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Author:
wavoman (NJ)
Sorry I can't find advice on this anywhere! Any help would be very much appreciated. Two hot water heaters, each has 1" output. I need to feed 1 1/4" pipe. Do I use a single 1" T-coupler, and then take the 1" output from the T and connect it to a 1"-to-1 1/4" coupler ... or do I use two 1"-to-1 1/4" couplers, one on each side, and then a 1 1/4" T-coupler?
I thought I should use the two 1"-to-1 1/4" couplers and a 1 1/4" T, but everyone I talk to says NO, that is wrong and will actually hurt, I should use the 1" T and then the single 1"-to-1 1/4" coupler !
Thanks in advance ...
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Author:
North Carolina Plumber (NC)
Is one heater feeding the other ? If not then just use a pair of 1" X 1" X 1 1/4" tee's, one for the cold side and the other for the hot.
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Author:
Pipe runner (AZ)
with your parallel set up you are trying to equalize total pipe length and fittings on each output so that the hot water draw will be equal. run 1" piping from each heater to bull head tee 1" x 1" x 1.25" (run, run, branch)
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Author:
wavoman (NJ)
Got it! Thank you both, so much!
Edited 1 times.
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Author:
bernabeu (SC)
you use reverse return piping and 2 - 1 1/4 x 1 1/4 x 1 tees (C & F) and 2 - 1 1/4 x 1 ells (E & D)
this shows the PRINCIPLE of said piping for equal flow through multiple units
the actual 'developed length' of piping is IDENTICAL
you will not have a pump and your 'layout' will be different, but the principle remains
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
Edited 3 times.
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Author:
hj (AZ)
And, why not use 1 1/4 x 1 x 1 tees?
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Author:
bernabeu (SC)
2- 1 1/4 x 1 x 1 tee
and
2- 1 ell
are just as good
OP,
just remember tees are 'called' run-run-bull - ALWAYS
hj,
I bow in awe 
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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638
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