Most properties in NZ which use gas for hot water and cooking are on a mains supply, however, some use bottled gas. If it is the case that bottled gas is used for hot water heating or the main form of cooking, the landlord is responsible for supplying bottles. If the bottles are rented then the landlord is required to pay the rental fee.
Whether the gas is mains supplied or bottled, the tenant is responsible for paying for the gas which is used.
It’s important to remember to include the amount of gas in the bottle or the meter reading of the mains supply on the initial and final inspection. A good rule of thumb is that the landlord supplies a full bottle at the beginning of the tenancy and the tenant at the end.