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Hydro air and thermostat settings

stehman Member Posts: 2
I have a hydro air system (Viessmann) that uses propane and have installed a Honeywell RTH2300 thermostat. I have set it to gas or oil. In the advanced installation settings do I set it as (5) gas or furnace or (3) Heat pump, hot water or high efficiency furnace?


  • Jamie Hall
    Jamie Hall Member Posts: 22,114
    3. Your hydro-air system behaves much more like an hydronic system in terms of cycle timing (which is really what you are setting) than like a forced air system (which would be 5 or 6). Gas or oil boiler (2) may work too; you could experiment and see which gives you more even heat.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England