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temperature control valve is leaking how do i replace it?

my central heating is leaking and i want to replace the radiator valves how do i drain the system it is old and water is heated from back boiler
brian, July 2009
Shut off the water at the feed & expansion tank, or turn off thecold feed if you have a primatic tank. Open the drain, open the radiator bleed points, then when water has stopped coming out of drain replace the valve and re-fill the system.

Ian, July 2009
to long winded to go through all that on here.

look in google.

hi-spec plumbing & heating (essex), July 2009