On Sat, 23 Nov 2019 16:25:04 +0000, Steve Walker wrote:

Assuming a heat-only sysem with boiler, pump and radiators
(emitters!!), apart from a thermostat what controls would be
needed
other than a timer ?.

Thermostatic valves on radiators if you want to heat some rooms more
(or less) than others.

Pump in parallel with the boiler power connections from a 'stat
switching mains will just not have an overrun facility.

A change over pipe stat will sort that though

/ Room Stat
/
+V ----+----o o----+---------- Boiler
| |
| |
| o cold
| \
| \
| o------- Pump
|
|
+-------------o hot

--
Cheers
Dave.