I am having a Combi boiler fitted in the next few weeks and have a question that I hope someone can answer. My current system has a conventional boiler which uses\diverts the hot water circulating in the coil, in the cylinder, to heat 2 towel rails, this is useful in the summer when the heating is not used. And now the question As the combi boiler has two separate circuits, hot water and heating, I will no longer be able have heated towel rails without the heating being on ( I understand I could have electrically heated towel rails). My thinking is that my Install guy will remove\disconnect\cap off the "hot water" towel piping when he removes the cylinder, 3 port valve, pump and the water tanks is this correct? I had never come across this method of heating the towel rails, without the heating being on, before I moved into this property it is such a simple but clever idea. When we first moved in I thought there must be something wrong with the system as the towel rails were hot without the heating being on, I thought the 3 port valve had a problem but then realised that only the towel rails were affected.