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Old 11-12-2012, 11:01 PM   #1
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


Hey all - new the the forum. Was reading about low water pressure for hot water and lots of folks recommended draining out the tank. I did this a few times and did find quite a bit of small rocks/debris.

That said, after shutting off the water supply to the tank and turning it back on, it seems to correct the water pressure issue for hot water. A few days later the dreaded low pressure comes back. When I cycle the water tank again (ie, turn off the water supply to the water tank for a few minutes and turn it back on), I get pressure again for hot water.

Any thoughts on what the issue is and what steps I should take to correct the root issue?

Thanks in advance.

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Old 11-12-2012, 11:14 PM   #2
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


Old steel pipes?

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Old 11-14-2012, 10:57 PM   #3
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


no steel pipes here i think its copper. anything I should look for or look into?
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Old 11-15-2012, 06:22 AM   #4
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


You might have a build up of small particles/sediment from your flushing that have worked their way up to the fixture valve body.
Take it apart and clean it out.
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Old 11-15-2012, 06:55 AM   #5
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


Sometimes there are check valves at the hot water tank inlet and outlet, intended to prevent eddy currents in the water from losing heat in the piping just above the tank. These could malfunction or become clogged with sediment. Some folks don't install them, but removing them is not that simple.

These check valves are not readily identifiable; if present they are incorporated into the first short pipe segments (nipples) screwed into the tank.

Turn off the water heater heat before draining any significant amount of water from the heater, and have a hot water faucet gushing water upstairs before turning the heat back on.
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Last edited by AllanJ; 11-15-2012 at 06:58 AM.
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Old 11-15-2012, 07:37 AM   #6
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Low water pressure (hot water only) - temp fix when I shut off water supply to tank


Is the low pressure at all fixtures?

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