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expansion vessel

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  1. R

    Hot Water Tank Expansion Vessel Question

    Am I correct in saying that the capacity of an expansion vessel as written on the appliance data label is the capacity of the water compartment alone and excludes the air compartment capacity? Thanks
    • RayPooley
    • Thread
    • expansion expansion vessel hot water tank vessel water water tank
    • Replies: 18
    • Forum: UK Plumbers Forums
  2. C

    Expansion vessel for potable water for a combi boiler

    Hi,a customer of mine has a combi boiler and they don't have an expansion vessel for the potable hot water supply. I know there's an expansion vessel for the closed-loop central heating circuit but I doubt the combi boiler has one for the potable water. I was thinking to put one in the airing...
    • CLC plumbing
    • Thread
    • boiler combi combi boiler expansion expansion vessel vessel water
    • Replies: 18
    • Forum: Boilers
  3. M

    Pressure gauge showing zero on red expansion vessel

    New to this so please bear with me! The pressure gauge at the bottom of my red expansion tank is showing zero. However my radiators are getting hot and boiler seems to be operating okay. I did bleed a bathroom towel rail yesterday which only had heat at the very bottom. Not a massive amount...
    • Macca4
    • Thread
    • expansion expansion vessel pressure vessel
    • Replies: 2
    • Forum: UK Plumbers Forums
  4. N

    Ferolli expansion vessel

    I need a new expansion vessel, problem is I've got a optima 901 and the flue goes up about a foot and then into the back wall and the vessel is at the back, it's one of the round ones, I've got to get a engineer into do it, I'm assuming that they take the flue out and lift it from the back...
  5. C

    Expansion Vessel Pressure

    Hi, Should an expansion vessel pressure match the pressurisation unit? For example, if the pressurisation unit is set at 1.2 bar should the expansion vessel be set at 1.2? Many thanks
  6. 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...
  7. 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...
  8. 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...
  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. 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
  13. 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
  14. 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
  15. E

    How to recharge an expansion vessel?

    Hi, When my boiler (regular vented I believe) is on there's a constant trickle of water flowing out a pipe to outside (coming off the red vessel in the image below). It's happened in the past and IIRC the expansion vessel needs recharging. I'm pretty sure it's the case again as when I take the...
  16. S

    Correct Expansion Vessel Pressure

    Evening all, So I've been losing pressure from my boiler on a daily basis and having to top it up. The pressure gauge is up at around 3.5 bar when the boiler is on so I assumed the expansion vessel has either failed or is low on pressure. I had a look on both the Cimms website (the EV is a Cimm...
  17. danieljamesphoto

    Changing kitchen taps with an expansion vessel

    Hi, i'm a complete newcomer to plumbing so be gentle, basically i'd like to change the kitchen taps (just a simple monobloc mixer tap) and have looked on YouTube and think I have everything ready. I've had a look at the system and it seems to be setup to include an expansion vessel (image...
  18. P

    Combi KW Rating (High or low?) - Fit De-aerator and Extra Expansion Vessel?

    Hi All, I am looking to replace an Ideal Classic FF350 in a 4 bed detached house, 1 main bathroom with a bath and electric shower, also en-suite with a thermostatic shower that is currently pumped (knackered) from a DHW cylinder (essex flange weeping). F&E and CWS tanks in the loft, gravity fed...
  19. Scott_D

    Shock arrestor / mini expansion vessel

    Do you fit them when fitting a combi? What type? Mechanical shock arrestor or mini expansion vessel with shreader valve? Do you service them annually?
  20. N

    Groaning Expansion Vessel

    The tundish near the expansion vessel started dripping, plumber came and pumped up expansion vessel and dripping stopped, great. However now, every time we flush any of the loos we get a strange heavy vibration noise through the expansion vessel for 1-2 seconds. We also recently discovered it’s...
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