Our oil boiler is a gravity fed non combi system.
Divertor valve has two pipes only and is wired directly into hall thermostat (i think this controlls if boiler heats hot water tank or radiators), it is not electrically connected to boiler or hot water tank in any way.
Boiler timer box is in kitchen and is just a simple on off timer, if it is turned off boiler is off, so that is ok.
But if timer is on, i.e in evening and we have hall thermostat set to 20 , but hall temp is 22 then boiler keeps cycling On and off for no reason (tap water is very hot) boiler does have its own thermo stat but is turned down to a sensible place).
Would like boiler to turn off completly if hall thermo stat tells it to,. But this may mean in summer when hall thermostat is mostly off we woud get no hot water.
Was thinking could replace timer with a https://www.plumbnation.co.uk/site/honeywell-cm927-wireless-7-day-programmable-room-thermostat/?gclid=CPSczuXNwcICFW3MtAodBTAACg
This would controll both timing and thermostat directly to boiler. could the divertor valve be disconnected and just left in one position would the hot water going through radiators still flow through the coils in hot water ank.
Longest post in history sorry