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Old 11-01-2013, 02:34 PM   #1
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Help - Very low pressure in hot water

Woke up this morning to almost no pressure in all the hot water faucets. Just a trickle. The water is still hot. Cold water faucets are working as normal.

No sign of a leak. I'm plugged into a 1,200 gal water tank here on the ranch and the pump is working fine. Pump isn't coming on like I would expect if it was trying to make up pressure for an undetected leak.

Last night the temp was only in the low 40s, so nothing is frozen.

What could be effecting pressure just in the hot water?

Ideas?
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Old 11-01-2013, 03:00 PM   #2
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Is your 1200 gal water tank hooked up to the city water connection? Have you tried to use the pump with just the unit storage tank only? Taking off the 1200 gal connection. The city water will by-pass the 12volt pump. then it only works on the 1200 gal pressure. to fill the water heater and such. It sounds like you are not getting water into the heater.
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Old 11-01-2013, 03:09 PM   #3
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Possibly a bad check valve on the supply line out of the water heater. If it's stuck shut, you'd only get a trickle and then possibly nothing at all.
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Old 11-01-2013, 04:43 PM   #4
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Originally Posted by gljurczyk View Post
Is your 1200 gal water tank hooked up to the city water connection? Have you tried to use the pump with just the unit storage tank only? Taking off the 1200 gal connection. The city water will by-pass the 12volt pump. then it only works on the 1200 gal pressure. to fill the water heater and such. It sounds like you are not getting water into the heater.
My water supply has no city hook up. The water for my 1200 gal tank is trucked into my ranch on an as needed basis.

I must be getting water to the water heater otherwise I wouldn't be getting even this trickle of hot water from the faucets, right? I'm thinking the problem is somewhere after the water leaves the heater and before it heads to individual faucets...
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Old 11-01-2013, 04:49 PM   #5
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Possibly a bad check valve on the supply line out of the water heater. If it's stuck shut, you'd only get a trickle and then possibly nothing at all.
Sounds like a good possibility since it seems like the problem has to happen right out of the heater to effect every faucet the same.

I'm a newbie at all this. How does the check valve function and what would cause it to suddenly get stuck closed? And where is it in this system?
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Old 11-01-2013, 05:00 PM   #6
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If you have a single valve bypass system, it would be right there at the output side (hot) of the water heater. If that picture is your heater, it's different than what I am thinking of though. If you turn water pressure off, and drain the hot water heater, you should be able to loosen the lines and see if there is a check on either or both. The check valves are a cheap thing to try at least
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Old 11-01-2013, 05:23 PM   #7
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My water supply has no city hook up. The water for my 1200 gal tank is trucked into my ranch on an as needed basis.

I must be getting water to the water heater otherwise I wouldn't be getting even this trickle of hot water from the faucets, right? I'm thinking the problem is somewhere after the water leaves the heater and before it heads to individual faucets...
I do understand that, but your tank was supplying water to the connection that says city water with a hose or you would have to be on tank water from your holding tank and then you pump would be involved, other then that the water pressure either from a tank or city water creates the pressure in the system. It is either one or the other. I know of no check valve in the system after the hot water heater.... Good luck. If your trailer tank is full try just the waterpump and see if that works. That would feed the hot water tank and the cold water side then. You can also open your releaf valve and see if you get any hot water out, just do not get BURNED doing it.
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Old 11-01-2013, 05:30 PM   #8
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I do understand that, but your tank was supplying water to the connection that says city water with a hose or you would have to be on tank water from your holding tank and then you pump would be involved, other then that the water pressure either from a tank or city water creates the pressure in the system. It is either one or the other. I know of no check valve in the system after the hot water heater.... Good luck. If your trailer tank is full try just the waterpump and see if that works. That would feed the hot water tank and the cold water side then. You can also open your releaf valve and see if you get any hot water out, just do not get BURNED doing it.
Gotcha. Thanks!
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Old 11-01-2013, 06:19 PM   #9
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Gotcha. Thanks!
Are you really a REV? Or is that just a nickname?
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Old 11-01-2013, 06:28 PM   #10
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Gotcha. Thanks!
I would shut the water off, drain the water heater and disconnect all hot water lines to inspect for debris. While you have the water heater empty, check the anode. I suspect it to be gone and the debris in your lines.
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