|
- over 500,000 plumbing related posts
- The popular plumbing tips and advice forum and blog. Ask any toilet, sink, faucet, pump, water quality and plumbing related questions.
|
|
Author:
Fixitangel (NC)
Most water heaters are fed by a cold water line and (usually) a cut off valve. When adding an expansion tank does it matter which side of the cut off valve it is intalled; i.e. on supply side or heater side? Thanks everybody.
|
 |
|
|
Author:
North Carolina Plumber (NC)
Has to be between the tank and valve, otherwise if the valve was closed it would be the same as not having a tank.
|
|
|
|
|
Author:
sidejob bob (FL)
w/h valve tank in that order
|
|
|
|
|
Author:
packy
bob, did you mean to say w/h -tank -valve?
|
|
|
|
|
Author:
hj
The tank SHOULD be between the valve and the tank, but as a practical matter, if the water supply is not turned off to the tank while the water is being heated, there is no expansion, so the tank ahead of the valve will work just as good.
|
|
|
|
|
Author:
sidejob bob (FL)
as long as the check valve is first it's not needed to be past the w/h valve in a closed system .
|
|
|
|
|
Author:
bernabeu (SC)
the compression/expansion tank needs to be on the heater side of any supply stop valve
ps. hj, let's not start the debate re: compression/expansion or open/closed piping systems
- - - - - - -
Measure twice, cut once.
Retired Plumbers Local Union #1
|
|
|
|
|
Author:
hj
HE asked if it where it HAD to be, and in a normal world, it really is immaterial, except to engineers.
|
|
|
|
|
Author:
dlh (TX)
not necessarily bernabeu, it is the best and most practical place for it but as long as it is on the house side of the part making it a closed system it makes no difference where it is installed other than it wont last as long if you put it on the hot water line
- - - - - - -
PLUMBERS "Protecting The Health Of The Nation"
|
|
|
|
|
Author:
SwimRunPlumb (MI)
Shouldn't it be after the valve to the heater in case the valve gets closed? If the valve gets closed for some reason, it is not able to do it's job correct?
I know I have seen you guys discuss this before, but I forgot the reasoning why you guys say it doesn't matter.....
|
|
|
|
|
Author:
hj
If the valve is closed, then you cannot use the hot water, therefore the tank will NOT start to heat, which means there will be no thermal expansion, ergo, no need for the expansion tank at that point. IF the valve is turned off while the tank is operating, then there is a chance that thermal expansion will operate the relief valve, but it will ONLY discharge the few drops it takes to compensate for the expansion.
|
|
|
|
|
Author:
bernabeu (SC)
good explanation, hj
i learned something
- - - - - - -
Measure twice, cut once.
Retired Plumbers Local Union #1
|
|
|
|
