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unvented

  1. S

    Unvented cylinder/shower valve

    Hi All I had an unvented cylinder fitted about 6 years ago. It only supplies hot water to my shower. I was hoping for a much better flow rate from the shower but it seemed no different from the original combi boiler hot feed. There is (unusually) a lever that lets me select the combi or the...
  2. P

    Isolating hot water supply - indirect unvented cylinder system

    Hello, I am fitting new taps and a shower mixer in my en-suite and was looking to isolate the hot water pipes. I have an unvented indirect heating system (have attached some photos). I was wondering if the isolation valve that would shut off the water to the hot water taps is as circled in the...
  3. W

    Pressure reliefe pouring out of unvented immersion heater.

    Hi all. So I have an OSO Super SXD 180 immersion heater and it is pouring a huge amount of water out of the cold water pressure relief valve regardless of whether the tank is heating or not. We're talking litres a minute currently. I have replaced the valve which changed nothing. I have...
    • Waterwaster
    • Thread
    • heater immersion pressure unvented
    • Replies: 2
    • Forum: UK Plumbers Forums
  4. P

    Unvented Cylinder Recommendations

    Hi all, looking for some recommendations for a slimline indirect unvented cylinder to go with a new system boiler that we're having installed soon. Only need around 120/125 ltr for our usage and could possibly make do with 100. Been looking at a few different brands including the Megaflo which...
  5. S

    Unvented extractor fan for gas cooker

    Hi guys I'm moving to a flat but where the cooker is situated. I can't get a vented extractor fan as it's the same wall as the next door flat. Are the none vented ones any good ? Which one should I be looking out for ? Or avoid ? Any tips will be helpful
  6. R

    Unvented cylinder no cold water to multiple outlets

    Hi, I’m having issues with cold water to multiple outlets. Taps, showers, toilets cold water is fine at the kitchen sink. The hot water system is a Glenhill unvented cylinder. Hot water is fine at all outlets. I assumed the cold outlets not working were from the balanced cold from the...
  7. N

    Draining an unvented cylinder

    Hi, According to the regs, can I (homeowner/DIY-er) drain and refill an unvented cylinder myself, or does that require a plumber with G3 cert? Cheers
  8. Z

    Thoughts on Prostel unvented cylinder horizontal

    Just looking at getting an unvented cylinder. Screwfix do an RM cylinder called Prostel. Anybody had experience with these. £830 for 250l horizontal.
  9. ridgerunner

    Will switch to unvented HW cylinder reduce shower performance

    Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is...
  10. R

    Will shower pressure be less if switch to an unvented HW cylinder?

    Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is...
  11. dave100

    New unvented cylinder / Replace old vented cylinder and add a ST pump?

    Hello, I am renovating a small bathroom in an apartment on the 5th floor. Heating is electric, no gas or oil. I have four (related) questions about this below. I had intended to reuse the cold water tank and the cylinder sitting underneath it but my plumber suggested I replace the cylinder as...
  12. Z

    Unvented cylinder in loft pump on landing, any problems

    So after having engineer drawings back I'm limited to around 90cm of loft height. I was thinking of a preplumbed horizontal cylinder. But now wondering if a pump and zone valves on the landing in a separate cupboard with just the cylinder flow return going to the loft. Is this an ok idea of...
  13. A

    Can unvented cylinder discharge be connected to this overflow?

    Hi, I'm looking to install an unvented cylinder in my property. I initially hired a plumber who expressed interest in the job, but later cancelled, citing "building regulations" as the reason, specifically regarding the discharge pipe and its location. Subsequently, I reached out to my second...
    • aleant
    • Thread
    • cylinder overflow unvented unvented cylinder
    • Replies: 4
    • Forum: UK Plumbers Forums
  14. M

    Unvented cylinder install query??

    Hi guys. Is there any reason you can’t can’t downsize the hot water draw off from 22mm to 15mm straight away? Other than the flow rate being affected would there be any other concerns? Cheers
  15. M

    Heat pump unvented install balanced cold

    If changing a combi boiler system to a heat pump. What do they usually do with the balanced cold connection on the hot water cylinder? Cap it. And put a pressure reducer on the mains so they have equal hot and cold pressures? I can't see them repiping a balanced cold from the cylinder to each...
  16. Z

    Preplumbed horizontal unvented cylinder

    Anyone know of preplumbed horizontal unvented cylinder apart from the Telford Tempest. My plumber has said they save a lot of time but he's fitted gledhill vertical before I think.
  17. Z

    Unvented cylinder with heat only boiler??

    I'd like to install an unvented cylinder in the loft. With limited headroom it would have to be horizontal. I want to keep my existing valiant condensing boiler. I currently have a vented set up. A couple of plumbers said this could work. Will the feed and expansion tank for the central...
  18. T

    Unvented Expansion Vessel Replacement - what else needs changing

    Potable water unvented expansion vessel needs replacing - water is coming down the tundish. What else needs to be replaced. Does the enginneer need a G3 unvented certificate to do this work and what are the consequences if he does not have one
  19. D

    Unvented cylinder with water softener

    Is there a definitive answer to this? We have a stainless steel everflo unvented cylinder hooked up to a Worcester Bosch boiler, and are thinking of getting a water softener as were in quite a hard water area. I've looked around, but can't seem to find a clear answer as to whether a water...
  20. S

    Unvented Tank Advice Please

    Hi. I have looked at similar posts but not seen exactly what I'm after ... unvented Gledhill 200l fitted a few months ago. A few weeks after and since most times when we turn on hot water tap in the morning there is a long groaning sound (I have a recording if it helps). Have contacted...

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