you'll make money on the install but you'll tick off a customer when they found out how much it costs to use it!
They'll be really ticked when their "hot" shower turns into the "ice capades" for a few seconds during the shower!
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Old 08-15-2014, 10:18 AM   #7
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I've done several and always place a subpanel at the unit. What's the draw? Can you get the breaker for the sub?
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Old 08-15-2014, 11:17 AM   #8
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I'd probably try and talk the customer into a gas tankless!
Sure you'll make money on the install but you'll tick off a customer when they found out how much it costs to use it!
They'll be really ticked when their "hot" shower turns into the "ice capades" for a few seconds during the shower!
Sounds like customer already owns the water heater. I do agree gas qouldbe cheaper. Not my call.
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Old 08-15-2014, 04:58 PM   #9
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I'd probably try and talk the customer into a gas tankless!
I'm gonna take a wild guess that there is no gas available.

If you or your AHJ felt the need for the whole thing to be disconnected with one switch, install a small sub.
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Old 08-15-2014, 05:59 PM   #10
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Originally Posted by Chris1971
Sounds like customer already owns the water heater. I do agree gas qouldbe cheaper. Not my call.
I heard both sides of the story. Some say gas is cheap now, but the price will go up quite a bit in the I future years. While electricity will stay around the same price.

It also seems that electric on demand water heaters are much cheaper than gas of the same kind.

Some say installation costs are cheaper for electric, I find it hard to believe with the amount of amperage required. I've never installed one so I can't say

Apparently gas ODWH also requires servicing more often too.

I guess really it all depends on the homeowner and what they believe will work best for them. When I lived in Florida, gas wasn't provided to residences. However now that I'm in Michigan, everything runs on gas.
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Old 08-15-2014, 06:27 PM   #11
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Originally Posted by A Little Short View Post
I'd probably try and talk the customer into a gas tankless!
Sure you'll make money on the install but you'll tick off a customer when they found out how much it costs to use it!
They'll be really ticked when their "hot" shower turns into the "ice capades" for a few seconds during the shower!
Why would it go cold?
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Old 08-15-2014, 07:48 PM   #12
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Why would it go cold?
I've had one that the HO turned the temp all the way up. Then when it's running and gets to hot they turn down the flow to where it drops below the minimum and shuts the electric down. Service call cost them on that one.
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Old 08-18-2014, 09:07 AM   #13
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Why would it go cold?
A lot of it depends on the temperature of the water supply. Whole house electric units are not recommended for areas where water supply is below a certain temperature, which a lot of times is well water.

Also, often times, if the hot water is being used at more than one location at a time, the unit can't keep up and some cold water will pass before it has a chance to heat back up. I've read about, actually talked to one person, where only one person was using it to take a shower and the water will not stay at a constant temp it has cold "spurts". I guess that depends on the size of the unit and the water flow.
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Old 11-16-2017, 09:20 PM   #14
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Did you end up getting this job?
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Old 11-16-2017, 09:34 PM   #15
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Three-year old thread.
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Old 11-16-2017, 10:51 PM   #16
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Did you end up getting this job?
Can I have your rewards points?
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Old 11-17-2017, 02:23 AM   #17
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Three-year old thread.
The best kind..... Aged to perfection.
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