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unvented cylinder

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  1. 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...
  2. king of pipes

    Valliant ecotec 37kw + Oso 210 unvented cylinder

    Nice little project all first fixed huge open plan living area kitchen , utility room , double bedroom , and cloakroom, all heated by underfloor heating. This is my first Oso and specifically went for it as all the connections are on the top of the cylinder and the space I had to work with was...
  3. 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: Boilers
  4. 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.
  5. C

    Descaling unvented cylinder

    Hia guys I have a 300l unvented hot water cylinder not getting up to temperature. Primary Flow into the coilis coming in at approx 70deg but water temperature is not getting above 40deg. Cylinder is over 10years no scale reduction so Im guessing the coil is scaled or sediment build up is...
  6. T

    Heatrae Sadia unvented cylinder & Tundish

    Hi All I have a Heatrae Sadia unvented cylinder... with the usual PVR on the side... which discharges to a tundish which is then connected to a 'fanny trap'. The problem - Water trickles through the tundish after about an hour or so of the hot water being heated and the pressure rises. It's...
  7. T

    Unvented cylinder size

    Hiya guys I currently specing a job for a 5 bedroom house with x5 ensuites. Could anyone advise me on sizing cals for unvented cylinders. Thank you
  8. L

    Unvented Cylinder Query

    I’ve recently moved into a property which currently has a combi boiler, two bathrooms, one power shower and one electric shower. I’m wanting to change this out for an unvented system with two showers operating from the cylinder. Both showers would run at 20 LPM. My current water supply is 15MM...
  9. C

    Tempest Unvented Cylinder - Immersion Heater?

    Evening all, We have had a Tempest 250l unvented cylinder for just under a year which runs in connection with a boiler. It is scheduled to come one once a day (6am) for 1hr and it provides the house with hot water for the rest of the day. I have read on some forums it may be cheaper to run via...
  10. C

    Unvented Cylinder Tee Off

    Just a quickie, should i tee off for an exp vessel before a balanced tee off or after? Or does it not really matter?
  11. S

    Unvented Cylinder Kingspan Albion Ultrasteel

    Hi can anyone help? I called an Engineer as there was water discharging through the tundish of my heating system, he diagnosed ‘cold water compilation valve failed’ then said I had to call a plumber as it was nothing to do with the system and was a plumbing issue. Surely this is all to do with...
  12. Rakesh

    Gledhill light unvented cylinder imploded

    Hi everyone, Hope someone can shed light on this problem. I’ve been and changed bath taps For a client by first isolating the cold mains. I then opened the kitchen mixer tap to drain both hot and cold water and while that was draining, I went into the bathroom and opened the separate hot and...
  13. A

    Megaflo unvented cylinder drip

    Hi there. I have noticed a drip on the primary flow pipe going into the tank. Not sure what could be causing it. It seems to happen when the heating and hot water are off. Have attached a photo. It comes from the top and runs down the pipe. No dripping in the tundish and we replenished the air...
  14. R

    Advice please on an unvented cylinder

    Firstly hello, i did a quick search and wasn't sure whether this should be in here or the central heating section so if i've got it wrong i apologies! We are looking to replace our current vented system with an unvented indirect 210l cylinder to replace the current pump used for two deluge...
  15. B

    Unvented cylinder relief valve letting by

    Posting here as the unvented G3 forum does not let me post. I am hoping someone could apply some logic and help me with a problem that two plumbers have not been able to diagnose properly. Details : Unvented system. Incoming mains with prv set at 2 bar. Plumber has checked this at ktchen...
  16. D

    Unvented cylinder with no system boiler?

    our client does not want a gas fired system boiler but he wants to keep his hot water storage. Its currently open vented via an old back boiler. The back boiler has been removed and electric rads installed So can we install an unvented system without a gas boiler? The cylinder to have x2 3 kw...
    • Davidalexjeffs
    • Thread
    • boiler cylinder system unvented unvented cylinder
    • Replies: 10
    • Forum: Boilers
  17. D

    Unvented Cylinder Expansion Vessel - advice sought

    Hi, I am a homeowner, I had a new unvented cylinder (OSO DC 300) fitted in August, and had a small problem yesterday with the pressure valve dumping water and making a lot of noise. Eventually this was resolved. However, during my conversations with plumbers it appears that I have a red...
    • David C
    • Thread
    • cylinder expansion expansion vessel unvented unvented cylinder vessel
    • Replies: 21
    • Forum: Central Heating Forum
  18. T

    Unvented cylinder size for 6 ensuites

    Guys, I and another 3 engineers are perplexed. We have a 4bed 4floor house being turned into a 6bed HMO. We've calculated 45k btu for htg, and know that we are goin to have a system boiler and 300l unvented cylinder.. But 300l surely won't be enough water should, theoretically, all 6 showers...
  19. T

    USA Unvented cylinder - water pressure

    Hi, looking for advice about unvented cylinder. I had one installed as part of a horrific modular loft conversion that was recently finished. The water pressure in the bathrooms is poor, probably worse than when just had combi and I cant use two showers/bathrooms at one time which was the point...
    • Tim0212
    • Thread
    • cylinder pressure unvented unvented cylinder water
    • Replies: 150
    • Forum: Bathroom Advice
  20. DGT plumbing

    Best unvented cylinder

    Opinions please unvented fitters, what do you think is the best unvented cylinder on the market. I am G3 registered before you ask.
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