[Shop-talk] more water heater

[Michael Porter]

Brian Kemp wrote:
> I couldn't find a code reference in a quick internet search, but I was 
> told by an inspector that it was against code to have a hot water 
> shutoff valve on a water heater (assuming a tank type), only a cold 
> water shutoff valve that feeds the water heater.  Having a hot water 
> shutoff that accidentally got closed may lead to over pressurization 
> of the tank and an unexpected boom should the T&P valve fail.
>
> Others on the list may want to consult with their local building 
> inspector if considering adding a valve on the hot water side of their 
> tank.
>

Umm, that sounds a bit strange, if only because there's no difference in 
having a valve closed immediately after the tank and a valve closed 
fifty feet away--in a closed system, the pressure is equal at all 
points. With all the ancillary valves in the system closed, same-same.



Cheers.



-- 


Michael Porter
Roswell, NM


Never let anyone drive you crazy when you know it's within walking distance....