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Do thermostats have to be matched to the zone valves. My contractor changed the thermostat from a round Honeywell Mercury type to a new digital model 3000. With both thermostats old and new the thermostat cycled quite a lot and is turning on and off in short intervals like it is trying to get a very small temperature gain less than .5 degrees I estimate. Because the boiler is controlled by the thermostat I am getting these short boiler runs which has me concerned.
Is it possible to get a new thermostat with adjustment to increase the temp difference so it stays on longer and cycles less .Any advice is appreciated.