I asked several weeks ago how to control two furnaces but need more advice. Do you guys have separate thermostats or one that can roll to the the second furnace if the boiler goes cold. I've researched 2-stage thermostats but I'm not sure that's what to use. Since we don't have storage, I find myself turning on the propane for 30 minutes or so in the morning to knock off the chill until I get the hot water going. I'd appreciate any help pointing me where to go.