My BIL and SIL left for a month to Belize. They turned the hot water boiler set at 45f. They also have heated floors in the kitchen and baths. An accessory gas fired space heater is mounted in a stone fireplace. The latter two were turned off. On the second week of their trip, temps fell to -10f and the boiler failed. Before my wife could make her weekly inspection and recover messages and mail, all of the radiators split, as did all the heating system piping. The water main was closed so water supply lines to sinks, toilets and baths were mostly intact. I poured RV antifreeze in all the drains.
I never asked but recovery was probably $65K --$100K.
This year, they are trying 58f on the thermostat and have a phone app to alarm about falling temps. I don't get it, $10K for the month in Belize but can't afford a monthly heating bill. Some folks.
