0 kWh daily gas reads - definitely 'no-heat'?

[dataknut]

observatoryData/scripts/SERL_smart_meter_data_quality_report_v2020_08.Rmd

Line 915 in 2dd3ca3

The daily gas import read distribution looks approximately as we would expect. There is a large spike at 0 where heating is not used for a day.

Do we know for sure this is 'no heating' - does it tend to only occur in the winter?