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unvented cylinder

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  1. 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...
  2. 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...
  3. N

    Unvented cylinder size

    200/210 or 250l indirect unvented cylinder... Pros and cons of both please guys, whats the thinking?? Better to go bigger, or are there other considerations to be thought of....?
  4. D

    Efficient way to heat radiators and unvented cylinder

    I have a gas boiler heating radiators and also heating an unvented cylinder. I have a Honeywell programmer which has the water heating up 1.5 hours early morning 30 mins midday and 2 hours evening The heating is on a couple of times a day. With the energy prices I am wanted to ask if hearing...
  5. W

    Unvented cylinder - noise

    Have recently had unvented cylinder installed and when hot water is run it often makes a loud prolongued noise (like a pipe bending or plsne). Any ideas? Guy who installed it doesnt know (he is apparently qualified...)
  6. R

    Any ideas on what this part is??

    Had a plumber in whilst I was on holiday to fix a leaking condensate pipe on system boiler but have noticed he’s also fitted something on my unvented cylinder on the return secondary circuit. I’ve circled the part on the two pics. Anybody got any idea of what this is? Plumber not returning any...
  7. M

    Urgent advice - Replacing gravity water system

    We need an urgent advice, we have a gravity water system and we are in a middle of loft conversion. We are adding an en-suit in loft and prefer to have a good water pressure there. What we want, is to either be able to run multiple showers at once, or if one person is having a shower, other...
  8. J

    Unvented cylinder recommendations?

    Hi all, I'm due to install my first unvented cylinder. (I've had my unvented ticket for several years, but not actually done a brand new unvented install yet). It's a house renovation, with a new hw and heating system. The house currently has an old gravity floor boiler, that will be coming...
  9. R

    Nottingham/Newark G3 Plumber/Heating Engineer Required

    Is anyone local available to help survey my current unvented heating set up including underfloor heating? Thank you 😊
  10. J

    unvented cylinder v combi store

    Hi all, My customer is renovating a house. Complete renovation of the plumbing. It's a three-bed house for a young family of 3. It will have one main bathroom (bath and maybe an over-bath shower), plus two shower ensuites. I have yet to check the incoming water pressures/flow rates to the...
  11. Fogster74

    Working on heating side of system with an unvented cylinder, no G3?

    Hi all, I'm a competent DIYer with an engineering background and am active in Heritage Buildings. I never touch anything I'm not allowed to albeit I've worked on the wet side of my own heating on the central heating circuit before when I had a combi - balancing rads, add a Fernox TF1, washing...
  12. M

    vibrating cylinder reducing valve 'standard practice'?

    Hello, I have a new unvented system with a horizontal 210L Joule hot water cylinder. The cylinder has been vibrating badly which you can hear throughout the upstairs (it's in the loft). The manufacturers have stated that there is too much flow going into the cylinder, and that the gas...
  13. C

    Humming from unvented cylinder

    Hopefully someone can point me in the right direction. Before I start I am G3 qualified. As per usual I was asked to rectify a leak on a combination valve. I installed a like for like 3.5 bar valve, all good, however I I checked pressure in exp vessel to find no pressure at all (Never been...
  14. A

    Noisy unvented cylinder advice Pls.

    HI everyone, I'm looking for some thought/opinions on what could be causing issues with noise and pressure since having a pressurised un-vented cylinder installed with an Air Source Heat Pump from a traditional gravity fed system. When it was first installed, whenever a hot tap was run there...
  15. U

    Unvented Cylinder Discharge pipe not to regs

    Hi, I'm looking for some advice on how to proceed with my current situation. We bought a new build and after getting my boiler and unvented cylinder serviced my plumber raised the fact that he estimates the D2 discharge pipe to have a resistance flow length on 12m and as it's 22mm copper pipe...
  16. O

    UK Cylinders ProLite Air twin coil solar indirect unvented 300ltr

    Hello! I have a new Vaillant boiler being installed and will install a new cylinder at the same time. Our installer is recommending a UK Cylinders ProLite Air twin coil solar indirect unvented cylinder 300ltr. According to specs the standing heat loss is 1.80 kWh/24h which seems pretty decent...
  17. AndyCoo

    Central mixing valve near unvented cylinder

    Hi all I have a mixing valve question. Should I have one fitted close to my new unvented cylinder?
  18. P

    Unvented cylinder wiring

    Hello all I'm replacing 2 unvented cylinder a which are (a) end of life and (b) installed in a way which is clearly not right (no 2 port shut off valve on the heating coils just for a start, and there are other issues). The heating coils are currently controlled with 3 port valves that are...
  19. S

    Unvented Cylinder set up via gas system boiler and time clock

    Hi I wanted some steer from he forum for my set up. 2 storey house now extended on ground and a loft conversion. New plumbing install as of 18months. Worcester bosch 8000 life sysem boiler via natural gas. Time clock with HW / CH split, 7 day digital. 250litre Gledhill Select Indirect...
  20. H

    Unvented cylinder for ASHP

    Hi all. I have an Isoflo CL170 cylinder with good few years life left in it in my system which has performed trouble-free other than the odd new immersion element. I'm getting a new ASHP fitted and the installer is recommending scrapping the Isoflo and replacing it with a Secon Trade Heatpump...
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