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I am not sure if 15 years ago there was the requirement to fit a room stat, I guess because my system was fitted by a friend doing it as a favour over the weekend, instead of going through the books, maybe it was something he over looked.

I am guessing if the house/room is cold, the boilers internal tank will continue to be controlled by it's thermostat, to prevent over heating, so switch on/off dependent on the water temperature returning to the tank before the room stat tells it to switch off, the radiators will get hot and the...

Just so that it is clear in my head... As there is nothing apart from the boiler to know when hot water is needed for the central heating, in the current set up the boilers internal water tank is only kept heated when the demand for central heating is switched on? When demand for central heating...

Thank you. I will have a look into room thermostats and also the manual.

Thanks for the reply; The boiler itself has a dual controller for water and heating, both can be programmed independently, daily, weekly, you can also select off/once/twice/permanently on. The flow of water is controlled by a diverter valve in the radiator, basically a spring loaded valve...

Stumbled across this forum while searching for a query I have around my boiler. (Sorry for the long post) I have a Worcester Bosch Heatslave 20/25, when it was installed (about 15 years ago), the plumber didn't fit a room stat. The rads have thermostat valves fitted, apart from the bathroom...