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Water boiler squirting water out of the valve in the right hand side of tank

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Hi the pressure in boiler is very high and dripping out side its not the water valve intake been told its the heater exchanger

There should be a water pressure reducing valve in the make up water line. This valve or regulator should keep the boiler pressure at about 10- 12 pounds. It sounds like that valve is letting more pressure to the boiler than it should. There is also an expansion tank that works to keep the boiler pressure at 10 pounds. The rubber seal inside can go bad and the tank will fill with water.

Feb 27, 2015 | Water Water Heaters


Expansion Water Tank Boiler Expansion Tank

d186d4f.jpgWhen water is heated the water will increase in volume. The thermal expansion tank in a boiler heating system is there to allow the extra volume of water some place to go. It also holds enough water to fill the void back up when the water cools.

The water expansion tank is a necessary item in heating systems. It also can cause problems if they do not work correctly. Some of the problems caused by a faulty expansion tank are:

  1. The boiler relief valve will be constantly dripping or blowing off if the tank is totally full of water and does not have the air cushion needed to counteract the increased volume of water as it is heated.
  2. Air can be introduced into the system if the tank does not hold sufficient volume of water to keep the system full as it cools.
  3. If fresh water is introduced into the system frequently the tank will rot out from the inside out.

One of the main things to remember is that a faulty boiler expansion tank can make other things like the relief valve look faulty when it reality it is not the problem. A bad expansion water tank or a bad pressure reducing valve can make the relief valve look bad. Or actually cause it to need replacement. Check everything out carefully before deciding what pieces need to be replaced. If go about just changing parts without a through investigation first you may be changing parts for a long time till you find the right one.

on Dec 23, 2009 | Heating & Cooling


Boiler Leaking Water - The Boiler Leak may not be the boiler

Went on one call today and had another query by Facebook about this so I though why not write an article about it. Both persons were very concerned as they saw water dripping from theirs boilers. A closer inspection for both showed that it had nothing to do with the boiler its self.

There are many things that can make water leak from your boiler. If you know for sure that the water is coming from a hole in the sections then you may have a serious problem. Usually though there is an easy fix for that also, more on that in another article. Both boilers today were leaking water from the relief valve.254c728.jpg

This valve is design to relieve the excess pressure from the boiler in case of a build up of extra pressure in the boiler. The extra pressure can come from a number of different things. A few of the causes may be a bad expansion tank, a bad fill valve or pressure reducing valve, or an open bypass valve. The bypass is easy, just close it and relieve the extra pressure. The others are not as easy.

Your expansion tank is simply a tank that allows water from the system to go in and out according to the pressure in the system.610ab3c.jpg This tank contains about ½ air which acts as a cushion to absorb the extra volume of water that is created as the water is heated. Hotter water takes up more space or volume, so it needs a place to go to when it is heated. If the expansion tank is totally full of water then, it will push water out of the relief valve. Changing your expansion tank will fix the problem.

If the reducing valve or fill valve is leaking by then you can also get extra pressure in the system.8e5ccb4.jpg A normal heating system will only run 10-20 psi pressure. Most well systems or city water is way higher than that. If the pressure in your boiler gets over 30 psi then it will begin to relieve the extra pressure by dripping water.

If you have a drip from your boiler this is what you check. First the expansion tank, the reducing valve, and the bypass valve that bypasses the fill valve. This valve is usually installed to quick fill the system, or purge the water lines of air.

Often there is just a small problem that looks like a big problem. Do not get excited and methodically check through the possibilities. You will usually find that the problem is not nearly as bad as you first thought that it was.

on Dec 06, 2009 | Heating & Cooling

1 Answer

I've got an unvented indirect heating system, and I've just lost hot water to the tank. Am I right in believing that the problem will either be the actuator/valve coming up from the boiler, or possibly the...

turn the water stat up to see if valve opens , you can take head off and open valve by hand ,check pump is not hot pump could be stuck , if you turn stat up and down with the head of the valve you will see if it is opening

Dec 03, 2010 | Heating & Cooling

1 Answer

Empty boiler

Turn main water off to the water heater, it may be a valve on cold side coming in to shut off. Next turn power off to the heater and drain the tank the drain will be located near the bottom of the tank.
You will need a water hose to connect to the drain to run water outside. Open a faucet hot side to allow you to drain the tank.

Upon reinstall connect the tank up and fill tank and open up hot side on one faucet at a time to purge out air from system before turning power back on. Make sure you have water flowing from each faucet's hot side before turning power back on.

Jul 02, 2010 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have a Vaillant 624e boiler. I keep losing pressure. Then sometimes it shoots up to maximum. The pressure relief valve is also dripping sometimes. I am told it may be the expansion tank. Where is this...

The expansion tank is located on the header leaving the boiler. If it is a newer style than it will be a cylinder, most likely hanging above the boiler. It will have a valve on the bottom of the tank that looks like a tire or bicycle valve. If you put an air gauge on the valve stem it should read 12 psi, if it reads more, say closer to 30 psi, then the bladder is broke, and it should be replaced. If there is less than 8 psi, then there is probably a slow leak and the tank should be replaced. If it is an older expansion tank, it will most likely be mounted in the ceiling of the boiler room, it will be a large steel cylinder, that is piped into the boiler, and should have a drain valve on on side of it. If this is the case, connect a hose to the valve, and allow all the water to drain from it. This should solve the problem if it is your expansion tank. Hope this helps.

Apr 03, 2010 | Water Heaters

1 Answer

Hi There, I have an Ideal Response 120 Combi Boiler. Each day the water pressure falls to 0 on the pressure gauge. In order to get hot water and Cental Heating I increase the pressure to 1.5. The Hot water...

I have the same boiler with a similar issue. The water is more than likley leaving the system from the pressure relief valve, which will be routed outside. It sounds like you have lost the pressure in your expansion tank, which is inside the boiler. With the boiler pressure at zero and the power isolated, the expansion tank can be accessed from a panel at the top of the boiler on the right hand side. You will see a valve on the red expansion vessel like the one on a car tyre and can be pressurised with a car tyre air pump. I think from the manual the pressure should be about 1 bar, but it depends on the length of pipework on your system. A competent boiler engineer should be able to sort this out, but it may be that your valve is leaking, or the expansion vessel has failed and the problem will occur again.

Nov 10, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

My vokera linea 7 boiler is loosing water through over flow pipe while heating up to temperature

The pipe you call over flow. This would be the P/R valve and is set to relieve pressure in system. The first thing that needs to be checked - the expansion tank two types of tanks one would be what is know as a extrol tank, Most likey just hanging off pipe, it has air pressure on one side of rubber dia. and boiler water on other. The 2nd type is just a tank at ceiling height (most of the time). You would see a hose bib off the one end. Tank holds some water but must have air for boiler water to push into as it is heated. If you have the first tank it should be replaced. The 2nd type needs to be drained of all water. Shut off feed line to tank hook up short hose and drain into a bucket. if water stops you must break the vacuum raise hose above tank air should go into tank. repete draining till all water is out of tank. Some tanks have a way to open a valve to let air in as you drain if so use it. When all water is out of tank valve off everything (no air should leave tank) Open back up to system now you should have aplace for the water to expained to.

Nov 04, 2008 | Heating & Cooling

4 Answers

Baxi combi boiler 80e safty thermostat light on

baxi boiler relief valve blows off when heat is turned on when hot water is working it is fine

Oct 15, 2008 | Protech Systems FasNSeal FSWMKE4 4" Vent...

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