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Low hot water pressure throughout household, water pressure on boiler above 2 and neighbours water pressure all fine, please help

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  • Anonymous Mar 16, 2014

    Too much household water pressure

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Could be a couple of problems. If an older water heater the inlet a/o outlet nipples could be corroded or limed up closed. If a newer tank, the "Pith balls", which are energy saving devices, could be jammed in the inlet or outlet nipples of the tank. Try opening the drain valve. If you have good pressure you can eliminate the inlet pith ball as being your problem. Usually it's the outlet one that jams closed. Either problem will mean a call to your local service provider but if your so inclined you can remove and replace these items if a supplier is near by.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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2 Answers

Why can't i fill my boiler


You didn't specify what kind of boiler you have. Some low pressure steam boilers have a manual fill valve as well as an automatic float switch valve. Hot water boilers have a pressure reducing valve that constantly monitor the boiler pressure and maintain 12 to 18 PSI for the safety of the boiler. If the boiler runs out of water there is a good chance it will rupture and become unrepairable. If you are saying your boiler won't fill, and its a hot water boiler, the pressure reducing valve is probably blocked with sediment and needs replacement. The valve is in the water line that feeds directly into the boiler return line from city water. Hope this helps.

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1 Answer

I have a vaillant eco pro 28 combi boiler. no constant hot water unless tap is on really low.


Oh some of these there was a small black heatexchanger just for hot water they some times block up . or it could be a blockage in the water section where it flows in .I know Valliant have a very good tech line and fitters who do house calls .

Mar 02, 2017 | Water Heaters

1 Answer

Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"
this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

Feb 02, 2013 | Water Heaters

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

Boiler recycling when in DHC mode and water alternates hot then cold, back to hot every few minutes. Could it be pressure / flow rate.


First check pressure over 1 bar ok then-
1. check flow - is it adequate - a little less than the cold tap ok then -
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If answers are 1. no but 2. yes then check for a furred up secondary heat exchanger
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1 Answer

Boiler Venting.


There cannot be controlled venting of the flue , the products of combustion must have free flow to escape , The heat exchanger is above the burner which heats the water if you thinks this is high then maybe you a pressure problem . Or contact the makes tech line and ask them what they think the consumption might be for you heater .You may find this on google

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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 !

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1 Answer

Boiler keeps losing pressure when the heatings off


Hi Leehardcast,

Yes the problems are related. The system is low on water. So now instead of water you have air in radiators which is easily compressed when it heats up. Then pressure loss when it cools down.

Add some water to your system until you have 15lb pressure and bleed out upstairs radiators at the same time.

Please rate this response and Good luck, Phil

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