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Old 11-17-2010, 02:47 PM   #1
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pex and water heater


Hi, I'm going to start replacing some of my old galvi with pex lines. I know that I need at least 18" of a heat buffer zone with pex. Would the standard water heater flex steel conectors be OK with the press fit Shark Bite between the two?

Also I assume the pex needs to be 3/4", right?

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Old 11-17-2010, 03:07 PM   #2
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Which PEX are you using? if you get the A-grade PEX you don't need to do that you can just tie directly into the water heater. You can get it from fergusson or gray hodges or another equivelant plumbing supplier. It uses expansion rings instead of crimp rings and is better made. And yes you want to use 3/4" to the heater.

Also a quick note you should use manifolds for each rooms, a 3 port manifold for the cold and a 2 port for a normal bathroom. The less connections the better.

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Old 11-17-2010, 03:21 PM   #3
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pex and water heater


Quote:
Originally Posted by handifoot View Post
Would the standard water heater flex steel conectors be OK with the press fit Shark Bite between the two?
I personally will not use Shark Bite fittings in my pex installaion. I'ver read that those fittings have rubber O-rings and we all know that rubber deteriorates over time. And especially not on hot water lines where there will be daily expansion and contraction caused by extreme temperature differences due to hot water in the pipes cooling off. My apprehension may be unfounded but FWIW, that's what I've decided for my installation.

Other's milage will vary,
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Old 11-17-2010, 03:40 PM   #4
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my experiance has been that you should not use any sharkbites that close to a water heater. I've had them fail a couple of months after installation because of that. just get 2 brass female adapters, put them on the water heat and connect like normal
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Old 11-17-2010, 07:48 PM   #5
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Quote:
Originally Posted by immeraufdemhund View Post
Which PEX are you using? if you get the A-grade PEX you don't need to do that you can just tie directly into the water heater. You can get it from fergusson or gray hodges or another equivelant plumbing supplier. It uses expansion rings instead of crimp rings and is better made. And yes you want to use 3/4" to the heater.

Also a quick note you should use manifolds for each rooms, a 3 port manifold for the cold and a 2 port for a normal bathroom. The less connections the better.
my code book does not care what brand you use for pex, they still want it at least 18" away from the tank. i've also seen what happens when pex is too close, and I wouldn't even think of doing it in my house
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