Well, it's not THAT good, but it's not BAD news !
Last night at the prayer meeting it was obvious that the heaters (reversible air-conditioners) were working fine. This seems to confirm what I have heard, that when the temperature REALLY plummets the heat-pumps in reversible aircons can't extract any heat to pump into your building. Hence the heating hardly worked at all at the weekend. Now, however, toasty-warm once more.
Then after the prayer-meeting I rushed into the kitchen and opened the hot and cold taps, then into the yard and opened the outside tap, then into the warehouse and turned the water back on.
Result ! The taps all flowed, no leaks, the water heater heated the water fine and the toilet flushed again.