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unvented

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  1. R

    High gain unvented cylinder

    Hi there I am looking at changing my vented cylinder to an unvented 210L. I currently have a 30kw system boiler which I would like to continue using with the new cylinder. Looking at the various manufacturers of unvented cylinders, I see some of them have ‘high gain’ versions, such as Joule...
    • rk1655
    • Thread
    • cylinder high unvented unvented cylinder
    • Replies: 4
    • Forum: UK Plumbers Forums
  2. N

    Unvented cylinder pressure issues

    Hi, I am having issues with an unvented water cylinder and just wanted to double check something. About a week ago I noticed that when the system was turned on there was a dripping coming from the prv and pressure rose to around 4.5 bar. As soon as a toilet was flushed or tap was run the...
  3. J

    Installed Unvented cylinder will cause water pressure high?

    Dear all, I recently got a gas engineer installed a new boiler and an unvented cylinder & expansion vessel in my house, replaced the old boiler, vented cylinder and water tanks in loft. Just after a month of installation, last week, the house lost hot water, it was because the cylinder...
  4. M

    Unvented cylinder problems - over pressure or faulty expansion tank?

    Hi, New to this forum and also complete novice who knows pretty much nothing about plumbing. However I have done quite some google searching trying to find some answers. I live in a 1st floor flat which uses an electric duel element direct unvented water heater cylinder (150 litres). Recently I...
  5. N

    Unvented indirect with low pressure mains

    Hi, I live in a 9yr old 3 story townhouse with showers on the 1st and 2nd floor, a bath on the 1st and toilets and basins on all three floors. I've never been very happy with my shower and tap water pressures but have only recently investigated the issue. The house has an unvented indirect...
  6. D

    How long should I be heating my unvented cylinder

    Hi All, I have a tempest 360litre cylinder with a Ecotec 637 (37kw) all tucked away in the loft. I currently heat it for an 1.30 at 7 a.m. in the morning and then for 3 hours at 6pm till 9pm I actually wasn't sure this is the best way to heat it as I've read you should leave it for 6 hours...
  7. B

    Anyone used Ferroli 50l unvented, any good?

    I’m talking about the wall mounted water in/out at the bottom, small unvented cylinders. I have used Hyco 50l powerflow unvented, they come with all the controls for just under 400. Anyone have experience of Ferroli SEV 50 l unvented as they seem quite a lot cheaper, 240.
  8. D

    Megaflo Unvented Air Gap Recharge Water Doesn't Stop

    I have a megaflo unvented cylinder on the first floor of my property and I am trying to recharge the air gap. I have turned off the incoming cold mains valve upstream (and right next to) the pressure regulating valve and then opened the hot water taps at the lowest point in the house. The...
  9. S

    Direct unvented cylinder

    Hi having trouble finding a local plumber to fit a direct unvented cylinder. Advertised on 3 board's but with no response. I have posted a budget of £1000 is this too low? This is for hot water only not heating. Kevin
  10. S

    Joule Unvented 300lt Cyclone, 2 Heatrod Immersions with Cotherm TSE T115s, and a Codice 542791

    Heno here. From Ireland. I'm a marine sparks but that doesn't qualify in any way to deal with electric and water. Pleasure to meet you all. I know the title of my 1st post might be moderated but I couldn't shorten it. I've a Joule 300lt Cyclone tank. It has 2 Heatrod immersions with a Cotherm...
  11. B

    unvented hot water cylinder in a roof space of a two storey house

    unvented hot water cylinder in a roof space of a two storey house in an existing property what is best option for discharge pipe to terminate.It will be 22mm copper but didn't want to run it all the way down the back of the house to ground level if possible.
  12. H

    Changing bath mixer tap on Unvented System?

    Good Evening all, hope everyone is well. Im not long out of my time so go gentle please lol. I have the job of replacing bath mixer tap (no isolation valves fitted under bath). It has an unvented cylinder installed. Is it just a case of isolating mains water, opening taps to drain water out of...
  13. J

    Retro-fitting balanced cold on an unvented - query

    Hi all, fairly new to G3 work as recently certified (!). Done a couple of installs from scratch, all good. Job here is to retro-fit a balanced cold circuit from a Gledhill unvented to a recently refurbed bathroom that now has all mixers (apart obviously the toilet). Cylinder has Reliance...
  14. M

    Yellow water from new unvented cylinder

    Has anyone experienced this before. Converted gravity hot water to new unvented cylinder (150l indirect evocyl) filled the cylinder up and had yellow water for about half an hour before it started to clear. Any ideas from anyone. I’m G3 registered. Was converted due to suspected split coil in...
  15. J

    Problems running multiple outlets with unvented system in new build

    Got a brand new 25mm hdpe incoming main with pressure of 2/2.5 bar. Need to check flow rate but doesn’t look great at kitchen sink. The main connects to stopcock and is run in 28mm directly to cylinder which is located on 2nd floor of a town house. Hot and colds are run out in 22mm. It serves a...
  16. D

    Unvented system and expansion tank pressurisation

    I've recently had a prv changed by a British Gas engineer under the homecare contract that I've taken out. The valve had failed and water was pouring out from the overflow pipe. The valve was replaced without too much issue. However, the red expansion tank above the boiler was NOT re-pressurised...
  17. I

    Unvented cylinder installation

    Hi All, We want to replace vented with unvented cylinder but cannot find any decent plumber in North West London to carry out the works. Every plumber I have called doesn't even bother to check water pressure or even flow rates. Not even British gas. Not sure what to do now. Currently have...
  18. J

    Unvented cylinder waste

    Hi, 1st fixing a house. Im looking at the blow valve for an unvented cylinder There's no external wall near the hotpress so I'm gonna run a waste pipe under the floor. It'll have a tundish so they can see if it's discharging. What I'm wondering is if I can then tee that waste in with the pipe...
  19. Macaque321

    Unvented cylinder in cellar with drain hatch

    I've just bought a Victorian house that needs renovation. Currently there is a boiler and hot water tank in the cellar, and tanks in the loft. I'd like to have an unvented cylinder installed in the cellar, but the plumber I got in said that it needs to have access to an open drain. There is a...
  20. R

    Ariston STI 150, unvented indirect cylinder.

    My house (old) has a heating system installed with a Protech Anti corrosion system, I don't know how old the cylinder is, which is showing signs of rust from around the Protech box! I can see the outside skin of the cylinder is thin mild steel, but thought the core was stainless steel? Is such...
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