Hello:
Have a gas, forced hot water heating system. Was about to order a Honeywell thermostat over the web, but had the following concern which just dawned on me.
Am interested in their digital model RTH 5100 which is non-programmable.
It says on their ad sheet that it maintains the set-point if there is a power outage. O.K., that's great.
But even if there is house power--
These units require a battery or two.
What happens if the battery runs down while you are away ? I know, use new, fresh, batteries, etc. But-
Will the furnace shut off if battery runs down ?
Or, is the battery only for the display, and the circuitry still works ? If so, how, as there's no current when the circuit is calling for no heat thru the 2 wires.
e.g., with no thermostat battery voltage, does the curcuitry default to a circuit closed condition, which would keep the furnace active, or... ?
A bit worried about this.
Thanks, Bob