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Water pressure What water pressure (bar) is normal for a domestic home?

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I take it you are asking about a combi boiler typical pressure 1-2 bar

Posted on Jul 13, 2009


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Leaking coolant in my 1997 royal star,how do i trace the sources and quickly repair. I have 2000ks to get home

If the pressure cap is not holding pressure, it is allowing water in the coolant to evaporate. It can also let the engine overheat as the pressure raises the boiling point of the coolant to around 250 degrees F. Without pressure the boiling point is much lower, bubbles form reducing circulation and allowing local engine overheating.

Assuming the coolant is not getting into the oil,go to an auto parts store and buy a bottle of "Bars Leak", the one with dehydrated vegetable fibers in water soluble oil, it looks like dark liquid with lumps. (Under no circumstance ever use anything with aluminum flakes in it, even though Bars Leaks makes one like that too.) Stir it up well and use maybe 1/8-1/4 of the jar, at most in the cooling system and top off the coolant. (Or follow Bars Leak instructions) Run the engine to fully warmed up, drive it around and the bars Leak will usually plug the leak. It works by the fibers gathering in the leak, as the water soluble oil dissolves and the water gets to the fibers, they swell up and make a "permanent" repair. Watch the coolant level and engine temperature on your ride home.

bBars Lea

Jul 27, 2017 | Motorcycles


Valve Pressure Reducing or Pressure Reducing Valve

dfef4ee.jpgThe pressure reducing valve on a boiler is the way that the water pressure in the boiler is controlled. The standard pressure for many hot water boilers is considered to be 12 PSI. To keep the boiler pressure at or near the 12 PSI mark a small valve is used for pressure reducing. Most domestic water systems run between 20 and 60 PSI, so the pressure must be reduced for the boiler.

This pressure reducing valve is installed in the pipe that goes from the domestic cold water to somewhere in the piping on the heating system, usually at or near the expansion tank. The valve is mostly maintenance free but will create some problems at times. Some of the things that can go wrong are:

  1. The valve seat can get dirt stuck under it causing water to leak by and increase the pressure in the boiler, causing the relief valve to release water periodically.
  2. The valve can become plugged with dirt causing the boiler to not have enough water pressure, which will cause circulation problems with the boiler pumps.
  3. The valve can leak causing a mess around the boiler area.

Replacement of the pressure reducing valve is not difficult if the installer strategically placed manual valves so that the reducing valve can be isolated from the rest of the system for replacement.
If the water pressure reducing valve fails in any way, it is usually best to just replace the whole valve rather than trying to repair or fix it. I have tried a number of times with only temporary results. These valves are not a high dollar item and the time it takes to fix them is not worth it.

on Dec 23, 2009 | Heating & Cooling

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My boler will heat the hot water & heating but not the hot water on its own

This is possibly because you have a zone valve that has stopped working, motor maybe burnt out or could be that it is permanently open . Some valves have a manual control that clicks into position, these valves are usually placed adjacent to your hot water cylinder
Hope this helps

Jun 22, 2015 | Heating & Cooling

1 Answer

What operates the water tap on the draw bar, is it 12/240 volt or mains pressure water, thanks

normally the pump will be 12 volts working from a 240v transformer. If it is a pressure system then it will come on as soon as the pressure is lowered ( turning on the tap)

Mar 16, 2015 | Cars & Trucks

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Domestic hot water works but no hot water to baseboard heat

If its a one story house, the system pressure should be somewhere around 10 to 12 psi. There should be a PRV (pressure reducing valve) on the domestic water line supplying make up water to the boiler. The shut off valve in that line should be in the open position unless the prv leaks through and slowly overpressurizes your system to the point of tripping the pop-off valve. If so, then the manual shut off should be kept closed then opened only to boost the pressure up a bit in the system. It kinda sounds like you are suffering from low system pressure.

If there is a vent or vents in the system, try bleeding them into a coffee cup and you may find it sputtering air/water mixture. Bleed them until you have full water flow and make sure you keep approximately 10 psi in the system.

Oct 07, 2014 | Cadet Manufacturing Heating & Cooling

1 Answer

Uberhaus 75175006 shower column has very low hot water pressure

The shower head may be clogged with debris.

Nov 09, 2013 | Home

1 Answer

Simonelli premier maxi gauge

I have exactly the same problem please help us

Feb 01, 2013 | Nuova Simonelli Premier Maxi Espresso...

2 Answers

My worcester bosch 24i junior pressure keeps dropping if i have heating off for an hour i have to top up boiler and reset also when i have heating on the pressure jumps right up to over 4.0bar

When water is heated it expands. To deal with this all boilers are fitted with a small expansion vessel which is like a reservoir which holds the excess water.

This expansion vessel is like a balloon in a metal pot. When the water goes in the metal pot the baloon squashes a bit to make room for the extra volume of water. When it cools the balloon pushes the water back into the heating system.

What has happened is your expansion vessel no longer works. When the water heats up there is nowhere for it to go so the pressure jumps up to 4 bar. The Worcester boiler lets high pressure water escape (most boiler allow this to go through the safety valve at say 3.5 bar).

When the water cools the pressure drops very low as the volume of water contracts.

The problem is your expansion vessel - normally a little red painted metal cylinder inside the boiler.

Dec 22, 2010 | Bosch Water Heaters

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