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So on a combi system you always need one radiator thats a bypass thats always on
Isn't the bypass for summer internal to the boiler? The bypass radiator is for when the whole system is on, and is parallel to the rest of the radiators.
Otherwise you'd need a controllable valve outside the boiler and/or extra input and output pipes.
grams
konastab01
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.