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expansion

  1. T

    Expansion Vessel for a Boiler

    Hi Guys, My expansion vessel has burst.. What is an average size I should be looking for in an expansion vessel for my heat only boiler, and are there any good brands I should go for? Thanks!
  2. J

    COMBI 2 ZONE + UF + EXPANSION VESSEL ADVICE

    Hello i'm new to the forum, I've done a little searching on here and still have questions. Some history... I had 11 double rads in my house then i extended the house and added underfloor heating and 4 more double rads, the extension was all plumbed in and has been running for a year now. My...
  3. Bogart

    Vent pipe on expansion tank.

    Have inherited a half cocked system which am now trying to sort. Attached is a photo of the setup. well part of it. Am just being certain what the 2 pipes on the top of the air seperator are.Think I am correct in saying the 22mm pipe is the vent and the 15mm pipe is the feed/expansion one. Is it...
  4. V

    Has hot water from expansion pipe damaged cold water storage tank?

    Hi, Trying to get my head around what may have caused our, admittedly very old, plastic cold water storage tank to split and leak through the bathroom ceiling. We have what I believe is referred to as an open vented system - conventional boiler, cold water storage tank and small header tank in...
  5. Bogart

    Expansion tank is it big enough.

    Doing a bit of a revamp of heating system some rads out new ones in . Took old galvanised expansion tank out of loft. Now I reckon this thing had a capacity of a good 100 litres. Looking at replacements they seem to be 18 litre and that is it. Now I have some 22 rads and what with a run to and...
  6. J

    Expansion Relief Valve

    Hi, I am relatively new to installing and repairing unvented cylinders, having worked largely on vented systems up until now. Today I have come across a megaflow that has a TPRV but no Expansion Relief valve on the inlet. Is there ever a situation where the ERV isn't required or does not have...
  7. J

    expansion tank overflowing - a big puzzle why

    Hi all, My customer's f&e tank overflow has had a steady trickle. When the hot water is turned on, it gushes. I initially changed the ball valve (shutting off perfectly) and stiffened the side of the tank (it was flexing out, but otherwise been in for years with no issues), then realised the...
  8. C

    Expansion Vessel losing all pressure in hours?

    Hi All, Bit clueless here, but wanted some advice if possible. We had a new 200ltr unvented system installed recently. All seemed fine, however the CH kept turning off and rads going cold. I checked the EV in the loft, and it's pressure gauge had dropped to 0. I opened the valves up and...
  9. Eyespy999

    Expansion vessel pump

    Afternoon, I am looking to add to my tools, can anyone reccomed a pump for expansion vessels please? Regards
  10. S

    Expansion Vessel Requires Replacement In Lancs

    Hi, I have solar panels for the hot water system & an expansion tank has developed a leak. I'm based in the Clitheroe area of Lands and would like a quote from someone who covers this area. Thanks.
  11. H

    expansion vessel pumo

    after some advice need a new pump for re pressurising expansion vessel which one would you recommend also do you use a pressure gauge or pump to test vessel
  12. R

    6 bar expansion relief outlet keeps dripping into outlet

    Hi All I replaced this a year ago and now its dripping again. Image of part here: Photo 15-08-2014 11 26 00.jpg This video will explain the issue better (click on video to hear me). https://goo.gl/photos/zUrBQs2LjagBW1yt9 Thank you for any advice. R
  13. H

    Expansion Vessel and water hammer

    Good morning, I've just been asked that if someone has a tap which shuts of the water abruptly, such as the cartridge valve taps and water hammer occurs, would fitting a small expansion vessel close to the tap relieve this? To be honest I have no idea but I can find the logic to this question...
  14. F

    Expansion Vessel size ?

    I have an underfloor heating system of 720M of 16mm Alpe pipe & only short 2M runs of 28mm pipe to a Ground source heat pump. Absolute maximum temp rise of 65 degrees more probable 40 degrees. What size should the expansion vessel be ?
  15. S

    Unvented Expansion Vessel Keeps Failing

    I have a RM Stelflow 210 indirect unvented cylinder. Over the years it's been in, the expansion vessel has failed on 3 occasions. Any ideas what could be causing this? cheers, Stephen
    • stephenr
    • Thread
    • expansion expansion vessel unvented vessel
    • Replies: 3
    • Forum: Central Heating Forum
  16. finchy01

    Loads noise from expansion vessel

    I recently replaced a PRV on a cylinder that was letting by. I drained from the T&P valve and a little extra from the doc on the cold feed right before cylinder. I also repressurised the external exp vessel to just shy of 3bar as it was totally flat. I got a call yesterday saying that every ime...
  17. M

    Hot water being returned to feed and expansion tank via return pipe

    Good afternoon to you all. Firstly please allow me to apologise if this question has been asked time and time again but i'm baffled, have googled like hell and am now maybe a little confused. So, Saturday evening i pop out and upon return i notice water dripping from one of the attic overflows...
    • markp2067
    • Thread
    • expansion hot water pipe return tank water
    • Replies: 20
    • Forum: Central Heating Forum
  18. C

    Potable expansion vessel hose

    Hi guys , I've heard that you can't use potable expansion vessel hoses now when installing new unvented cylinder. As it is not wras approved. It must be piped up rigid .is this true ? What do you guys do ??
  19. lolipop

    Baxi duo tec expansion vessel

    Can someone enlighten me where the water comes from which lies in the combustion chamber when the expansion vessel has lost its charge ,been to 2 of these boilers recently recharged vessels but cannot spot where this water is from , I've checked the condense hose but seems fine any ideas ?
  20. SlimD

    Open-vented system with no expansion pipe

    Can anyone tell me if there is any situation where, on an open vented system, you wouldn't have an expansion pipe on either the cold water cistern or the F&E tank? I came across it today. Looked like a decent install otherwise but it struck me as odd. The owner said he'd been told by the...

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