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unvented

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  1. T

    replace thermostatic mixer shower valve (mains pressure unvented system boiler system)

    With a thermostatic mixer showers, can you replace the unit, in a mains pressure unvented system boiler configuration, by just turning the cold mains off at the stopcock when the water supply enters the property? Will the hot and cold water stop flowing if you turn the mains water off?
    • Topslice
    • Thread
    • boiler mains mixer pressure replace shower system thermostatic unvented valve
    • Replies: 2
    • Forum: Boilers
  2. A

    Gledhill Unvented Cylinder Loud Bang Hot Water Demand

    Recently had a new heating and hot water system retrofitted in a domestic property. Previous hot water system was gravity fed with a vented cylinder. New system as shown in the photos. Installer commissioned system about 3 months ago and all was working fine. There have since been two faults...
  3. J

    Santon PremierPlus unvented boiler - super high bills

    Disclaimer: I know very little about boilers so sorry if my assumptions are way off! From testing by logging energy usage, and that if I turn the boiler on the meter lights up like a Christmas tree, it seems our Santon PremierPlus boiler (PP170E) is constantly running causing extreme energy...
    • joshuab
    • Thread
    • boiler high unvented
    • Replies: 10
    • Forum: Boilers
  4. J

    Advice on hybrid configuration - vented heating with unvented hot water

    Hello everyone, Please can I have your advice on this hybrid configuration that involves vented heating & unvented hot water ? I currently have a regular boiler (Worcester Greenstar 24 RI) running in a vented system, with cold water storage tank in the loft and also an heating F&E tank in the...
  5. M

    fast recovery unvented cylinders

    I need a fast recovery unvented cylinder for a job, 250L and I want it to have 28mm hot and cold connections. Can anyone point me in the right direction?
  6. Stants

    Pipework type / design for Unvented Cylinder ( 170 L Megaflo Eco )

    Hi I'm tying / hoping to run a drain for an Unvented indirect cylinder I need to run it now as I want to close in the building ( its in a loft conversion ) I'm having great difficulty getting someone to fit the whole system for me , it was being done by a guy but now he can not do it as...
  7. S

    Unvented cylinder discharge into 1980s Marley plastic rainwater hopper and pipe?

    I live in a shared building with a flat above me. My upstairs neighbour has just fitted an unvented hot water cylinder. The plumber has run the 22mm copper discharge pipe into the old plastic Marley hopper and downpipe, which discharges straight into the sewer. This downpipe also carries...
  8. Scott_D

    Boiler and unvented into an airing cupbaord

    Anyone got any pictures of jobs you have done like this? Im quoting to cram a system boiler and 210l unvented into an airing cupboard but not sure if its possible, I will be a rear flue vaillant 700mm high and the cylinder is 1500mm high, expansion could go in the loft
    • Scott_D
    • Thread
    • boiler unvented
    • Replies: 13
    • Forum: Boilers
  9. M

    Unvented cylinder constantly sounds ‘on’

    Hi, I have an unvented cylinder and lately even without the boiler central heating or hot water ‘on’, the system sounds like it’s constantly ‘on’. All through the night, it used to be silent except when running, but now it can sound like it’s ‘on’ constantly for days at a time. Surely this...
  10. Jock Spanners

    Has anyone fitted a hybrid ASHP/solar thermal/unvented cylinder system with gas boiler back up?

    Good Afternoon All, This is my first time on the renewables forum so please forgive my ignorance. I've been interested in ASHPs for about 15 years but have always doubted their economic viability - especially for retrofits. Now that there will be no gas connected to new builds in 4 years I am...
    • Jock Spanners
    • Thread
    • boiler cylinder gas engineer system thermal unvented unvented cylinder
    • Replies: 9
    • Forum: Boilers
  11. G

    Morning unvented megaflo motorised valve position

    Morning Is there a maximum distance from the megaflo that the hot water motorised valve connected to the cyl stat ? moving tank from cupboard to attic Cheers
  12. J

    3-tee rule on unvented cylinder

    Hi all, Just getting my head in a twist regarding the 3-tee rule (last tee on the return pipe should be hot water). I have a customer with an unvented installation, with two 2-port valves for CH and HW. He's built an extension, and wants to add a new circuit of radiators to the system. The new...
  13. N

    Unvented Indirect / Low Pressure

    A local firm have quoted for an unvented indirect Megaflo cylinder to cure low pressure hot water around the entire house to run off an ancient Kingfisher 2 boiler. Mains cold water to the kitchen sink is good but all other cold and hot water around the house is dire. Is this a good solution...
  14. J

    Unvented Cylinders Hot Distribution

    Unvented Cylinders sealed system - I am looking to start doing more unvented heating installs having become well versed to fitting combis , my question is if you situated a unvented cylinder in a downstairs location with multiple appliances upstairs would the hot distribution pipe have adequate...
  15. C

    Unvented cylinder certificate

    Hi guys I've done my G3 in December as I needed to fit an unvented cylinder in a restaurant. I said to the client to notify BC about the installation. The restaurant is new so BC came around a couple of times for inspection. I said to the owner that they will have to give him the certificate...
  16. D

    Do I need an unvented hot water cylinder?

    Hi there, we are due to have a new shower room built in a loft conversion. We are a family of 5, with one existing bathroom. Will we need to have an unvented hot water system installed to enable the 2 showers to run successfully at the same time? Pressure and flow at house is 2 bars/18 litres...
  17. B

    Vented or Unvented Cylinder

    Hello Would you recommend a vented or unvented cylinder? I have an indirect vented system at the moment. The flow rate from the upstairs taps is low. We are having solar thermal installed and thus the cylinder will be changed. We can have a new vented or unvented cylinder installed. What...
  18. C

    Boiler wattage for use with unvented cylinder

    Hi The gas boiler is getting old and so at some point will need to be replaced and I am trying to calculate what size it needs to be for best efficiency. The system is zoned with Zone 1 being 15KW of radiators, Zone 2 being 10KW of radiators, Zone 3 being a Centerstore Solar 300L unvented hot...
    • colin_
    • Thread
    • boiler cylinder unvented unvented cylinder
    • Replies: 19
    • Forum: Boilers
  19. P

    Unvented cylinder inspection

    Hi Lads/lasses just wanted some advice on unvented cylinder inspection. I just took on what seems to be a contract for a block of flats all with direct heating via immersion. The way they have been installed seems a bit off as there is no check valve on the supply to the cylinder. It goes, Stop...
  20. Husk24

    World Heat unvented Cylinder question

    Hi guys I am having my current cylinder replaced with a World Heat superflow indirect cylinde as im upgrading to solar thermal via a grant. I asked the supplier if they are replacing the immersion heating thermostat and the thermostat thats connects to the boiler and I was told if I want that...
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