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The system is a boiler with a megaflow not a combi. I will double check if it operates with the c/heating off in the summer!
It occasionally gets brought up on the forum that people want the towel rail to be hot in the summer, based on what you are saying that can't happen with a combi. Unless you leave the CH on and rely on trv's to stop the rads operating.
Airhead-
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.
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It occasionally gets brought up on the forum that people want the towel rail to be hot in the summer, based on what you are saying that can't happen with a combi. Unless you leave the CH on and rely on trv's to stop the rads operating.
You can get electric elements for central heating towel radiators so you can use them in Summer without the heating on. Turn off rad so the water doesn't circulate, switch on electric element. We have one, though it's in the guest bathroom so we've never used it after testing to make sure it worked. We got one for the main bathroom but forgot to install it /facepalm.
konastab01
brokenbetty
So on a combi system you always need one radiator thats a bypass thats always on. This rad you dont put a thermostat on so it is only on. Thats what your towel rad could be and without seeing it Id put that a good guess from experience.
But also the best thing about a combi is that you can have heating and hot water completely separate, so as Ive said already if your heating is off and your radiator is on theres an issue but without seeing the actually way your system is or you might have a heat only boiler or a system boiler theres so many variations and things that could be the cause of the problem.
A radiator will never be piped into the hot water and if it is, then it should be changed as thats wrong.