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unvented

A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane or butane.
Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented.

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  1. M

    Yellow water from new unvented cylinder

    Has anyone experienced this before. Converted gravity hot water to new unvented cylinder (150l indirect evocyl) filled the cylinder up and had yellow water for about half an hour before it started to clear. Any ideas from anyone. I’m G3 registered. Was converted due to suspected split coil in...
  2. J

    Problems running multiple outlets with unvented system in new build

    Got a brand new 25mm hdpe incoming main with pressure of 2/2.5 bar. Need to check flow rate but doesn’t look great at kitchen sink. The main connects to stopcock and is run in 28mm directly to cylinder which is located on 2nd floor of a town house. Hot and colds are run out in 22mm. It serves a...
    • jimmy84
    • Thread
    • america build multiple new new build outlets problems running system unvented usa
    • Replies: 10
    • Forum: USA
  3. D

    Unvented system and expansion tank pressurisation

    I've recently had a prv changed by a British Gas engineer under the homecare contract that I've taken out. The valve had failed and water was pouring out from the overflow pipe. The valve was replaced without too much issue. However, the red expansion tank above the boiler was NOT re-pressurised...
    • depr11259
    • Thread
    • america expansion system tank unvented usa
    • Replies: 14
    • Forum: USA
  4. I

    Unvented cylinder installation

    Hi All, We want to replace vented with unvented cylinder but cannot find any decent plumber in North West London to carry out the works. Every plumber I have called doesn't even bother to check water pressure or even flow rates. Not even British gas. Not sure what to do now. Currently have...
    • ImranF
    • Thread
    • america cylinder installation unvented unvented cylinder usa
    • Replies: 5
    • Forum: USA
  5. J

    Unvented cylinder waste

    Hi, 1st fixing a house. Im looking at the blow valve for an unvented cylinder There's no external wall near the hotpress so I'm gonna run a waste pipe under the floor. It'll have a tundish so they can see if it's discharging. What I'm wondering is if I can then tee that waste in with the pipe...
    • Jamesplumber92
    • Thread
    • america cylinder unvented unvented cylinder usa waste
    • Replies: 13
    • Forum: USA
  6. Macaque321

    Unvented cylinder in cellar with drain hatch

    I've just bought a Victorian house that needs renovation. Currently there is a boiler and hot water tank in the cellar, and tanks in the loft. I'd like to have an unvented cylinder installed in the cellar, but the plumber I got in said that it needs to have access to an open drain. There is a...
    • Macaque321
    • Thread
    • america cylinder drain hatch unvented unvented cylinder usa
    • Replies: 4
    • Forum: USA
  7. R

    Ariston STI 150, unvented indirect cylinder.

    My house (old) has a heating system installed with a Protech Anti corrosion system, I don't know how old the cylinder is, which is showing signs of rust from around the Protech box! I can see the outside skin of the cylinder is thin mild steel, but thought the core was stainless steel? Is such...
    • Roger the old
    • Thread
    • america ariston cylinder indirect unvented usa
    • Replies: 3
    • Forum: USA
  8. I

    Over-pressure on CH, but expansion tanks fine and related to unvented tank

    Not looking to fix this myself but could do with some insight as to what’s wrong…due to sell the house on a few weeks and not comfortable doing that without this being fixed. CH pressure getting up to 4-5 bar and pressure relaxing through the 3 bar pressure relief valve. Connected to unvented...
  9. 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?
  10. 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...
    • Adam-Robinson
    • Thread
    • america cylinder demand gledhill hot hot water unvented unvented cylinder usa water
    • Replies: 24
    • Forum: USA
  11. J

    URGENT 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
    • bills boiler booster fault high leak pp170e super unvented water heater
    • Replies: 10
    • Forum: Central Heating Forum
  12. 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...
    • JohnB-2233
    • Thread
    • advice america central heating system heating hot hot water hybrid unvented usa vented water
    • Replies: 7
    • Forum: USA
  13. 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...
  14. 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...
  15. 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...
  16. 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
    • Gussie 3
    • Thread
    • america megaflo morning motorised motorised valve position unvented usa valve
    • Replies: 1
    • Forum: USA
  17. 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...
    • Jennie
    • Thread
    • america cylinder unvented unvented cylinder usa
    • Replies: 4
    • Forum: USA
  18. 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...
    • NewHouseOwner
    • Thread
    • america indirect low pressure pressure unvented usa
    • Replies: 4
    • Forum: USA
  19. 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...
    • Joshmelv
    • Thread
    • america cylinders hot unvented usa
    • Replies: 2
    • Forum: USA
  20. 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...
    • CP Plumbing
    • Thread
    • america certificate cylinder hot water instalation unvented unvented cylinder usa
    • Replies: 15
    • Forum: USA
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