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Message
Hot water issue after replacing heater
Posted on 8/31/25 at 3:27 pm
Posted on 8/31/25 at 3:27 pm
Yesterday I replaced one of two hot water heaters- the setup is cold water running into the one I replaced then copper pipe into another (both 50 gallon) then copper pipe into a pressure tank (looks like a mini propane tank) then through a recirculator that makes hot water instant all through the house...after I finished, I tested several faucets and besides some air it seemed fine. This a.m. almost no hot water on all faucets and shower. I ran all the faucets, tubs, showers on hot and got more air out and it has fixed issue on most. However, im still getting only warm water in faucets furthest from the source, also still have air in some pipes. Pressure is good on one side of house and a little weaker on the other side. Any ideas?
4
Posted on 8/31/25 at 3:51 pm to hubreb
quote:you have air in your pipes
also still have air in some pipes
Posted on 8/31/25 at 6:27 pm to hubreb
Is this an electric heater?
Did you purge air before powering up?
If so, you maybe burned out one of the elements.
Did you purge air before powering up?
If so, you maybe burned out one of the elements.
Posted on 8/31/25 at 7:12 pm to ItzMe1972
Natural gas, purged air during filling
Posted on 9/1/25 at 6:41 pm to hubreb
quote:
Natural gas, purged air during filling
Not trying to bust your chops, but you even admitted still having air.
I’m not aware how it works with 2 systems like that.
Did you confirm both pilot lights are lit and both units are working?
Posted on 9/2/25 at 9:49 am to baldona
quote:
Did you confirm both pilot lights are lit and both units are working?
yes - have continued to try and purge air....but still very little hot water pressure on spickets furthest from tanks - and on other side of house great pressure but will not get fully hot...some spickets great pressure like it was and super hot
Posted on 9/2/25 at 11:42 am to hubreb
Might want to post a picture of what the plumbing connections look like, entirely possible you got something wrong.
Posted on 9/2/25 at 1:56 pm to Clames
quote:
Might want to post a picture of what the plumbing connections look like, entirely possible you got something wrong.
same set up i've had for 15 years, just replaced the first hot water heater in the line i originally described
Posted on 9/2/25 at 2:15 pm to hubreb
if it was working before and now it’s not the problem lies in the connections you made/remade and/or in your commissioning
check all of your connections
check all of your connections
Posted on 9/2/25 at 3:54 pm to cgrand
pocket of air cavitating the recirc pump?
Posted on 9/4/25 at 12:00 pm to hubreb
So, is your problem one of flow not being adequate or one of the war]ter not being hot?
Posted on 9/4/25 at 2:01 pm to Spankum
quote:
So, is your problem one of flow not being adequate or one of the war]ter not being hot?
both, depending on what outlet i'm using - upstairs great pressure and temperature, downstairs first three outlets closest to the tanks have great pressure and temp...next two low pressure and ok heat, then what i perceive to be next on the line has good pressure but worse heat - on the other side of the house - have decent pressure but heat is poor
it got more complicated this a.m. - yday i tried to use the pressure relief valve on both tanks to see if air was in them / the tank i did not replace would not close without me banging it with a wrench...then this a.m. the pressure relief valve was leaking at a pretty good pace and the burner/ pilot was out and i didn't have hot water (not sure why new one didn't feed into that) - ended up getting gauge fixed and heater re-lit...will see the situation this afternoon after work
Posted on 9/5/25 at 6:05 pm to hubreb
Man, you have a complicated system that is hard for me to envision! I suggest checking to see if there is not a valve partially closed somewhere or the inlet/outlet reversed on one of your tanks.
At any rate, the relief valve that you had to beat on needs to be replaced….if it wouldn’t shut off without beating, it probably won’t relieve in an over pressure situation.
At any rate, the relief valve that you had to beat on needs to be replaced….if it wouldn’t shut off without beating, it probably won’t relieve in an over pressure situation.
Posted on 9/7/25 at 1:45 pm to Spankum
quote:
I suggest checking to see if there is not a valve partially closed somewhere or the inlet/outlet reversed on one of your tanks.
Both of these were the issue, we had the water main in reverse order and a valve closed. Think the only reason I was getting any hot water was the recirculator
Posted on 9/8/25 at 6:42 pm to hubreb
What's the purpose of having 2 heater inline like that. Just don't want to run out?
Posted on 9/8/25 at 7:04 pm to Wilson
Its a 4,900 square foot house with 4 full bathrooms. It was started in 2008 builder went under in 2009 -10 house was supposed to be upgraded top level on premium lot backlog up to a couple ponds. I bought from a bank in 2012 unfinished and they had a contractor finishing and got it for <90 a sq foot..most upgrades were done by previous builder. Felt bad for neighbors, we were in for 250k less than them. No one to ask about plumbing or electrical though.
Posted on 9/8/25 at 8:32 pm to hubreb
quote:
the setup is cold water running into the one I replaced then copper pipe into another (both 50 gallon) then copper pipe into a pressure tank (looks
Don't know if this is your problem but the expansion tank goes on the cold water line before the water heater tank.
Posted on 9/9/25 at 5:21 am to weadjust
See above, your correct, that was the primary issue
Posted on 9/9/25 at 10:46 pm to hubreb
quote:
Both of these were the issue, we had the water main in reverse order and a valve closed. Think the only reason I was getting any hot water was the recirculator
Glad you got that fixed!
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