Installing a gas hot water system in Christchurch costs between $2,000 and $4,500 fully installed. Continuous flow (tankless) gas systems run $2,200–$3,800; gas storage systems cost $1,800–$3,200. Gas line work and installation complexity affect the total.
Gas continuous flow (tankless): Heats water on demand. Cost: $2,200–$3,800 installed. Brands: Rinnai, Bosch, Rheem. Best for households wanting unlimited hot water.
Gas storage cylinder: Works like an electric cylinder but uses gas. Cost: $1,800–$3,200 installed. Less common in new Christchurch installations.
A full gas installation typically includes: supply and installation of the unit, gas line connection (if existing), flue/venting installation, testing and commissioning, and compliance certificate from a licensed gasfitter. New gas line from the meter adds $500–$2,000 if not already present.
Natural gas is available across much of Christchurch. However, with rising gas prices and EECA rebates for heat pumps, many homeowners are switching to heat pump hot water systems for better long-term value.