-In a setting where we are looking at apartments or homes we assume a single household uses 13kgs of gas in a month .You can the multiply this with the number of units to estimate usage per month.

-Depending on how often the developer plans to supply say monthly or quarterly then he is well informed on the most preferable size .

-This driven by a lot of factors such us size of the bullet tank and amount of pipe work required . We can only advise after site visit.