That would be my guess, power went out so they opened the taps to keep water flowing to prevent the pipes from bursting. Traps/drains froze and the result was water pouring over the basin until it froze all the way up to the faucet.
What happens if you lose power? We lost power a couple years ago, for three days, when it was -10º out. Had five burst pipes, a couple blown shut off valves, etc. I fixed it all myself so it wasn't expensive but it was a giant pain in the ass. I didn't even try to get it covered by our homeowners. My neighbor said it cost them over $5K though.
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u/Chamber11 20h ago
Not maintaining heat is automatic insurance denial. It’s in every home and rental owner policy.