Code REQUIREMENTS FOR INSTANT WATER HEATERS

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lcunit81

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There is a tankless instant water heaters underneath the sink in a restroom. Next to it there's a 4-square box with a industrial cover plate with a single pole switch rated for 20 amp and was flex out with a liquidtight metallic conduit (is this a code violation or not?) Ive seen water heaters that been install with a cord plug or a switch disconnect or toggle switchor a straight run from the panel from the circuit breaker ( Im confused?). Im trying to find the article on the requirement for a instant hot and also knowing and understanding on appliances what requirements are acceptable for location and needing a cord plug, switch disconnect, switch and circuit breaker. Here are the spec's and a image of it on the WEB# also wire that was run into the 4 square is wire in 10 AWG
Part# SP3012
120V
3.0kW
25A
41?F
10 AWG
http://www.heatersrus.com/products/sp.htm
 
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What article specifies on instant water heater. And understanding the requirements the use of a disconnect. There's been disputes wether or not it needs a disconnect or not? wether is a single phase, two phase or three phase?
 
I have to agree with Marc. If you go to 'Techincal' from your link it shows what appears to be a KO for electric supply, not a cord.

I got a chuckle out of the first thing that pops up at 'Technical'.:smile:
 
lcunit81 said:
What article specifies on instant water heater. And understanding the requirements the use of a disconnect. There's been disputes wether or not it needs a disconnect or not? wether is a single phase, two phase or three phase?
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Try this out.

422.31(B) Appliances Rated over 300 Volt-Amperes or Horsepower. For permanently connected appliances rated over 300 volt-amperes or hp, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is capable of being locked in the open position. The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.
FPN: For appliances employing unit switches, see 422.34.
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question on a similar situation

question on a similar situation

I ran into almost the exact same water heater.The model is rated at 3.5 kw and 120 volt.This comes to 29 amps.Wire size is #10.I can't find a single pole 30 amp snap switch that is rated to carry 30 amps.That was the question I had about the installation you were talking about.If the heater was rated for 25 amps, is it proper to install a 20 amp?
 
bob j said:
I ran into almost the exact same water heater.The model is rated at 3.5 kw and 120 volt.This comes to 29 amps.Wire size is #10.I can't find a single pole 30 amp snap switch that is rated to carry 30 amps.That was the question I had about the installation you were talking about.If the heater was rated for 25 amps, is it proper to install a 20 amp?
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You didnt look hard enough. :grin:
Leviton Catalog # 3031-2I
UPC # 07847736185
30 Amp, 120/277 Volt, Toggle Single-Pole AC Quiet Switch, Industrial Grade, Self Grounding, Back & Side Wired

They run about $25 ea

~Matt
 
30 amp switch

30 amp switch

TOOL_5150 said:
You didnt look hard enough. :grin:
Leviton Catalog # 3031-2I
UPC # 07847736185
30 Amp, 120/277 Volt, Toggle Single-Pole AC Quiet Switch, Industrial Grade, Self Grounding, Back & Side Wired

They run about $25 ea

~Matt
Click to expand...
I saw the same switch on the Leviton website, and it says that the maximum amp rating for the switch is 24 amps.:confused:
 
bob j said:
I saw the same switch on the Leviton website, and it says that the maximum amp rating for the switch is 24 amps.:confused:
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That should be it's continuous rating.

30 amps non-continuous, 24 amps continuous.
 
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