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CBF. You have missed the point. Re plumbing was not a viable option when the boiler was replaced without ripping the place apart. I wanted remote internet control added recently for a variety of reasons not just cost savings. It was only because i had remotely swithched the CH OFF whilst...

Gas112, Yes it is a rebadged Ideal boilerl. Model Number 380 RD1 which according to the manual is suitable for gravity HW systems. Having read all of the advice given on this forum and as an electrical engineer I am now convinced that the stat has always been wired incorrectly and that the...

Agile - I think you have identified the problem and it would seem the stat may have been wired wrong by B Gas when the boiler was changed 7 years ago. And maybe the boiler they installed was not suitable for Gravity feed system without pump. I will take it up with them. DP - sound comment ...

Tony When tank is warm and stat turned down the boiler continues to fire on and off to keep temp up. NO the pump for the CH systemt does NOT run. As I said earlier - with CH OFF and HW set for ON but with stat set to minimum boiler fires and heats tank to very hot (temp of boiler stat...

The HW system does NOT have a zone valve. There is one in the CH circuit that I had fitted a few years ago to segregate upstairs and downstairs radiators. But as I say the 28mm pipe for HW goes to and from cylinder with nothing in the line. Thanks for your reply. If more info helps here...

Yes that is exactly how it is Pete Have seen some diagrams on this site which show gravity systems exactly how mine is. System 30 years old and had a hot tank stat then! 7 years ago B Gas replaced boiler and tank still using the old stat fastened to side of HW tank via a cut out in the...

I have an old heating system - pumped CH and gravity HW. Hot tank has a thermostat and I have a British Gass MyHome remote thermostat and transmitter for CH. The main timer is set to ON for CH so that remote MyHome can work. This of course means that linked WH controll sets to ON. Problem is...