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unvented cylinder

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  1. T

    Shower Pump on air to water Unvented Cylinder?

    Hi, I'm in my new build 2 years and the shower pump has died. I have an air to water unit downstairs is in the utility which I've been told is unvented and pressurised. The cold water feed into this cylinder is from the attic tank, not the mains as I turned off the mains stopcock to see if hot...
  2. M

    Unvented cylinder D2 pipework installation to toilet waste pipe

    Hi guys, just want to get advice, i want to replace venten to unvented cylinder, is it ok to install D2 pipe to toilet waste pipe see picture? as there is no easy options to get it outside.
  3. T

    Megaflow CL120 Backflow issue.

    Hi, Hi wonder if anyone could help? I have a customer that has recently had backflow problems with her cylinder. She gets very hot water coming through her cold taps in her 3 floored property. I recently changed her ground floor basin taps and in doing so had to drain down the cylinder as a...
  4. C

    Ariston Classico HE STD 150 unvented cylinder leak

    Good evening, I'd like your opinion on something that is worrying me please: my landlady's plumber replaced the bottom/night element of my 20-year-old unvented cylinder (an Ariston Classico HE STD 150) 5 days ago and I hadn't noticed that it was leaking. He fixed the leak today but now the...
  5. M

    Composite valves unvented cylinder

    Do most composite valves now for unvented cylinders have a tee on them For the expansion valve connection? The ones I used to fit just had the balanced cold connection coming of it. Them I tee'd off downstream of the composite valve for the expansion
  6. S

    hot water not staying hot in an unvented system

    hello we have an unvented system. we have an issue where the hot water is hot for 10 seconds and then luke warm, turn off taps / wait and turn back and it repeats itself. had boiler checked and told it was the expansion vessel. Had the expansion vessel drained and recharged. plumber told me...
  7. P

    Unvented Cylinder Single coil heat pump vs twin coil solar

    Hi, I'm looking to purchase a 300L unvented indirect cylinder to work with a standard heat only boiler. I may have solar panels in the future, but likely the PV kind rather than the thermal kind, and won't be having heat pump in the future. So the cylinder would be connected to the boiler at...
  8. nashant

    Vibration when first opening hot tap after u/v cylinder heating cycle

    Hi all. As the title says, I have a problem with an unvented cylinder I had installed last year where the first time I turn a hot tap on after the cylinder has been heated I get what sounds like a vibration. It generally starts about 1s after I open the tap and lasts for about 1.5s. I've...
  9. 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...
    • Paul0090
    • Thread
    • hot water supply indirect isolating unvented unvented cylinder
    • Replies: 2
    • Forum: DIY Plumbing Forum
  10. 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...
  11. 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...
  12. 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
  13. 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.
  14. S

    Pressurizing a vented cylinder

    Hi guys, I have a question regarding converting an open vent system (copper cylinder) to pressurized, reason being not enough drop from the loft to power a shower, while i know the common advice is to buy a special unvented cylinder I can see no reason why an unvented copper cylinder cannot be...
  15. 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...
  16. 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...
  17. 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...
  18. 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
  19. 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.
  20. cotswoldmark

    Leaking Water cylinder, behind anti corrosion system

    Hi - I have a plumber booked in to look at this, but I would also like to understand myself what is causing the issue we have. We have a slow drip of water coming from behind the anticorrosion unit on our Ariston unvented water cylinder. The pink "nozzle" behind the Protech unit appears to be...
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