Page 1 of 2 12 LastLast
Results 1 to 12 of 13
Plumbing & Plumbers Forum - Expansion tanks - background info
Like Tree1Likes

Expansion tanks - background info

Discuss Expansion tanks - background info at UK Plumbers Forums; Hi all - Apologies for intruding, but I was curious if you wouldn't mind helping me better understand the use and preferences related to expansion tanks/vessels in your area. I'm ...
  1. #1
    Member
    Join Date
    Jan 2017
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Expansion tanks - background info

    Hi all - Apologies for intruding, but I was curious if you wouldn't mind helping me better understand the use and preferences related to expansion tanks/vessels in your area. I'm tasked with learning how they compare to use in the United States.

    - Are expansion tanks common in your area? Will there certainly be one if household has a boiler/water heater?
    - Are they mandated by any regulations?
    - What brands are the best in your opinion? Or does brand not matter?

    Many thanks!

  2. #2
    UK Plumbersforums Trusted Advisor.
    SimonG's Avatar
    Join Date
    Feb 2011
    Location
    in the land of make believe, in the county of durham, next best to Yorkshireland
    Posts
    16,035
    Thanks
    552
    Thanked 1,556 Times in 1,495 Posts

    Default Re: Expansion tanks - background info

    Have a read up on vented heating systems and sealed heating systems.
    Fly Me To The Moon And Let Me Play Among Stars.............




    No I'm not cheap, but I'm happy in my work.

    Wouldn't you rather have somebody that's happy working in your house?


  3. #3
    Member
    Join Date
    Jan 2017
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Re: Expansion tanks - background info

    Sorry, I wasn't very clear. I'm well-versed on the benefits and function of expansion tanks but only in the United States. What I'm trying to understand is how large the market is in the UK (whereas in the US it's inconsistent based on municipal regulation and homeowner preference) and what brands you have over there. Appreciate any help.

  4. #4
    UK Plumbersforums Trusted Advisor.
    SimonG's Avatar
    Join Date
    Feb 2011
    Location
    in the land of make believe, in the county of durham, next best to Yorkshireland
    Posts
    16,035
    Thanks
    552
    Thanked 1,556 Times in 1,495 Posts

    Default Re: Expansion tanks - background info

    Zilmet is popular.

    Basically whatever is on the shelf.

    It's an age thing over here. Older systems tend to be open vented and newer ones sealed. But even that statement can vary.
    Fly Me To The Moon And Let Me Play Among Stars.............




    No I'm not cheap, but I'm happy in my work.

    Wouldn't you rather have somebody that's happy working in your house?


  5. #5
    rpm
    rpm is online now
    Member rpm's Avatar
    Join Date
    Jan 2013
    Location
    Wherever I lay my hat
    Posts
    7,827
    Thanks
    349
    Thanked 478 Times in 463 Posts

    Default Re: Expansion tanks - background info

    Taylor, what would you say is the average size tank in an average house your side of the pond and welcome to the forum.

  6. #6
    Plumbers Arms member
    Join Date
    Jun 2012
    Location
    London/Kent
    Posts
    3,950
    Thanks
    197
    Thanked 491 Times in 469 Posts

    Default Re: Expansion tanks - background info

    We tend to call them expansion vessels when used in heating & domestic hot water systems.

    There is no regulations as such, almost all new systems will be sealed & require one but the majority will come pre-installed as part of the boiler.
    Combination (combi) boilers which provide heating as well as domestic hot water & system boilers which just provide heating but come complete with the vessel.

    Some old open vented systems are converted & have a vessel & safety valve installed but it is not many.

    Vessels are also installed to some un-vented hot water cylinders (mains feed) we don't tend to have gas or oil fired direct tanks like you do, ours are either electric or indirectly heated from the boiler.

    Until recently we had vessel suitable for heating systems coloured red, while those suitable for domestic (hot & cold water) use were coloured white, grey or stainless steel.
    With the new rubber that is suitable for both uses I have seen them in red as well.

    As far as I am aware all our vessel are imported mainly from Europe.

    Hope that helps
    Nolite id cogere, cape malleum majorem

  7. #7
    Member
    Last Plumber's Avatar
    Join Date
    Aug 2016
    Location
    Lancashire
    Posts
    1,121
    Thanks
    0
    Thanked 114 Times in 113 Posts

    Default Re: Expansion tanks - background info

    As above, there are a lot of variations. In my neck of the woods I would say there are more sealed systems going in to replace open vented.

    Make/brands, there are many but no real preferences personally. All pretty much the same.
    Domestic properties over here, you'd Normally find a 10 Gallon F + E tank for heating systems and tanks for Cold water storage will vary.

    Does that help?

  8. #8
    Member
    Join Date
    Jan 2017
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Re: Expansion tanks - background info

    That's all really helpful, thanks for sharing so willingly.
    RPM had asked a question about the common size of expansion tanks over here. Water heaters run ~40-50 gallons and an expansion tank is 2.1 gallons (~$30-40 at retail).

  9. #9
    Member
    Join Date
    Jan 2017
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Re: Expansion tanks - background info

    That's all really helpful, thanks for sharing so willingly.
    RPM had asked a question about the common size of expansion tanks over here. Water heaters run ~40-50 gallons and an expansion tank is 2.1 gallons (~$30-40 at retail).

  10. #10
    Member
    Join Date
    Jan 2017
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Re: Expansion tanks - background info

    If anyone is still following, I'm curious to try and better pin down how often expansion tanks are used. For every water heater or boiler, will there always be an expansion tank? 50% of the time? 10% of the time?

  11. #11
    UK Plumbersforums Trusted Advisor.
    SimonG's Avatar
    Join Date
    Feb 2011
    Location
    in the land of make believe, in the county of durham, next best to Yorkshireland
    Posts
    16,035
    Thanks
    552
    Thanked 1,556 Times in 1,495 Posts

    Default Re: Expansion tanks - background info

    No. Stopped following.
    steveb likes this.
    Fly Me To The Moon And Let Me Play Among Stars.............




    No I'm not cheap, but I'm happy in my work.

    Wouldn't you rather have somebody that's happy working in your house?


  12. #12
    Plumbers Arms member
    Join Date
    Jun 2012
    Location
    London/Kent
    Posts
    3,950
    Thanks
    197
    Thanked 491 Times in 469 Posts

    Default Re: Expansion tanks - background info

    I would say that at least 95% of all heating vessels installed in this country form part of a boiler (combination or system) replacement of these are normally purchased from the boiler manufacturers.

    Not sure what % of hot water cylinders sold are un-vented & require a vessel, however those that are, are always supplied with a vessel by the cylinder manufacturer as a match pair.

    The market leading brand of unvented cylinder which I would guess amounts for 45% of sales are a bubble top & therefore do not require an expansion vessel.

    http://www.screwfix.com/p/expansion-...FYwQ0wodxiwIug
    Nolite id cogere, cape malleum majorem

Everybody loves a good deal: Deals and Discounts on Dozens of Powertools!
Everybody loves a good deal: Deals and Discounts on Dozens of Powertools!

Similar Threads

  1. Water in oil tanks
    By EPH in forum Oil and Solid Fuel Forum
    Replies: 16
    Last Post: 22-11-2013, 10:57 PM
  2. Background heat on fluless fire
    By villa_tom in forum Central Heating Forum
    Replies: 1
    Last Post: 06-12-2010, 08:13 PM
  3. 3 Tanks in the loft
    By leejones in forum Central Heating Forum
    Replies: 4
    Last Post: 24-11-2010, 09:28 PM
  4. Expansion Tanks in sealed system
    By jddevel in forum Central Heating Forum
    Replies: 11
    Last Post: 20-10-2009, 11:05 PM
  5. Low pressure from tanks
    By John Gallon in forum Plumbing Forum
    Replies: 9
    Last Post: 13-05-2009, 10:49 PM

Visitors found this page by searching for:

Nobody landed on this page from a search engine, yet!

Tags for this Thread


Try our Talk Electrician Forum and our popular Tilers Forums for more free advice from professional tradesmen.
Tens of thousands of tradesmen and over 2 million combined posts.


Plumbers Forums is a community-driven forum shared between all members.