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expansion

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  1. K

    No water sound when turning filler tap by expansion vessel.

    Have an Ariston unvented hot water tank in airing cupboard with the red and white expansion vessels and a filler tap. As advised years ago on these forums when I hear that sound that the central heating water needs topping up I usually wait until cold so the gauge goes to zero and top up to 1...
  2. M

    Sizing expansion vessels

    Has anyone got a good rule of thumb for sizing an expansion vessel for a central heating system. A combi has a 8 litre vessel. And will deal with the expansion of say 8-10 rads. Could one use this as a ball park figure and multiply up from there Obviously pipe work to take in to account 22mm...
  3. H

    Pressure loss in Heating System post fitting new Expansion Tank

    Hi, hope someone can help me with a heating pressure loss problem. My valiant boiler has been loosing pressure over the last few months, resulting in me having to top up the water every week or so. Managed to get a boiler engineer to visit who diagnosed a faulty expansion tank. (Water evident at...
    • Hoppers
    • Thread
    • expansion fitting heating heating system pressure system tank
    • Replies: 26
    • Forum: UK Plumbers Forums
  4. M

    New expansion vessel on water system - is pressure too high?

    Hello all, I'm currently in Ireland and in a small cottage where the plumbing system has me scratching my head a bit. When the place was done up the builders decided that the tank in the loft was no longer needed and put a tank out back in a small extension where ALL (well, except for the cold...
  5. S

    Vaillant Ecotec Plus 832 Expansion Vessel

    Hi Guys, Had a quick question regarding expansion vessel on a Vaillant Ecotec Plus 832. Was servicing the boiler and upon attaching hand pump to vessle after having drained the boiler, returns and flows isolated and drain off on boiler open, the vessle showed 1 bar charge. Was wondering why...
  6. W

    Maxi Pod expansion tank

    I have a Maxi Pod installed and the overflow of the expansion tank keeps overflowing. i think it maybe because my expansion tank is to small. It is only a 7 gallon tank and I believe Maxi Pod recommend a 20 gallon expansion tank. Question: why do Maxi Pod recommend such a large tank?
  7. M

    Unvented cylinder problems - over pressure or faulty expansion tank?

    Hi, New to this forum and also complete novice who knows pretty much nothing about plumbing. However I have done quite some google searching trying to find some answers. I live in a 1st floor flat which uses an electric duel element direct unvented water heater cylinder (150 litres). Recently I...
  8. D

    Leaky Gledhill expansion relief valve

    Hi I have a leaky Gledhill expansion relief valve block a little like this one with the same spec 3bar on the black input and 4.5 bar on the red expansion relief value. It protects a 250L Gledhill unvented tank. All the input pipes have isolation valves so pretty easy to exchange components...
  9. S

    Hi all our boiler has just had a new expansion vessel fitted but pressure is still going to 2.9 bars when using central heating . Is this normal? Than

    Hi All our boiler has just had a new expansion vessel fitted bit the pressure is still rising to 2.9 bars . Is this normal ? Many thanks
    • Sangita
    • Thread
    • boiler central central heating expansion expansion vessel heating pressure vessel
    • Replies: 5
    • Forum: Boilers
  10. C

    What expansion vessel should i order for Boiler

    Hi, Currently have a Potterton Promax Combi 28 HE A boiler and looking to replace expansion vessel due to issues with it. Looking to make sure i get the right part for it Found this part online but it says it will Fit a Promax Combi 28 HE Plus A,Is the HE plus A and my boiler HE A the same...
    • CWilson
    • Thread
    • boiler expansion expansion vessel vessel
    • Replies: 1
    • Forum: Boilers
  11. M

    System boiler kw sizing and expansion vessel

    Hi, After a bit of a saga with my plumber, I need to chose boiler size as soon as possible, the plumber is not going to do any heat loss calculations or do anything to work out accurately so I am on my own. Appreciate this is not what should be doing but after some level of finger in the air...
    • meakinsl
    • Thread
    • boiler expansion expansion vessel system vessel
    • Replies: 16
    • Forum: Boilers
  12. J

    Expansion like vessel

    Currently installing air to water and underfloor.theres this expansion like vessel with two 3/4 iron male threads on top and bottom of it with no bladder on between.its goes before the primary flow hits the cylinder and underfloor manifold.anyone know of its function??we don't do alot of air to...
  13. D

    Unvented system and expansion tank pressurisation

    I've recently had a prv changed by a British Gas engineer under the homecare contract that I've taken out. The valve had failed and water was pouring out from the overflow pipe. The valve was replaced without too much issue. However, the red expansion tank above the boiler was NOT re-pressurised...
  14. J

    Hot water expansion

    Hi Just wondering in a vented hot water cylinder,when hot Does the water expand back up the cold feed into tank or via the vent pipe
  15. M

    Dhw expansion vessel combi boilers

    Most manufacturers ask for a small dhw expansion vessel on combi boiler installs if a water meter is fitted as this stops the expansion of the heated hot water from expanding in to the mains. But if there is a large distance between the boiler and the water meter is one not needed? Like when...
    • Matt0029
    • Thread
    • boilers combi expansion expansion vessel vessel
    • Replies: 3
    • Forum: Boilers
  16. C

    Dripping Expansion Tank - Please confirm diagnosis!

    Hi, I've got an oil fired Central Heating system and the overflow pipe drips intermittently. There's a blue expansion chamber just above the overflow that sounds 'full' (compared to the red one that sounds empty. In other systems I've had, when this blue expansion tank was full of water, it...
  17. M

    Expansion position heat only boiler

    I know when installing an expansion vessel it must be connected to the system without any isolation valves. How is best to pipe in to the system so it can't be isolated. In the diagram below a potential way I was going to pipe in to a heat only boiler. It could be isolated by isolating the...
    • Matt0029
    • Thread
    • boiler expansion heat
    • Replies: 39
    • Forum: Boilers
  18. M

    Expansion vessel pre charge

    I have a 35litre central heating expansion vessel that has come with a pre charge of 1.5 bar. Does this sound a little heigh? As the pressure in the system will have to rise above 1.5bar for it or absorb any expansion? Thanks
  19. H

    Tankless Water heater: Expansion tank burst

    Hi. It's cold as heck in Austin. Temps dropped to single digits last night in Austin. Last night loss power @ 2AM. This morning around 11:30am, heard a loud explosion coming from outside area where the tankless water heater system is installed. Noticed that the expansion tank exploded. You can...
  20. cr0ft

    Sealed System Additional Expansion Vessel Needed?

    Hi all, As a few of you will know, I'm a bit rusty on the tools now and was wondering how to tell whether an additional expansion vessel is needed. In short: - Have moved into a house with a sealed heating system, system keeps losing pressure but no obvious leaks. It's heated by a Greenstar...
    • cr0ft
    • Thread
    • expansion expansion vessel system vessel
    • Replies: 4
    • Forum: Plumbers Arms
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