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Old 12-25-2009, 04:34 PM   #1
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Low Hot Water Pressure

We just bought a house, we found out beforehand the water pressure was low, but when we moved in we realized it was only the "HOT" water. The Hot water pressure is extremely low, we have to go next door to take showers because its absolutely useless. I have heard that you have to check the cold water inlet on the water heater for leaks or clogging, but the valves are under the house and there is snow on the ground, is there any other possible causes? Thanks.


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Old 12-26-2009, 04:12 AM   #2
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Old galvanized steel supply pipes, if you have them. These are notorious for scaling up inside over time until they eventually shut off the water. The only solution is to replace them (recommend PEX).
Also, if there is a valve on the cold water supply pipe at the water heater, make sure that it is wide open. Usually, the water pressure into a heater tank equals the water pressure out unless there is a supply pipe problem.
Or it could be a problem with the tub/shower faucet itself, if that is the only low pressure fixture.
Good luck!


Last edited by Mike Swearingen; 12-26-2009 at 04:15 AM.
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Old 12-26-2009, 10:44 PM   #3
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Agree it's probably scaled pipe, but I had a situation where the pipes were ok and still couldn't get good pressure above the second floor. Finally put in a low pressure circulating pump and a flow switch where the hot line split off from the incoming supply. When a hot faucet opened, the pump kicked in. It gave just enough of a boost to work when nothing else did. I was afraid of getting some kind of blast when the pump kicked in, but it didn't. Still something to watch out for if using a higher pressure pump.
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Old 01-04-2010, 02:32 PM   #4
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How old is it, is there any debris in the faucet filters or water coming into the tub? The dipstick might have eroded and clogged your system - this is currently happening to me.

My pressure isn't useless yet so I've been putting off a solution. Don't know what to do.
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