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Draining system

  • 08-10-2010 1:04pm
    #1
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭


    How do you drain the water from a central heating system? I want to fit a few thermostatic valves on a few radiators in the house. Also, a friend suggested putting an additive into the central heating to prevent corrosion. Anyone have any more info on this? Thanks for the help.

    K


Comments

  • #2
    crosstownk
    Registered Users, Registered Users 2 Posts: 12,863 ✭✭✭✭crosstownk


    There should be a drain valve somewhere. Usually near the boiler and it can be quite low - it should be lower than the bottom of the lowest radiator. If you're only fitting valves to upstairs rads then you won't need to drain the whole system. Sometimes there may be a drain valve fitted near/on the boiler which will suffice for partially draining the system.

    You can get an additive for the system in most DIY shops. I got Fernox additive in B&Q last year.
    Untitled Image




  • #3
    Buford T Justice
    Registered Users, Registered Users 2 Posts: 6,262 ✭✭✭Buford T Justice


    Are you using a vented or unvented system?


  • #4
    kkelly77
    Registered Users, Registered Users 2 Posts: 1,673 ✭✭✭kkelly77


    crosstownk wrote: »
    There should be a drain valve somewhere. Usually near the boiler and it can be quite low - it should be lower than the bottom of the lowest radiator. If you're only fitting valves to upstairs rads then you won't need to drain the whole system. Sometimes there may be a drain valve fitted near/on the boiler which will suffice for partially draining the system.

    You can get an additive for the system in most DIY shops. I got Fernox additive in B&Q last year.

    The system in my house is a bit odd in that the boiler is located downstairs.
    Fingers McGee wrote: »
    Are you using a vented or unvented system?

    It's a vented system


  • #5
    Sparkpea
    Registered Users, Registered Users 2 Posts: 1,118 ✭✭✭Sparkpea


    tie the ballcock up in the header tank so no more water enters the tank

    turn off the central heating so that it wont come back on

    check around the boiler for something that looks like this

    draincock.jpg

    it should be bottom left or bottom right of the boiler but could also be at the front

    if theres one of these on it get a hose with a jubliee clip on it and secure and put the hose into a drain. put a towel under the draincock where the hose connects onto as it usually drips a little. open the drain with a spanner then start to open the radiator vents from the highest point then to the lowest once its drained down a bit.

    if you dont have a draincock on then u need to lift a radiator down and put a hose on the radiator valve.


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