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10 Ltr ariston water heater. I fitted it with a pressure relieve valve and exspansion vessel as instructed. It heats the water and works fine, BUT it continually lets cold water run into overflow?

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Your relief valve is not seating peoperly. Replace it.

Posted on May 08, 2017

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Alpha cd28c boiler loosing water and pressure through pr valve when heating is on,and when then switched off needs repressuring to use heating again.no obvious leaks.new pr valve been fitted.pressure


I assume losing pressure through the PR means Pressure Relief Valve (PRV) or temperature pressure (TPR). Open in TPR may mean boiler is overheating/overpressurized. Open in PRV means the Pressure Reducer/Fill Valve in the fill line of the boiler is broken.
House Water Pressure in a home is 30/40 PSI min to 60-80+PSI max.
Boiler PRV/TPR are set at 30 PSI open (SYSTEM PRESSURE) so too high a house water pressure will open the PRV/TPR. Replace the reduction regulator on/in the fill valve assembly

Oct 20, 2014 | Water Heaters

1 Answer

Hi my vaillant combi gives hot water for only 15 seconds then runs cold turn the tap off, run the water again & gets hot then runs cold some told me it might be the diverter valve can any body help...


yes it is your expansion vessel it sounds under charged to me?your expansion vessel needs to be recharged to 1 bar at least,but check manufacturers instructions it could state different.if the heating is fine and your getting hot water in intervals your diverta valve is moving and working?

Dec 11, 2012 | Water Heaters

1 Answer

I have an ariston 20/24 mffi combi pressure rises when switched to central heating but pressure ok when asking for hot water ? expansion vessel ?


over heat limit stat on central heating circuit ? if hot water is ok and hot to temp when run for 5 minutes the expansion vessel is doing its job.remember hot water is the maximum demand for any boiler ,,heating is secondry?once you establish hot water at maximum rate then the only real problem is on you demand for heating??

Dec 10, 2012 | Water Heaters

1 Answer

I have an Atwood water heater G6A-7E, heater heats up but no hot water flow after 15 seconds...Flushed system with water and air, put water to it and the hot water flow stops after a few seconds....


First check that any by-pass valves are in proper position. Remember, cold water has to enter in bottom fitting at back of tank, and hot water comes out at top fitting. Thus any valves that may be there, need to be in open position, and any valve between those 2 lines will need to be closed. If all valves are in proper position and working as they should, I would suspect you have a faulty check valve between top (hot) line fitting and tank. One easy way to check that before replacing it, would be to shut incoming water source off, whether running off pump or hose attached outside. Then relieve all pressure in system by opening taps until all pressure is gone. Now, go outside and open pressure relief valve carefully ( in case it's hot ) and make sure pressure is relieved there as well. Now, carefully hold pressure relief valve open while you have someone turn water back on, and see if you get good flow from pressure relief valve. If you get good pressure coming out of there, that tells you your tank is getting full, and you have water coming in as needed, so problem has to be on hot side ( top fitting ) and/or onward from there, which would be check valve fitting at top next to check. Remove the check valve and If you don't have a new check valve to try it, just put a short galvanized 1/2" pipe nipple in there for now if needed and that should do it, just attach your fitting directly to nipple. Before you do this, make sure you have removed all aerators etc on taps that may be plugged and tested pressure that way as well just in case. I have seen all of them plug up at same time before. If you remove them and get good pressure, then problem solved.

Nov 06, 2011 | RTO Atwood Water Heater - 6 Gal LP

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I have a leak coming from the "cold" line right at the valve joint. There is signifigant calcuim build up on the pipe from the valve to the connection of the water heater, (maybe 8 inch of pipe)...


Very simple - call a Plumber. He will fix your plumbing problem, and any foreseen potential problems related to your water leak. He may also suggest replacing your 6 year old water heater. Of course ..... for a professional cost.
However, depending on your time, skills, proper tools, patience and luck, it's easy enough to perform yourself:
1. Switch off the water heater Breakers (220v) in your service panel.
2. Turn off the water supply to the water heater.
3. Attach a water hose to the drain faucet. ( a good time to flush sediment -calcium deposits)
4. Open a hot water faucet to vent (above the level of the water heater drain - kitchen sink)
5. Remove the suspected leak components. (a union connection is a good place to start)
6. Install New pipes -3 wrap all male threaded ends with teflon Tap. Tighten securely - using 2 wrenches.
NOTE: Before refilling - you can turn on the water heater supply valve for a few minutes, to flush out any lingering calcium debris.
7. Shut off drain valve - remove hose. Shut off venting hot water faucet.
8. Turn on water supply valve to fill water heater.
9. Open a hot water faucet to relieve air pressure while filling - preferably the bath tub faucet, it doesn't have a screen that might clog.
10. When water flows without air - shut off tub faucet.
11. Look for leaks.
12. Switch the water heater Breakers on.
Note: 50 gallons should take an hour or more to heat up. Turn on a hot water valve momentarily within this heat up time to relieve thermal expansion. ( the PT valve on your water heater will perform this task if pressures/temperature exceed new water heater tolerances - it's just a precaution to introduce these fluctuating pressures on your fragile 6 year old unit)

These are just basic instructions - assuming you fill in the common sense and work safe steps.
Good Luck - The Skill will only come after trying.

Mar 05, 2011 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

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

1 Answer

I have a worcester 28cdi combi boiler. The pressure keeps going up yo 3 bar when the heating is on, and venting of via the pressure valve. When the boiler cools down the pressure drops to zero, and I have...


Your boiler has an expansion vessel that is like a bladder full of air. Yours has lost it's air pressure. Check your manual for this vessel and where the valve is to re-inflate it and what pressure to inflate to. It should have a simple tyre valve, pump it back up (usually to about 1 bar after releasing the water pressure) and should be all fixed. If you can't re-inflate the bladder is holed and the expansion vessel will need replacing.

Dec 05, 2010 | Water Heaters

1 Answer

Pressure relief valve


The pressure relief valve only leaks when there is excess pressure in the system, possible causes could be excessive static pressure, overheating, faulty pressure vessel or undersized pressure vessel.

Apr 11, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Too much water draining from Vulcan Electric H/W relief valve.


Dear Julie. Do you have an expansion tank installed? If so it is probably waterlogged. If you come home shower etc. use lots hot water then go to bed or leave the cold water in your tank heats and expands as it heats. In the old days a toilet ballcock valve would relieve this pressure but modern toilets with diaphragm valves wont so the pt valve relieves pressure. Installing an expansion tank on the cold water line near the heater will absorb the extra water & stop the pt valve from activating.

Dec 29, 2009 | Water Heaters

1 Answer

The pressure drops very slowly over a month then needs topping uo from the filling loop to 1.5 bar. when the heating is on it goes upto 3 bar. the pipe outside is slightly damp. it was fine during the...


Sounds like the expansion vessel in the boiler has lost pressure or is faulty. If you have a tyre pressure gauge, locate the expansion vessl and check the pressure via the schraeder valve. It should be around 1.5 bar. If there is no pressure you can re pressurise it with a bicycle pump. Should it not pressurise then you will need a new one. The pressure relief pipework outside is damp because the system is over pressurising at relieving pressure at 3 bar. This obviously causes a system pressure drop. You can install a pressure vesel into the heating return pipework should accessing the boiler be difficult.

Oct 31, 2009 | Water Heaters

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