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unvented cylinder

  1. J

    Changing unvented cylinder immersion element

    Hi all, I"ve got my G3 unvented. Customer wants an immersion element changing. Access is limited - once I get into the cupboard, and I do my electrical tests it hopefully might just be the stat that needs swapping. However, if it is the element... words of advice and tips would be...
  2. M

    System boiler fit to unvented cylinder

    My friends dad had a system boiler installed in replacment of an old floor standing boiler. The unvented cylinder is right next to the boiler. The firm has fitted the system boiler. But ignored the fact the pressure relief is dripping on the cylinder. As the expansion vessel has lost its charge...
  3. S

    Does anyone know this brand of Unvented Cylinder?

    Two different brands of Unvented Cylinder have been recommended to me. I have never heard of either of them, nor can I find reviews of them. Does anyone know them? Thanks for your advice. They both appear to have innovative internal expansion vessels, like the Mega-Flo's. Evocyl Air Standard...
  4. S

    What make of Direct Unvented Cylinder, and what size?

    Hi, some professional advice would be greatly appreciated, We are having an Unvented Cylinder installed into our 2 bedroom ground floor flat. I have had a few quotes and been given lots of differing advice, this always makes me wary, especially having suffered a history of poor quality work by...
  5. P

    Pricing to replace a vented cylinder with an unvented cylinder (megaflo)

    Hello , ive recently gone out on my own, i have been working in the industry 15years now /g3 qualified and i would just like to get some advice from the knowledgable people on this forum! i have done a lot of installing but haven't really got involved with the design as somebody else has done...
  6. Stants

    Unvented Cylinder size ? ( Evocyl )

    Hi all I'm having New heating set up installed in a loft conversion the Cylinder ( unvented ) and Boiler are being sited in a cupboard within the loft space ( adjacent to the new stairs ) im a bit tight on space Height and width as I am trying not encroach on the bedroom as much as is possible...
  7. Q

    Unvented cylinder install - safety concerns. Appreciate advise.

    Evening all, At risk of blabbing on i'll try keep this short. I recently replaced an old vented hot water system with a unvented system We went for the Telford Tempest 300L installed by G3 qualified person. Functionally it works well. Pressure is great, heats well, no leaks. There's still...
  8. H

    Unvented cylinder in celler

    If I install an unvented cylinder in a cellar and a system boiler on the ground floor above will the system still work?
  9. S

    Unvented Cylinder loses pressure when I bleed radiator

    my unvented cylinder system has been losing pressure. So I started the investigation as to whether it is losing pressure due to hot water or heating. So waiting for spring / summer when I don’t run heating much. I can see that only one of the radiators which I need to bleed as it is always cold...
  10. Lumen

    Unvented Cylinder. Does this guy know what’s he’s doing?

    Hey guys, Quick question for all you central heating experts out there. I’ve had a guy lowering two expansion vessels and installing additional zone valve for a new extension. As the result he’s re-done most of the plumbing in the airing cupboard. Nice guy, but he was rushing to get the job...
  11. C

    Leaking/Whining Unvented Cylinder

    Howdy, We had our loft tank removed and our cylinder replaced with a Worcester Greenstore unvented cylinder and have a few issues with it. Firstly, it is leaking pressure. We were advised it should stay around 1.2 bar when cold but have had to refill it semi-regularly. We cant find a leak on...
  12. M

    Temperature relief unvented cylinder

    What can be causing a temperature relief to drip. I have recharged the expansion vessle that had totally lost its charge. I am g3 registered. Thanks
  13. R

    unvented cylinder thermostat

    does any one know the difference between an ordinary immersion thermostat and one for an unvented cylinder, they look identical (both have overheat cut outs) but paperwork says not suitable for unvented cylinder, cannot get through to manafacture for advice, even one i got from online supplier...
  14. gmartine

    Unvented cylinder in loft - terminating tundish

    What would folks usually opt for easiest route to soil stack?
  15. M

    Unvented cylinder in loft with open vented heatinf

    I have a job putting an unvented cylinder in loft, (I’m G3) but they have open vented heating. I’m wondering if this will be possible as flow into cylinder will be higher than f and e tank. Worries about pumping over, any thoughts? Convert heating to close system first?
  16. M

    Combined feed and vent with unvented cylinder

    Got a job today to take out vented cylinder and replace with unvented indirect cylinder (i’m G3 qualified). Only problem is the system has a strange set up. It’s combined feed and vent S plan system. Heating zone valve is on the flow and pump and hot water zone valve on return. My issue is that...
  17. A

    Servicing Megaflo Unvented Cylinder - G3 Qualified

    Hi, I have recently had my Megaflo Unvented Cylinder serviced but didn’t check if the plumbing and heating engineer was G3 qualified before they carried out the work. I understand that it is a legal requirement to be G3 qualified to install an unvented system but is this also true to be able...
  18. M

    Albion Mercury Gold Unvented Cylinder

    Hi, I need some advice on an Albion Mercury Gold Unvented Cylinder. I have been told that the internal air expansion has failed and that the cylinder cannot be repaired, only replaced. Is this true? Also, there has been an external expansion valve fitted at some point. Is this correct...
  19. G

    Heat proof "waterless" valve for Unvented cylinder T&P connection to soil stack

    I have just had an unvented cylinder fitted, and the T&P valve is connected as per regs via a tundish, and then into the soil stack using a copper pipe. But I've had to ask the plumber to come back, because it looks like he hasn't done anything to prevent sewer gases from coming into the...
    • GeoffG
    • Thread
    • connection cylinder heat soil unvented unvented cylinder valve
    • Replies: 21
    • Forum: Boiler Advice Forum
  20. A

    How to Replenish Air Gap In Unvented Cylinder?

    I have noticed water dropping intro the tundish of my Megaflo Unvented cylinder. I believe I need to replenish the air gap. Do I need to switch both the levers/valves off in the pictures attached before starting the process? Thanks in advance.

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