Add drain for hot water heater

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Bschooly

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First off, I'm so sorry to hear about Terry's illness. He helped me with a prior project. Super guy and so knowledgeable about plumbing. Prayers to Terry and his family.

I'm remodeling another bathroom. Plumbing wise this involves a new shower. While at it I want to plumb a drain to the adjacent hot water heater. The plan is to tap into the shower drain just below the flange. See pictures. Guessing there is a span of 4 feet total. Do I tear out that span or try to work pipe under the slab? How best to tap into the shower line? Looks to be a 2" cast iron pipe.

Bill
 

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Chucky_ott

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if you're concerned about a leak and that pan filling up, why not just put a water leak alarm in the pan?
 

Bschooly

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I've decided to raise the HWH (place on 18 in stand). Then plumb pan to indirect drain that leads to the show drain. This way there is no chance of a drain blockage causing water to back up into the pan. Although the HWH is FVIR compliant, this adds more safety combustion/fume wise. See diagram.
 

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