In message l.net, at
22:06:37 on Thu, 8 Oct 2020, Dave Liquorice
remarked:
On Thu, 8 Oct 2020 20:57:01 +0100, Roland Perry wrote:

Wouldn't put the stat in a room with a heat source it's not
controlling. Wood burner makes living room nice and warm, stat is
satisfied and rest of house doesn't get any heat.

But I'm not in any of the rest of the house, Dear Liza.

*Any* heat, even if it's blowing a gale and -10 C outside...

Remember with your current short cycling, if a room cools bit that
radiators thermostatic valve opens a bit and warms the room. With the
room stat satisfied this won't happen as the boiler is forced off.

It's a small enough house that heat percolates around it even when room
rads are off. But that wasn't really my question.

I understand about the short-cycling (but in practice the bathroom rad
and the one in the former sitting room, now my office, are both warm
almost all the time the heating is on), however if the room stat simply
switches off the boiler like a timer would, does the circulating pump
stop, and does in effect turning the boiler on and off several times an
hour have any undesirable other side effects.

I'm not sure I could find a separate connection to make to the boiler to
switch it by a thermostat rather than the timer. The timer just has one
2-core connection to the boiler, plus its mains power.

It's a combi boiler and hot water is provided on demand even if there's
no controller attached to the wall.
--
Roland Perry