Hi, I have an old gravity hot water pumped heating system, the boiler is a reliable, but expensive, Vulcan Continental but there is a lot of noise/air in the radiators/system that I think has come from a leaky radiator valve in the hall.
I have a new valve to fit but can I do it without draining the system? Could I close all the valves on the remaining rads and just drain the faulty rad or am I just wasting my time?
The system only has one cold water storage tank in the loft and not a separate one for the central heating.
The hot water tank has an immersion heater for summer use.

Any advice would be greatly appreciated

Andrew Smith, November 2007

how do you change rad valves on unvented system?

bob a job, February 2014

Yes with a Radiator Valve Change Kit:
http://www.toolstation.com/shop/Hand+Tools/Plumbers+Tools/Radiator+Valve+Change+Kit/d10/sd210/p31768

Joe Plumb, November 2010

yes if you are changeing a valve upstairs.but you have to drain system if you are changeing a valve in your down stair area.

Graham, November 2008

you can shut off the rads but the valves could be bypassing so you may as well drain the lot down and change all the valves you can pick them up for about £10 per set off screw fix or tool station on the net,

medwards, November 2007