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Old 25-03-2019, 08:38   #1
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water heater bypass valves

Hi All,

Going to replace the water heater and want to install bypass valves to ease the winterizing process.
Which valve should I use? Brass? PVC ? Bronze? anything else?

Thanks
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Old 25-03-2019, 08:48   #2
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Re: water heater bypass valves

As it’s not salt water, the choice is whatever you want...
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Old 30-03-2019, 20:05   #3
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Re: water heater bypass valves

I used pex type on mine.
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Old 31-03-2019, 04:58   #4
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Re: water heater bypass valves

As our boat is plumbed with Whale plumbing fittings, that's what I used.

Even if yours is not, easy to use Whale pipe and fittings right at the tank, and then connect to what lines you have.
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Old 31-03-2019, 06:16   #5
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Re: water heater bypass valves

The choice is your when Iím working on a boat i try to match what most of the other parts are done like If all brass than brass if all pex than pex and so on this makes it fit in as always there and professional done
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Old 31-03-2019, 07:30   #6
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Re: water heater bypass valves

I did this project a few years ago using PVC valves with threaded fittings. Iím petty good at this stuff but it failed. The HWH gets as hot as the engine temp, ~180įf when heated by the engine and it seems that was too hot for the pvc. The threaded joints didnít leak at first but did after getting so hot. I tore it all out. I still havenít redone it but will do it with brass ball valves and add a mixing valve to control the temp of the outflow.
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Old 31-03-2019, 11:16   #7
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Re: water heater bypass valves

Threaded PVC will leak with high heat, but valves with glue fittings will last a long time. Look for CPVC valves and pipe. Also use schedule 80 pipe, not much more but with a thicker wall. It's more resistant to breakage from vibration.
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