In article ,
Robin wrote:
1. The boiler requires (in the absence of an internal or external
bypass) at least one radiator without TRV.

Towel rail in the bathroom?

2. The temperature in the room with that radiator (or those radiators)
cannot be managed (to use your term) by TRVs.

A towel rail with towels doesn't heat the room by much.

3. The temperature in said room can be managed with a thermostat (which
controls the "call for heat").

--
*If you try to fail and succeed, which have you done? *

Dave Plowman London SW
To e-mail, change noise into sound.