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Robert11 Robert11 is offline
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Default Digital Heat Thermostat: If Batteries Run-Down, What happens ?

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