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Thats the beauty of TRV's you can turn them off as and what you want to heat to not.
Does mean the boiler still shunts the water around the entire heating circuit (if not the rads) only to heat a towel rail presumably with the stat and timer bypassed or shut down.
Which is why you get to combination fuel towel heaters - it’s a headfuck to do it with the boiler in the summer.
Howard
konastab01
Could be a motorised value that isn't working fully but you'd need to check it out when the hot water is on itself and see if the heating pipes are still heating when its on itself.
Thats the beauty of TRV's you can turn them off as and what you want to heat to not.