MWBC for sump pump and gas water heater?

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jeff48356

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Livonia, Michigan
I was wondering if I would be allowed to wire a 15A MWBC to power a sump pump and a gas water heater in the basement. I would run the 14/3 down to the first GFCI outlet (to power the water heater blower), then on over to the other GFCI outlet to power the sump pump. Any Code issues?
 
gadfly56 said:
Could be a spark-start unit, no standing pilot.
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The ones we use don't have a pilot and don't use 120v power. It creates it's own electricity.

A spark produced from an electrical current ignites the gas in a pilotless water heater. Think of it as the equivalent of the sparkplug in the car igniting the fuel mix in the engine cylinder. The electricity for the spark is from a wall outlet or from an internal generator utilizing the movement of the water through the pipes to produce electricity. In the case of an internal generator, the water heater continues to function even during an electrical blackout
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Dennis Alwon said:
The ones we use don't have a pilot and don't use 120v power. It creates it's own electricity.
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I think he’s talking about a power vented water heater.
And as a side note.......that MWBC needs to land on either a double pole breaker or two single poles with handle tie.
 
mopowr steve said:
And as a side note.......that MWBC needs to land on either a double pole breaker or two single poles with handle tie.
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I thought that was only the case if both sides of the MWBC are powering the same receptacle. The receptacles in question here will be in two different boxes. How would this be any different from simply having two different circuits present in the same box?
 
jeff48356 said:
I thought that was only the case if both sides of the MWBC are powering the same receptacle. The receptacles in question here will be in two different boxes. How would this be any different from simply having two different circuits present in the same box?
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You would not be sharing the neutral with two separate circuits.
 
It’s about the fact that you are sharing the neutral. The landing on the same yoke is just one of the requirements for “disconnecting all ungrounded conductors in a MWBC.” The other is when a neutral is being shared, because if someone turns off one of the circuits the neutral will still have current on it from the other circuit. Something that will get your attention if your working on the neutral.
 
Dennis Alwon said:
The ones we use don't have a pilot and don't use 120v power. It creates it's own electricity.
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Plumbers in Massachusetts install high efficiency power vented heaters with intake/exhaust piping. about 3-4 amperes and the instructions for ones being used on my job says it can be connected to any circuit but we use dedicated.
 
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