My water meter is in storage room that has a louvre window (no glass) and is particularly close to the the louvres so probably gets to the same temperature as the outside. A few times in the last week my water supply has stopped. I assumed it was because the pipes were un-lagged so I lagged these pipes but I didn't have anything to lag the meter. It was about -6 or -7 deg C last night and the water stopped again. Is the meter a positive displacement pump and do they freeze easily? I am going to cover the louvre with a sheet of polystyrene sheet to see if that will work.