28 Gas in dwelling (Question IX) [p.42] 1. If gas is supplied to the dwelling from a public network, then the 1 symbol shall be encircled.
2. If there is a device for heating or boiling water installed in the dwelling and the said facility is supplied with gas from bottles (of capacity of 11 kg or more), the 2 symbol shall be chosen.
The said answer shall not be chosen for dwellings which are supplied with gas from tourist bottles.
3. If there is no gas in dwelling, supplied neither from a public network nor from bottles, as well as there are no devices used for heating or boiling water, then the 0 symbol shall be encircled.