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Buying Guide 2026

Best Hot Water Systems in Australia — Compared

Storage tank, continuous flow, solar, heat pump — every type explained, with real cost ranges and honest advice on what suits your home.

Updated April 2026 12 min read Australia-wide
Disclosure: Some links on this page may earn Trusted Plumbers a commission at no extra cost to you. Prices and product details are accurate at time of publishing but may change. Always get at least two quotes from a licensed plumber before purchasing.

Which type of hot water system is right for you?

Your hot water system is one of the largest ongoing energy costs in your home — typically accounting for 15–25% of your energy bill. Choosing the wrong type can cost you hundreds of dollars a year in unnecessary running costs, so it pays to compare properly.

There are four main types available in Australia in 2026:

Storage Tank

Electric / Gas Storage

$700 – $2,000 supply & install
  • Lowest upfront cost
  • Simple to install and service
  • Works with any energy source
  • Higher running costs
  • Limited hot water at peak times
  • Heat loss from tank overnight
Continuous Flow

Instantaneous / Tankless

$1,200 – $3,500 supply & install
  • Endless hot water on demand
  • No standby heat loss
  • Compact — no tank required
  • Higher upfront cost
  • Flow rate limited under high demand
  • Gas models need adequate pipe pressure
Solar

Solar Hot Water

$3,000 – $7,000 supply & install
  • Lowest running costs long-term
  • Government rebates available
  • Reduces carbon footprint significantly
  • High upfront investment
  • Needs a north-facing roof and space
  • Boosted by gas/electric on overcast days
Heat Pump

Heat Pump

$2,500 – $5,500 supply & install
  • 65–75% more efficient than electric storage
  • No roof panels required
  • Strong rebates in most states
  • Noisy — not suitable near bedrooms
  • Less efficient in very cold climates
  • Needs adequate outdoor air circulation

Quick tip: If you're replacing a failed system urgently, a storage unit is the fastest to install. If you're planning ahead, a heat pump or solar system will save you more money over 10 years — especially with current rebates.

Side-by-side comparison

Use this table to compare all four system types across the factors that matter most for Australian homeowners.

System Type Upfront Cost Running Cost Lifespan Rebates? Best For
Electric Storage $700 – $1,400
High
 8–12 yrs Limited Budget installs
Gas Storage $900 – $2,000
Medium
 10–15 yrs Limited Existing gas homes
Continuous Flow (Gas) $1,200 – $3,500
Low–Med
 15–20 yrs Limited High-demand households
Heat Pump $2,500 – $5,500
Very Low
 10–15 yrs Strong All-electric homes, upgrades
Solar Hot Water $3,000 – $7,000
Minimal
 15–25 yrs Strong High sunshine regions

What does hot water system installation cost in Australia?

Installation costs vary depending on system type, location, whether a gas line conversion is needed, and local labour rates. The figures below are typical ranges for a standard residential installation — always get a detailed quote from a licensed plumber for your specific situation.

Electric Storage (170–315L)

Unit supply$400 – $900
Labour$300 – $600
Disposal of old unit$50 – $150
Total estimate$700 – $1,400

Continuous Flow Gas

Unit supply$700 – $2,000
Labour$400 – $900
Gas/flue work (if needed)$200 – $800
Total estimate$1,200 – $3,500

Heat Pump

Unit supply$1,800 – $3,500
Labour$500 – $1,000
Electrical work (if needed)$200 – $600
Total (before rebates)$2,500 – $5,500

Solar Hot Water

Unit + panels$2,000 – $5,000
Labour + roof work$800 – $1,500
Booster setup$200 – $600
Total (before rebates)$3,000 – $7,000

Licence check: Hot water system installation in Australia must be carried out by a licensed plumber. For gas systems, a gas-fitting licence is also required. Always verify your tradesperson's licence before work begins — or use our directory to find a licensed local plumber.

Government rebates and incentives in 2026

Both solar hot water and heat pump systems qualify for federal rebates under the Small-scale Renewable Energy Scheme (SRES). Many state governments also offer additional incentives. Rebates can reduce your upfront cost by $500 – $1,500 or more.

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Federal SRES Rebate (All states)

Solar hot water and heat pump systems qualify for Small-scale Technology Certificates (STCs). The number of STCs — and their value — varies by system size and location. Typically worth $500 – $1,200 off your installation price, applied at point of sale.

🏠

Victorian Energy Upgrades (VEU) — VIC

Victorian households can access significant discounts on heat pump hot water systems — sometimes up to $1,000 – $2,000 off — through the VEU program. Discounts are applied by registered retailers at point of sale.

💧

NSW Energy Savings Scheme (ESS) — NSW

NSW residents upgrading from electric storage to a heat pump may qualify for rebates under the ESS, typically $300 – $800 depending on the system and provider. Administered through registered providers.

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QLD and SA State Rebates

Queensland and South Australia periodically offer additional hot water rebate programs. Check the relevant state government energy website for current availability — these schemes open and close throughout the year.

Frequently asked questions

A like-for-like replacement (same type, same location) typically takes 2–4 hours. Upgrades from electric storage to a heat pump or solar system may take 4–8 hours including disconnection of the old unit, site preparation and commissioning the new system. Your plumber should give you a time estimate before starting.
As a general rule for storage systems: 1–2 people need 80–125L, 3–4 people need 160–250L, and 5+ people need 250–315L or a continuous flow system. The right size also depends on your peak usage times and whether you have solar panels (off-peak heating can reduce running costs). Your plumber can recommend the correct capacity for your household.
It depends on your situation. Gas storage typically has lower running costs than electric storage where gas is available. However, many Australian states are phasing out new gas connections in residential developments, and a heat pump (all-electric) often has lower running costs than both when combined with solar panels. If you already have gas connected, a continuous flow gas system is a good all-round option. If you're building or going all-electric, a heat pump is the best long-term choice.
Electric storage tanks typically last 8–12 years. Gas storage and continuous flow systems last 10–15 years. Heat pumps last 10–15 years. Solar systems (panels and tank combined) can last 15–25 years with proper maintenance. Signs your system needs replacing include rust-coloured water, irregular temperatures, unusual noises or visible leaks from the tank.
No. In all Australian states and territories, hot water system installation must be carried out by a licensed plumber. Gas work additionally requires a licensed gas fitter. DIY installation is illegal, voids manufacturer warranties, and may affect your home insurance. Always hire a licensed professional and ask to see their licence before work begins.

Ready to get quotes?

Find licensed plumbers in your area who specialise in hot water system installation and replacement — compare their ratings, then contact them directly for a quote.

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