Forum Discussion
wa8yxm
Mar 27, 2022Explorer III
MrWizard wrote:
What is the reason for the check valve in the output ?
There are 3 different types of water heater bypass systems
1 valve
2 valve
3 valve
All 3 have pipes in a sideways "H" pattern Or a wide capitol I if you have the proper font) The top line is usually red and is the HOT pipe
The bottom usually white and COLD The vertical pipe is the bypass and can be any color
On the 3 valve system the bottom is often white and the top red
On the 3 valve system the tank side of the bypass line has a valve in the hot and cold lines (one valve each) and ther is a valve in the bypass.. To USE close the bypass valve so the pipe and handle are like this + and open the other two (=)
To bypass. reverse that.
Next is the 2 valve system. these are 3 way valves
With the handle pointed towards or away from the heater.. USE
With the handles pointed either toward or away from each other BYPASS
Finally we have the single valve system
one 3 way valve in the cold line.. it either sends water into the tank or into the bypass.. but if it's sending water into the bypass what's to keep it from "Back filling" the heater via the hot water outlet?
The check valve of course
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