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Mar 18 at 21:15 comment added Jim Stewart If the heaters really are in parallel, it should be easy to determine if only one is working. Without turning on any water check to see if both WHs are hot at access points, e.g., at the hot outlet or at the drain valve or the PT relief valve .
Mar 18 at 21:07 comment added Jim Stewart When you say the two are in parallel do you mean that both WHs contribute hot water to every hot water delivery point in the house? This would never done in original construction AFIK, but with a remodel maybe. First thing would be to see if this is the case. This should be easy to check. Does each heater have a shutoff valve for the cold water inlet? Shut off the inlet to one of the heaters and see if you get flow from all the hot water faucets in the house.
Mar 18 at 12:24 answer added ratchet freak timeline score: 2
Mar 18 at 12:21 comment added Ecnerwal Can put a tempering valve right on the water heater, and set it hotter without scalding at any output. In any case, this does not seem to be set up in parallel, and it would be difficult to set it up in parallel (to work well) with the heaters on the opposite side of the house (at minimum there would be a long patch of cooled water in the pipe between them.)
Mar 18 at 11:44 comment added RMDman You could turn the temperature up on both tanks if you have pressure balance valves in the showers.
Mar 18 at 3:54 comment added Spanky69 They don’t connect, two separate branches. My farther in law said to make a slight restriction with the valve on hot water heater that is used more but not sure if that will work. Very odd setup,
Mar 18 at 3:07 comment added manassehkatz-Moving 2 Codidact Do the hot water pipes actually connect anywhere? Or are they two separate branches?
S Mar 18 at 2:02 review First questions
Mar 18 at 3:20
S Mar 18 at 2:02 history asked Spanky69 CC BY-SA 4.0