Afternoon folks,

My current heating hot/water setup is a 25 year old boiler (in good order, no plans to replace), a Randall 103 old-school timer, the water is gravity fed with big cold tank in the loft and a yellow cylinder in the airing cupboard, a circulation pump, NO motorised valve and every radiator has a thermostatic valve.

This is unsatisfactory as the Randall offers no flexibility at all, and the minimum run time for each on/off cycle is about an hour, and throughout that on cycle the pump runs continuously.

I wish to install a nice Nest thermostat and have total control over the hot water and heating and get rid of the stone-age Randall timer clock. I already know that I will need to install a motorised valve in the airing cupboard plumbing.

The installation guides for Nest concentrate on simply replacing an existing stat, which I don't have, so I'm a little unsure on what will need doing.

I'm after some advice on what will need wiring and how.

Thanks in advance.
Jon