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Water pressure very low when running the hot water

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  • Richard Perkins
    Richard Perkins May 11, 2010

    I am guessing this is a combi-boiler, and not an AC unit.



    If this is the case, then it is probably the heat exchanger that needs replacement. They furr up like kettles do, and will eventually stop the water supply. If your kettle has a white deposit in it - this will be far worse in the boiler.



    After fitting a replacement, you can add a system to prevent limescale build up.

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Check to see if the pressure has dropped on the cold tap if so then the main pressure to the house is low. try opening the main valve to the house a bit more it may be partially shut.if the cold pressure is higher check to see if the water tank is filling properly .

Posted on Mar 26, 2009

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Posted on Jan 02, 2017

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No hot water pressure in kitchen, low cold pressure


sounds like a bad faucet//only if you had good pressure before it was installed..to cheaply test..take the hot water off from the shutoff valve and spray it into a milk jug to see if theres good flow..then replace the faucet assmbly..dont forget to turn off the shutoff valve first..or you will get a watery surprise!

Jan 08, 2014 | Home

1 Answer

I have a problem with low hot water pressure can you help would an elec shower help


1) If possible, it is Best to solve pressure problem before installing new shower.
http://waterheatertimer.org/Low-hot-water-pressure.html

2) If the cold water has good pressure, then Electric shower could fix problem ... but shower would have to be connected to the cold water line and not the hot.

3) Seems the expense of adding a electric shower would be greater than having plumber fix low hot water pressure.
Assuming you have access to plumbing pipes, and this is not apartment building.

Jan 05, 2013 | Water Heaters

1 Answer

Water pressure decreases as the water runs


Probably a clog in galvanized pipe.
Expansion tank is not whole-house pressure regulating tank. It is localized protection for plumbing exposed to high pressure caused by very hot water.
If you house has pressure regulating valve, then that can be a cause.
For low water pressure in household, the following link might help:
http://waterheatertimer.org/Low-hot-water-pressure.html

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1 Answer

Our rheem pronto tankless rutg-74xp red light will come home indicating hot water and stay on about 2 minutes and then turns off we have turned off and back on and let water run for 5 minutes and will come...


Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

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1 Answer

We have a new Price Pfister 49 Series bathroom faucet set with two handles. Even with the hot water tap open full the water just dribbles out


If you have full pressure on the cold water side and low pressure on the hot side then you well need to remove and clean or replace the cartridge for the hot side. If you have low water pressure on both sides try removing the aerator and cleaning it.
If you need to replace the cartridge on the hot side do both sides while you at it.
Whenever you work on any faucet before you turn the water on remove the aerator and run the water for a few seconds then replace the aerator.

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2 Answers

No hot water when heating tempreture reached.flow switch is operating, power at flow switch terminals on pcb (three wires),? but when working hot water runns for ever and heating runs ok too untill the...


I have a triton opal shower.

I turn shower on low pressure and cold water. then no low pressure and piping hot water for a very short time then low pressure and cold water.

I've changed the solenoid and the little black plastic ball.

Help !

Aug 21, 2009 | Water Heaters

2 Answers

Low pressure on hot water taps and showers


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.

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1 Answer

Need portable DW but have low hot water pressure in apartment


all dishwashers i am aware off have their own heater and are better connected to cold not hot water

Jun 26, 2008 | Dishwashers

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