Question about Rheem 50 Gallon FVR NATGAS Water Heater 6YR 22V50F1

2 Answers

Low pressure on hot water taps and showers

Hot water pressure very low , taps and showers only run as a trickle . Cold water runs as normal

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  • bostock3 May 24, 2009

    the house is only five years old, have drained water tank and refilled .
    Pressure still low


  • badenhop
    badenhop May 11, 2010

    New or old construction? New or old pipes? What kind of pipe? What kind of valves?

    If you've hooked a new water heater up to an existing system, especially if it's steel or "black iron" piping, odds are you have mineral deposits somewhere, or everywhere, in the line that are severely restricting flow. (running into that in my present abode) If you've double-checked and all of the valves on the hot water line are fully opened, the bad news is you'll need to replace the pipe.

    If it's and old heater, try flushing the water heater out through the drain at the bottom. If it's full of sediment, that may solve your problem for quite a while.


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Many states building codes require a pressure regulator and expansion tank for hot water heater installation. Check the pressure regulator if you have one as this would only affect the hot water pressure. Adjust or replace. Rap the expansion tank like knocking hard on a door. Hollow sound is good. Dull thud means it needs to be replaced as it is filled with water.

Posted on Jun 24, 2009

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There are a couple of things that tis could be,. the cold water valve going into the heater could be bad or not open all the way or your plumber could have heated the connectin to hot and melted the tube, in which case you need to cut the hot side pipe back off take the adapter off and see if the plastic tube is either melted or has a ball of solder on it

Posted on May 29, 2009

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Posted on Jan 02, 2017

gary1121
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SOURCE: hot water taps and showers pressure very low cold taps ok

there is a little cap on the hot and cold side above the shut off valves, turn the water off at these valve and take the caps off there are filters in there clean them off and reinstall them that should take care of the problem, you might want to flush the tank while your at it hook a hose to the hot side connector and run it out side or to a sump pump then turn on the cold water and flush it out you can also reverse this procedure by doing it on the cold side

Posted on May 29, 2009

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http://waterheatertimer.org/Low-hot-water-pressure.html

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You might have clog in water lines.
If shower is only place where low pressure exists, then clog is probably at shower valve.
Disassemble valve and see if clog will flush out.
From there, you have to keep moving back along cold water line looking for pipe filled with sediment or elbow that has obstruction.

If pressure problem is bad at every cold tap, but doesn't affect Hot water, then clog is inside Cold line somewhere after water heater connects to cold line.
Buy a pressure gauge that connects to water hose.
Buy adapter that also fits pipe thread.
For example Brady BTG 100.
Test outdoor spigot for baseline pressure.
Open cold tap inside house and see how much pressure drops.
Close cold line and open hot tap and see how much pressure drops.

Next, move pressure gauge along cold water line.
Take apart pipes and inspect for obstruction at elbow or pipes filled with sediment.
Look for any place galvanized pipe connects to copper pipe, since this will be likely place for obstruction because of bi-metal corrosion.

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