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Check valve for water inlet on hot water heater ?

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Check valve for water inlet on hot water heater ? Ed 12-23-2006
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Posted by Ed on December 23, 2006, 4:35 pm


Should I put a back flow preventer or check valve on the water inlet on a
water heater ?





Posted by Toller on December 23, 2006, 5:17 pm



> Should I put a back flow preventer or check valve on the water inlet on a
> water heater ?
>
Thats about the last thing you want to do. Why would you even consider it?



Posted by DerbyDad03 on December 23, 2006, 7:03 pm


Toller wrote:
> Thats about the last thing you want to do. Why would you even consider it?

There are (at least) 2 possible reasons for a check valve on the inlet
of a hot water heater.

1 - Some municipalities require a check valve to prevent the flow of
water from the house back to main.

2 - A check valve is used when a recurculating system is used to
prevent long waits for hot water at fixtures far from the heater.

If you do use a check valve, you should also use an expansion tank in
between the valve and the water heater. If you don't, you run the risk
of having water leak from your pressure relief valve when the water
heats up and has no place to go due to the check valve.

Toller wrote:
> Thats about the last thing you want to do. Why would you even consider it?

> > Should I put a back flow preventer or check valve on the water inlet on a
> > water heater ?
> >


Posted by Charles Schuler on December 23, 2006, 5:18 pm



> Should I put a back flow preventer or check valve on the water inlet on a
> water heater ?

That depends. A house that I owned up until 6 years ago was on top of a
hill. When the water supply failed (e.g. when there was a fire on my
circuit and the pumpers went whole hog) the water from the tank got sucked
back into the mains and the heating elements on my heater burned out ...
happened several times ... I was forced to install a check valve.



Posted by Toller on December 23, 2006, 6:25 pm



>
>> Should I put a back flow preventer or check valve on the water inlet on a
>> water heater ?
>
> That depends. A house that I owned up until 6 years ago was on top of a
> hill. When the water supply failed (e.g. when there was a fire on my
> circuit and the pumpers went whole hog) the water from the tank got sucked
> back into the mains and the heating elements on my heater burned out ...
> happened several times ... I was forced to install a check valve.
I am tempted to say that is impossible. Even if a siphon could be
established, if no taps are open the water in the heater couldn't get sucked
out.



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