In an earlier contribution to this discussion,
Dysanovic wrote:

The subject contains my question! Removed a radiator as I've just got
a room plastered. I'm going to replace the radiator once I've painted
the room. The lockshield valve and a Drayton RT212 TRV valve are
still in place.

Is it safe to use the heating while the radiator is missing?

Yes, provided you drained *only* the radiator and not the pipework, prior to
removing it.

How did you go about draining it?

Be careful with the TRV - it may open and pee water out into the room if the
weather gets cold, even when turned to its minimum setting. Ideally, you
should remove the thermostatic head *before* draining the rad, and replace
it with a screw-cap which should have been supplied with the valve for this
very purpose. That will hold the pin firmly down whatever the temperature.
Alternatively, find something which will screw onto the outlet (i.e. with
the same thread as the radiator tail union) in order to seal it.
--
Cheers,
Roger
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