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[Your problem is that you are producing too much heat for too little water.] I will live with this for now.

S Plan +. I really do seem to have quite a system! I have looked at the 3-zone S Plus. I have the 3 zones but with only 2 zone valves: one for downstairs and one for upstairs. The hot water cylinder is always in circuit. It has big enough well insulated pipes to and from the pumps to allow...

I need to study S Plan Plus via Google...

[I am hopeful of something a bit more sophisticated with maybe two setting dials: one for burner start, the other for burner stop.] It appears that such a thermostat does not exist?

Thank you, My house has two heating circuits: one for upstairs, the other for downstairs. The upstairs has its motorised valve in the return pipe to the boiler, The downstairs has its motorised valve in the feed pipe from the boiler. The hot water cylinder is connected between the two circuits...

My existing Cotherm BBSC0063 thermostat has a cylindrical sensor which pushes into a tube on the side of the boiler. Wires lead from the thermostat to stop/start the Riello burner. (There is also a coiled overheating sensor, 110C). I am hopeful of something a bit more sophisticated with maybe...

I need to prevent my boiler stop/starting so frequently. I need a thermostat/aquastat where I can set the upper and the lower temperatures, ie the water temperature range. Does such a thing exist?