Annual demand

I noticed a few installations on have zero in the kWh/m² column, including mine, which I suspect is due to them not having the annual heat demand figures.

May the annual heat demand figures for space and water heating be based on historic household data? I have a record of our annual consumption for the last couple of years.

Or should it just be what the installer has calculated as part of the heat loss survey?

Apologies, just found this thread… Annual Space Heating Demand - Getting Started / FAQ - OpenEnergyMonitor Community

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