RecordWhat it showsWhere you get it
Gas or electric bill for the month of the loss
Usage in line with the same month last year. A bill that drops to almost nothing says the furnace stopped burning fuel.
Your utility account online, usually with 12 months of usage history.
Smart thermostat history
The set point and the actual indoor temperature, hour by hour, up to the day the pipe split.
The thermostat app. Take screenshots now: some apps keep only a few weeks.
Furnace or boiler service invoice
That the heating system was looked after, and when it was last checked before winter.
Your HVAC company. Ask for every visit in the last two years.
The person who checked the house
Dates someone went in, saw the heat running and found no water, if you were away.
Texts or a written note from the neighbour, relative or property manager, with dates.
The plumber's invoice and the split section of pipe
Where the pipe ran (an outside wall, a crawl space, an unheated garage) and how it failed.
Ask the plumber to describe the location in writing and to leave you the cut-out piece.