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Cool project.

Speaking of newish natural gas (CH4) heaters, they all should have modulating thermostat capability with OpenTherm/eBus or other protocol. Combined with a thermostat with outdoor temperature sensor system efficiency is increased a few percent and that should help offset thermostat and installation costs. In the end you have more efficient modern heating system.

Same should apply for heat pump systems.

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OpenTherm is a cool idea but even new installations aren't always wired for it. When installing a new smart thermostat I found the installation has been wired as S Plan with the few cables running between the boiler location and valves location already consumed. Makes the job much bigger if you're not prepared for it.

There are many wireless OpenTherm thermostats. Wired is better but is not required for modern thermostats.

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