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Isolate both the oncoming and outgoing. Make sure to cap off any thermostatic valves properly so they can't turn on and cause 40 grand worth of damage to your house. Do not trust turning a trv to cold/off.
Seal the plumbing once removed to stop crap like plaster getting in the pipes. This could be proper end caps or tin foil and masking tape.
If you can, flush the rad while it's off.
Right... So I've got a plasterer coming tomorrow who has said their happy to help remove a fuck off big wall mounted radiator prior to starting work.
What do I need to do?
Just turn off the rad and drain? Then we disconnect it and lift it off and put it somewhere, right?
Or am I missing something?
Any "oh I wish I'd know this" tips?
Cheers.