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I was looking for a very simple optimiser "timer" control panel that
can be fitted to a domestic gas powered central heating system.

It is a combi - instant hot water boiler.

The optimiser will be to replace an existing standard timer clock that
is separate from the boiler.

Most of the optimisers that I have come across are either too complex
or expensive.

Honeywell CM67 with the optimisation function is what you need.