Gas Hot Water Installation Cost Calculator
Estimate the cost to supply and install a gas hot water system in Australia. Choose the system type and whether it replaces an existing unit or is a new install.
Your gas hot water installation details
Your estimate sits within the typical range.
Continuous flow units never run out of hot water and take no floor space, but need adequate gas supply, storage units are simpler to retrofit on an existing gas line.
Where the money goes
Estimated breakdown for your configuration
💰 Ways to save
- A like-for-like gas swap on an existing connection is the cheapest option.
- Size the unit to your household, an oversized system costs more to buy and run with no benefit.
How we estimate this
Gas hot water installation in Australia typically costs $1,100 to $4,500 in 2026 depending on the system type and whether it is a swap or a new install. A continuous-flow swap on an existing gas line is cheapest; a changeover from electric with a new gas line costs the most.
Pricing reviewed: October 2026.
Doing more than just gas hot water installation?
Build a combined estimate across every part of your project in one place.
Pricing reviewed October 2026. Indicative Australian costs, not a quote.
Understanding gas hot water installation costs in Australia
Gas hot water installation in Australia typically costs $1,100 to $4,500 in 2026 depending on the system type and whether it is a swap or a new install. A continuous-flow swap on an existing gas line is cheapest; a changeover from electric with a new gas line costs the most.
Gas systems heat water on demand or in a tank and generally cost less to run than electric where mains gas is available. The biggest variable is whether new gas and flue work is needed.
Frequently asked questions
How much does gas hot water installation cost in Australia?
Typically $1,100 to $4,500 in 2026. A continuous-flow swap on an existing gas line is cheapest; a new install with a new gas line costs the most.
Is gas or electric hot water cheaper to run?
Where mains gas is available, gas is usually cheaper to run than standard electric. Heat pump and solar electric can be cheaper again, but cost more upfront.
Are you a plumber?
Everyone on this page is working out what gas hot water installation costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.