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expansion

  1. K

    Intermittent Overflow of Feed and Expansion Tank

    Hello my parents have a house with an open vented system. It has an oil boiler feeding 4 circuits of radiators and also an indirect hot water cylinder. It also has a solid fuel fireplace back boiler (with 4 pipes) to it. The fire can heat both the radiator and the hot water. The fire is never...
  2. 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...
  3. C

    Water overflow from CH expansion/fill tank

    I have intermittent problems with hot water flowing into my central heating expansion/fill tank from the vent pipe sometimes when the system starts first thing in the morning causing the tank overflow to run. It does not happen every time and it only seems to happen first thing and not when the...
  4. M

    Expansion position on zoned heating

    Just wondering if anyone had any thoughts/ objections to position of expansion vessel. 3 zones on heating upstairs, downstairs and UFH. All zone valves on flow, pump on flow, loss header as well. Expansion vessel it situated on the return from the upstairs zone. I suppose it can’t be cut off by...
  5. 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...
  6. 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...
  7. F

    Expansion Tank sounds like a foghorn

    We recently dropped the house water pressure from 70 to 60 psi and increased the pressure in the expansion tank from 40 to 60 psi as I was told that they should be the same. The hot water tank and the expansion tank are 3 months old and there were no issues when the house pressure was at 70 psi...
  8. P

    Thermal expansion issues

    Hello all! I'm located in the US. I had a water pressure issue (150PSI) until I replaced the water pressure regulator (replaced the faulty one with a WATTS LF25AUB-RK,) which came preset to 50PSI. It held that pressure for about a week. Slowly but surely, the water pressure's been creeping up...
  9. L

    Expansion tank pipes

    Hello, I'm an electrcian who is just trying to grasp some knowledge of heating systems as I've got some S plan jobs coming up. On older installations what is the pipe used for that runs from the header tank into the flow pipe? Expanding water?? How come this set up is not required on combi...
  10. 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...
  11. M

    Screwfix Expansion Tank

    Anyone know weather you leave in the plastic insert in the expansion tank threaded connector?
  12. M

    Expansion vessel insert, should I remove?

    Has anyone installed a Refix potable expansion tank? There's a plastic insert inside the 3/4 threaded connector - should it be left in? I though it maybe to space the diaphragm off the inlet point, but not sure if it's just a protector insert which will stop the tank operating - nothing in...
  13. J

    greenstar 24i expansion vessel hose

    I have removed an old expansion vessel from a Worcester greensatr 24 i. I am now trying to reconnect the hose but I am having great difficulty. Its so tight inside the fitting. Is there an easy way to reconnect it? Thanks
  14. M

    HW expansion vessel pressure and sizing

    Afternoon, I am not a G3 engineer but am using the downtime during COVID to do some extra learning. Is there a calculation to use to correctly size the expansion vessel and have the correct pressure in the vessel on unvented HW systems? Thanks
  15. M

    What pressure to charge HW expansion vessel?

    Afternoon, this is purely a query and learning benefit. I am not a G3 qualified engineer, however am just using the down time during COVID to take on some extra learning. Would anyone know if there is calculation or something to determine what pressure and size the vessel should be on an...
  16. M

    Zilmet expansion tank block?

    Brand new 18l Zilmet expansion vessel (red) and the neck seems to be blocked by thick black rubber. Is that the bladder, tank is pressurised but can’t be pushed in with a finger. I just want to check as by the time an engineer comes it’s going to be too late to replace? Matt
  17. M

    To fill expansion vessel with water?

    Hello! I’m wondering which will cost more - to run our heating system with an inefficient/broken expansion vessel for a minimum of six months from now, or to call out an engineer (£100 excess). Our house is a new build and still under warranty. I noticed the pressure in our unvented system...
  18. J

    Why would cold mains feeding the boiler need an expansion vessel?

    British gas fixed a leak in the boiler and said the due to the recently installed water meter the fluxuation in pressure caused the leak. They advised to get a expansion vessel on the the cold mains entering the boiler. I read on here someone say that Worcester wouldn't warranty boilers being...
    • Joef
    • Thread
    • boiler cold expansion expansion vessel mains vessel
    • Replies: 5
    • Forum: Boiler Advice Forum
  19. Lumen

    Lowering Expansion Vessels on Unvented System

    Hi Chaps, Wife has been nagging me about having shelves in an airing cupboard for about a year now. We've had unvented cylinder fitted last year and both expansion vessels are very high to fit a towel shelve (as it will be just below the top of door frame). Can the expansion vessels be lowered...
  20. N

    Wilo pump & expansion tank - need to repressurise

    I live in Azerbaijan where I have a Wilo MC605-EM pump attached to a Wilo LRS 50/10H diaphragm expansion vessel, which pumps water into my house on demand. We have a large water storage tank sitting between the mains and the pump so there is effectively no water pressure, the pump sucks water...

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