Those would be some unusual water heaters in that case. When you face the label and the gas valve, hot is on your left in all of the WHs I have seen.I will try to shut off gas on the right one. Given the hot water outlet is on right tank, suspect the water will not be hot as before?
it's weird setup, I am still confused if this is series or parallel, as the cold water goes into both tanks, but hot water only out on right tank. I will not turn off gas on right tank because the water will be cold when going out. now I've changed the temperature setting on left tank to low, and right tank to hot, any problem for this?Those would be some unusual water heaters in that case. When you face the label and the gas valve, hot is on your left in all of the WHs I have seen.
Check it. Maybe your WHs have been piped in backwards.
I see that extra connection to the drain port on the right-side tank. That is probably a hot water recirculation line.it's weird setup, I am still confused if this is series or parallel, as the cold water goes into both tanks,
on the top of both tanks are the cold water inlet, there is only one port of hot water outlet, i.e. on the drain port of right tankI see that extra connection to the drain port on the right-side tank. That is probably a hot water recirculation line.
You don't buy that the cold input for a WH should be on the top right?
There are two water pipes atop each WH. What should be the hot out of the right tank is feeding the cold input of the left tank via that copper pipe.on the top of both tanks are the cold water inlet, there is only one port of hot water outlet, i.e. on the drain port of right tank
Thanks for looking at it. I will do more investigation.There are two water pipes atop each WH. What should be the hot out of the right tank is feeding the cold input of the left tank via that copper pipe.
It may be that whoever hooked up these tanks piped them backwards.
It looks like the hot water recirculation can be stopped (or tuned) with those two black-handled valves. You should unplug the recirculation pump if you want to close those valves during your investigation.
thank you so much Dave! I think I understand how it works now after your explanation. yes you are right the pipe on the top of left tank is the hot water output, and the pipe on the drian port of right tank is for recirc.Run some hot water in the house, and touch the left pipe on the left heater. It will be hot, since that's where the hot water comes out.
The pipe going into the drain on the right heater may also be hot, but it is a recirculation line, which pumps cooling water from your hot water lines back into the water heater at the bottom of the tank so it can be reheated (Hot water rises. Cold water is delivered to the bottom of the tank.). The recirculation pump is that thing on the pipe to the left of that wall outlet.
Turning the gas off on the right heater will just turn it into an expensively plumbed storage tank, while the left tank will do all the heating.
Leaving two tanks would make for an inefficient system, especially with that recirc line. I would recommend having a plumber come in, and disconnect the left tank, and repipe for a single tank.
This is awkward, but...
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