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Old 12-27-2013, 09:02 AM   #1
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tankless water heater


my 15yr old 30 gallon water heater went out in my trailer.

I'm thinking of installing a tankless heater. The old setup has 10/2 wire (2 hot and green ground) and 2 25amp switches in the breakerbox. The run from the unit to the box is only about 6-8 feet.

I'm trying to figure out what size water heater I can go with. I don't have the money to upgrade the wires/breakers so i want to make sure I get the right thing first shot.

Thanks for any info!

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Old 12-27-2013, 09:11 AM   #2
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you'll be limited to 6 kw. that is rather small for a tankless unit.

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Old 12-27-2013, 09:36 AM   #3
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Is the setup now considered 220v? Most heaters i'm finding are 240v

since there are 2 25amp switches connected together is that a 50amp maximum for the power?
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Old 12-27-2013, 09:37 AM   #4
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so would it just be best for me to get another 240v 30-40gallon heater instead of going tankless?
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Old 12-27-2013, 09:39 AM   #5
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Quote:
Originally Posted by kevknife View Post
Is the setup now considered 220v? Most heaters i'm finding are 240v

since there are 2 25amp switches connected together is that a 50amp maximum for the power?
220, 240, same thing as far as this application is concerned.

your amps are still limited to 25 but you get 25 amps at 240 volt instead of 25 amps at 120 volt. more power at 240 volt for the same amount of amps.
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Old 12-27-2013, 09:41 AM   #6
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tankless water heater


Quote:
Originally Posted by kevknife View Post
Is the setup now considered 220v? Most heaters i'm finding are 240v
Same thing.



Quote:
Originally Posted by kevknife View Post
since there are 2 25amp switches connected together is that a 50amp maximum for the power?
No, it's a 25A 240V circuit.


Quote:
Originally Posted by kevknife View Post
I don't have the money to upgrade the wires/breakers so i want to make sure I get the right thing first shot.
Without any hesitation, my only advice to you is to put a standard water heater back in.
There is NO WAY you'll get nearly the same performance from a tankless using only that one 30A circuit. Besides, you'll likely need at least a 200A service for the right size tankless unit.
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Answers based on the 2008 & 2011 NEC.
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Old 12-27-2013, 09:41 AM   #7
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Originally Posted by kevknife View Post
so would it just be best for me to get another 240v 30-40gallon heater instead of going tankless?
yes. at 6 kw, you'll pretty much be limited to using, like, one sink at a time, depending on your incoming water temp from the street/well. better off to go with a bigger tank unit.
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Old 12-27-2013, 12:37 PM   #8
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If you don't have the money to do an electrical upgrade, you sure don't have the money to buy a tankless water heater ( gas OR electric).

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