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Wireless Thermostat

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I have an old 3 story home that has been duplexed. It has a gas fired hot water boiler (hydronic).

It currently has a hard wired thermostat in the lower apartment and no control for the upper unit.

What make/model of a wireless thermostat would be suitable. It does not require a fan switch/cool mode as for the typical forced air/AC units.

There are no "zones" in the system and l just wish to let the upper unit control the temperature in the building.

I have spent 15 minutes with the Honeywell assistance phone centre (IN INDIA)..no answer

Thanks
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