Gas Fired, whole house Tankless Hot Water heater

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sparky_pdx

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I searched the forum as well as the FAQ & didn't see anything regarding this.
I"m wondering if you guys put these on their own 15A branch circuit? They couldn't draw much amperage, I don't think. I don't put a receptacle that an all gas stove plugs into, for its 120V loads on its own circuit. The gas tankless heaters come with a 120V cord/plug on them. I'll have a single receptacle in the garage, so no gfci issues.
Thanks for any help

PS: btw, does anyone know how many amps (or fraction of an amp, a gas stove draws? couldn't be much)... thx again...
Sparky in Oregon
 
I agree that it's likely they do not draw much current. If the unit is fastened in place you can use up to 50% of the 15 amp circuits' ampacity without requiring a dedicated circuit. If the unit draws 7.5 amps or less it can go on a shared 15 amp circuit, 10 amps or less and it could go on a 20 amp shared circuit.
 
chris kennedy said:
If this is a Rannai I think the manufacture calls for a dedicated cir.
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I must admit if this is true I have hooked up many Rinnais without a dedicated cir. To require a dedicated cir. for this unit would be like asking for a dedicated circuit for a gas range ignitor. It would be absurd.
 
Dennis Alwon said:
I must admit if this is true I have hooked up many Rinnais without a dedicated cir. To require a dedicated cir. for this unit would be like asking for a dedicated circuit for a gas range ignitor. It would be absurd.
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Lets not get panicy here. I said "I believe" and now I'm thinking otherwise.

Dennis, you don't strike me as the kind of guy that would one without reading the specs. first.
 
chris kennedy said:
Dennis, you don't strike me as the kind of guy that would one without reading the specs. first.
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To be honest I have never read the specs on any of them, just the info on the unit. I never saw a reason to read them .
 
Most of the units I have seen will require it's own - for some reason they have some larger units have pretty hefty fan forced blowers/exaust. And many smaller ones that dont by code need one due to amperage, say they need one anyway...
 
I have connected lots of them and it is hard to see why you would need a deticated circuit because even with a fan the draw is less then 1 amp. In most units I have seen they run about 30-60watts.
 
Shut off switch

Shut off switch

Is there any requirement for intalling a shut-off switch (for the electrical feed) in close proximity to a tankless gas water heater? What if the tankless heater is going to be located on an exterior wall?
 
Bosch 2400

Bosch 2400

According to the specs for my Bosch 2400 whole house water heater w/freeze protection. 120 V. -Idle=40mA; Operating=<2, 5 A.
 
infinity said:
I agree that it's likely they do not draw much current. If the unit is fastened in place you can use up to 50% of the 15 amp circuits' ampacity without requiring a dedicated circuit. If the unit draws 7.5 amps or less it can go on a shared 15 amp circuit, 10 amps or less and it could go on a 20 amp shared circuit.
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Specs for Bosch 2400 whole house water heater w/ freeze protections. 120 V.--Idle= 40 mA__In operations= <2, 5 A.
 
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