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unvented

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  1. J

    Unvented cylinder recommendations??

    Hi all, I'm due to install my first unvented cylinder. (I've had my unvented ticket for several years, but not actually done a brand new unvented install yet). It's a house renovation, with a new hw and heating system. The house currently has an old gravity floor boiler, that will be coming...
  2. J

    unvented cylinder v combi store

    Hi all, My customer is renovating a house. Complete renovation of the plumbing. It's a three-bed house for a young family of 3. It will have one main bathroom (bath and maybe an over-bath shower), plus two shower ensuites. I have yet to check the incoming water pressures/flow rates to the...
  3. Fogster74

    Working on heating side of system with an unvented cylinder, no G3?

    Hi all, I'm a competent DIYer with an engineering background and am active in Heritage Buildings. I never touch anything I'm not allowed to albeit I've worked on the wet side of my own heating on the central heating circuit before when I had a combi - balancing rads, add a Fernox TF1, washing...
  4. C

    Humming from unvented cylinder

    Hopefully someone can point me in the right direction. Before I start I am G3 qualified. As per usual I was asked to rectify a leak on a combination valve. I installed a like for like 3.5 bar valve, all good, however I I checked pressure in exp vessel to find no pressure at all (Never been...
  5. A

    Noisy unvented cylinder advice Pls.

    HI everyone, I'm looking for some thought/opinions on what could be causing issues with noise and pressure since having a pressurised un-vented cylinder installed with an Air Source Heat Pump from a traditional gravity fed system. When it was first installed, whenever a hot tap was run there...
  6. R

    Unvented Hot Water System

    Hi, I’ve purchased a new build property and had a few issues with the unvented hot water system. I’ve now asked the developer, builder and plumber for proof of G3 certificate of the plumbers but have been told they have no need to show me this. I’ve searched the gas safe register and it’s not...
    • Rachael1278
    • Thread
    • hot water system unvented water
    • Replies: 66
    • Forum: UK Plumbers Forums
  7. U

    Unvented Cylinder Discharge pipe not to regs

    Hi, I'm looking for some advice on how to proceed with my current situation. We bought a new build and after getting my boiler and unvented cylinder serviced my plumber raised the fact that he estimates the D2 discharge pipe to have a resistance flow length on 12m and as it's 22mm copper pipe...
  8. B

    Unvented cylinder won't stop heating up when CH is turned on

    I have recently moved into a house with the following heating system: Traditional boiler (Worcester Greenstar Ri 24 with only one temperature dial and no pressure gauge) Vented central heating (cold tank in loft) Unvented hot water (Excelsior cylinder with pressure gauge plus white expansion...
  9. AndyCoo

    Central mixing valve near unvented cylinder

    Hi all I have a mixing valve question. Should I have one fitted close to my new unvented cylinder?
  10. gingalig

    Unvented and boiler heat loss calcs

    I have a house with 14kw heat loss using the whole house method, ( Navien oil system boiler ) I aimed to use heat engineer software on acceptance of the quote but have been struck down with covid, the unvented cylinder is 300ltr due too a family from Ukraine living there ( 8 people living...
  11. M

    Re newing G3 unvented

    Has anyone recently renewed there unvented? Is the theory a long exam?
  12. B

    installation of Boiler - Unvented tank

    As part of a rebuild (added 1st floor to bungalow and extended back) we have removed every piece of plumbing and electrics, during COVID In preparation for the complicated stuff, during the build we have ... Gledhill unvented tank (preplumbed) placed in 1st floor airing cupboard New...
  13. M

    Buffer Tank/Thermal Store addition to S Plan Plus & Unvented Cylinder?

    Hi sorry bit of an odd query here. With the increases in energy costs now and in the future we are trying to find any way to reduce our exposure (retired couple on fixed incomes). We are fortunate enough to have bought solar panels at the beginning of the year but as we head towards winter the...
  14. S

    Unvented Cylinder set up via gas system boiler and time clock

    Hi I wanted some steer from he forum for my set up. 2 storey house now extended on ground and a loft conversion. New plumbing install as of 18months. Worcester bosch 8000 life sysem boiler via natural gas. Time clock with HW / CH split, 7 day digital. 250litre Gledhill Select Indirect...
  15. M

    Renewing unvented quals

    Anyone know what is involved in renewing unvented qualifications. Is it a few written questions and a practical fault finding on unvented? I got my original through my level 3.
  16. N

    Unvented system leak issue

    I had my old boiler replaced and changed to an unvented system and relocated into the loft. Everything worked well for the first month or so. I then had a different plumber and builder to create new bathrooms and also put on new radiators throughout. The original plumber came back to...
    • Novice needs help
    • Thread
    • leak system unvented
    • Replies: 16
    • Forum: UK Plumbers Forums
  17. M

    Combi vs unvented???

    Hi guys. I know there’s a lot of people who are happy to just chuck in a combi on every install, whether it’s suitable or not. What I’d like to know is, in what situation do you refuse a combi? Obviously things like a 4 bathroom house might not be suitable but what about cost savings with...
  18. H

    Unvented cylinder for ASHP

    Hi all. I have an Isoflo CL170 cylinder with good few years life left in it in my system which has performed trouble-free other than the odd new immersion element. I'm getting a new ASHP fitted and the installer is recommending scrapping the Isoflo and replacing it with a Secon Trade Heatpump...
  19. B

    Boulter Camray 2 to run unvented/ pressurised

    Hello, Re-jigging a serviceable Boulter Camray 2 boiler to run presurised instead of gravity. Manual says it can but we need to fit Manual reset Limit stat and Phail tube to put into boiler for sensor -both available. (Also Expansion vessel obviously!) This seems straightfrward - any comments...
  20. R

    Pressure loss in new loft (unvented cylinder)

    Hello. I need some urgent advice re water pressure in an unvented system. A few months back, I had my gravity fed system + boiler changed to an unvented cylinder + system boiler. The water pressure following the swap was incredible. We were originally talking about putting in a mains booster...

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