Weather compensation and a proper programmable room stat are worth looking at, but don't produce heat that you can't benefit from.
Its the savings by use of optimised or compensated control that is the benefit, they don't produce heat, they save unnecessary heat being produced by calculating the heat requirement from the prevailing weather and property conditions!
But that is by controlling output into the system, not by restricting the output of the boiler which lowering boiler thermostat settings does!
To many people here are confusing boiler efficiency with system efficiency, and you cannot have system efficiency by reducing boiler output, and it is entire system efficiency that will determine savings!
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Its the savings by use of optimised or compensated control that is the benefit, they don't produce heat, they save unnecessary heat being produced by calculating the heat requirement from the prevailing weather and property conditions!
But that is by controlling output into the system, not by restricting the output of the boiler which lowering boiler thermostat settings does!
To many people here are confusing boiler efficiency with system efficiency, and you cannot have system efficiency by reducing boiler output, and it is entire system efficiency that will determine savings!