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Old 06-17-2008, 05:37 PM   #1
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Water heater connection


I want to hard pipe my water heater. I have noticed that a lot of plumbers just put a copper fitting onto the galvanized nipple coming out of the water heater. They then go up 6 inches and add a copper union. I though a dielectric union is required. Is this correct? I was planning on just putting a dielectric union right onto the glavanized nipple coming out of the union. I would then just terminate the copper fittings into it. Is this the correct way?

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Old 06-17-2008, 07:26 PM   #2
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Yes it is.

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Old 06-17-2008, 07:55 PM   #3
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Those are most likely insulated and not galvanized nipples. You can use dielectric unions on them as you stated you were planning, however with the use of the insulated nipples there really is no need. I cannot tell you how many dielectric unions I've replaced because they are corroded up to the point of constricting flow to the point of nil.
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Old 06-17-2008, 08:24 PM   #4
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Those are most likely insulated and not galvanized nipples. You can use dielectric unions on them as you stated you were planning, however with the use of the insulated nipples there really is no need. I cannot tell you how many dielectric unions I've replaced because they are corroded up to the point of constricting flow to the point of nil.

I saw a few of these nipples sold separately. They have plastic lining in them. The said they were dielectric nipples. I thought it was the heat trap. The ones coming out of the water heater look like a nipple with blue plastic lining. What would you recommend? Would you recommend doing it in all copper including the union? The copper unions at Home Depot are horrible.
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Old 06-17-2008, 09:51 PM   #5
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we always use nut x nut or nut x sweat 18" copper water heater flexes.
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Old 06-17-2008, 09:52 PM   #6
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Everything at Home Depot is horrible.

Edited above for complete and utter accuracy.

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