How Much Does a Hot Water System Cost?

How Much Does a Hot Water System Cost in 2026?

Choosing a new hot water system is no longer just about the sticker price. In 2026, the total cost of ownership is defined by three factors: upfront price, available government rebates and long-term energy efficiency.

This page provides an approximate guide on the overall costs associated with various hot water system types. Prices shown are an estimate and can change at anytime. For pricing and guidance specific to your unique situation, speak to the our team of expert hot water plumbers today.

Hot Water System Types & Service

To begin with, let’s take a look at the different types of hot water systems, as well as the varying kinds of hot water service. To begin with, you typically will choose between two types of hot water system types:

• Storage: Storage systems store heated water in an insulated tank until the water is needed.
• Instantaneous: An instantaneous heater, also called a continuous flow system, heats water as and when it is needed.

Once you have decided on a hot water system type, you can then choose a hot water system service. While prices vary per brand (e.g. Rheem, Rinnai, Stiebel Eltron), the following represents the average market supply (not inc installation) costs in Australia in 2026:

• Electric: Offered in both storage and instantaneous systems. These systems are a great budget friendly option, with a lower upfront cost of around $550-$2,100 depending on brand and model.
• Gas: Available in both storage and continuous flow systems, for either LPG or natural gas. These systems are increasingly in high-demand, with typical unit costs sitting around $850-$1,900 depending on brand and model.
• Solar: Offered in either electric boosted or gas (LPG or natural) boosted. Solar hot water systems are great for households with high solar exposure, ranging between $3,800-$7,500 depending on brand and model.
• Heat Pump: Operates by extracting the warmth in the outside air to a heat exchange system that then heats the water. Heat pump hot water systems are a strong option for energy conscious households, with unit costs averaging around $2,800-$5,200 depending on brand and model.

Average Annual Running Costs:

Now you need to consider the running costs associated with your chosen hot water system. Estimating these costs can be tricky as these figures are based on hot water system type, system size and whether you are eligible for rebates and incentives. In 2025, Sustainability Victoria estimated the average running costs for the various types of hot water systems. The data they gathered illustrates how dramatically running costs vary. However, this data strongly illustrates:

• Heat pump hot water systems are the lowest-cost option, especially when paired with rooftop solar and time control.
• Solar hot water is among the cheapest options, depending on household size and booster type.
• Gas hot water system running costs sit firmly in the middle.
• Electric storage systems are typically the most expensive option, across a range of household sizes.

Government Rebates & Incentives

A critical influence on hot water system pricing in 2026 is government rebates and incentives. South East Queensland specifically has a range of schemes available, such as:

• Federal STCs: Small-scale Technology Certificates (STCs) remain a primary discount, typically worth $900 – $1,200 off the point-of-sale price for solar and heat pumps.

• Queensland Residents: The QLD Business and Residential Energy Saving schemes offer additional rebates of up to $1,000 for eligible high-efficiency upgrades.

What Influences Installation Costs?

There is a reason why installation costs are so hard to estimate. Many households have unique circumstances which will influence the final installation costs. What are some of these factors?

• Fuel Switching: If you’re switching out fuel type, this can influence final costs significantly. Switching from gas to electric (heat pump), requires an electrician to run a new circuit to your switchboard.
• Relocation: Moving the unit from inside a cupboard to an external wall or vice versa.
• Tempering Valves: To comply with plumbing standards, a tempering valve is mandatory to prevent scalding by limiting tap water to 50°C.
• Safe Trays & Drainage: Crucial for indoor installations to prevent structural water damage.

What Size Hot Water System Do You Need?

Calculating your ideal hot water system size is dependant on your household size, number of people using the water and how often it will be used. To help calculate this, we have made this handy hot water system size calculator.

Why Choose Fallon Solutions for Your 2026 Upgrade?

Fallon Solutions has been SEQLD’s choice of hot water plumber for more than 60 years, with duel-trade experts who can handle both the plumbing and electrical requirements of hot water system installation and repairs. We operate across all of Greater Brisbane, the Gold Coast and the Sunshine Coast, 365 days a year.

For expert, same-day service call us on 1300 054 488 or contact us here.