What Is the Best Hot Water System?

November 10, 2025

Choosing the right hot water system for your home can be challenging, especially with so many different types, energy sources, and brands on the market. The best hot water system for you will depend on your household size, water usage, available energy source, and budget.


From electric and gas to solar and heat pump systems, each type has its own advantages and ideal applications. In this guide, we’ll explain the different types of hot water systems, discuss what makes each one suitable for certain homes, and highlight some of the best brands available in Australia.


Different Types Of Hot Water Systems

Before deciding which is best, it’s important to understand the four main types of hot water systems commonly used in Australian homes.


1. Electric Hot Water Systems

Electric hot water systems are among the most common and affordable options on the market. They use an electric heating element inside a storage tank to heat water and maintain it at a set temperature.

Pros:

  • Lower upfront cost compared to other systems
  • Easy to install and available in a wide range of sizes
  • Reliable hot water supply regardless of weather

Cons:

  • Higher running costs due to electricity usage
  • Not as energy-efficient as gas, solar, or heat pumps

Best suited for: smaller households or properties without access to gas.

Top brands:

  • Rheem – Renowned for quality and durability, with a range of Australian-made electric storage units.
  • Dux – Offers efficient, compact systems with long warranties.
  • Thermann – Known for reliable, budget-friendly options designed for Australian conditions.


2. Gas Hot Water Systems

Gas hot water systems heat water using a gas burner beneath the tank or via a continuous flow system (also known as an instantaneous system) that heats water on demand.

They’re generally more energy-efficient and cost-effective than electric systems, especially for households with high hot water usage.

Pros:

  • Lower running costs than electric
  • Instant or continuous hot water available
  • Not affected by power outages
  • Long lifespan with low maintenance

Cons:

  • Higher upfront installation cost
  • Requires access to natural gas or LPG

Best suited for: medium to large households, or homes already connected to natural gas.

Top brands:

  • Rinnai – Market leader in gas continuous flow systems; known for efficiency and reliability.
  • Bosch – Offers durable, high-performance systems with advanced temperature control.
  • Vulcan – A trusted Rheem subsidiary offering affordable gas storage systems.


3. Solar Hot Water Systems

Solar hot water systems are the most energy-efficient option available. They use solar panels (collectors) to capture the sun’s heat and transfer it to a storage tank. A backup electric or gas booster ensures hot water on cloudy days.

Pros:

  • Significantly lower running costs and energy bills
  • Environmentally friendly — reduces carbon footprint
  • Eligible for government rebates and incentives

Cons:

  • Higher upfront cost due to panels and tank installation
  • Performance depends on sunlight exposure
  • Maintenance of panels and system required

Best suited for: sunny locations or households looking to reduce long-term energy costs.

Top brands:

  • Rheem Solar – Leading solar systems with both gas and electric boosters.
  • Solahart – One of Australia’s longest-standing solar brands, known for premium quality and reliability.
  • Apricus – Specialises in evacuated tube solar systems for high efficiency in variable weather.


4. Heat Pump Hot Water Systems

Heat pumps are a modern, eco-friendly alternative that use ambient air to heat water — similar to how a refrigerator extracts heat, but in reverse.

They don’t rely on sunlight, making them ideal for shaded or cooler areas, and they’re far more energy-efficient than standard electric systems.

Pros:

  • Up to 70% more energy-efficient than electric storage
  • Works day and night
  • Lower running costs over time

Cons:

  • Higher upfront cost
  • Can be noisy during operation
  • Performance may drop in very cold climates

Best suited for: households wanting energy savings without installing solar panels.

Top brands:

  • Stiebel Eltron – German-engineered heat pumps known for exceptional efficiency and performance.
  • Rheem Ambiheat – Reliable, quiet, and built for Australian conditions.
  • Rinnai Hotflo Heat Pump – Compact, durable design ideal for smaller backyards.


Storage vs Continuous Flow Hot Water Systems

Aside from the energy source, hot water systems come in two main delivery types:


Storage Systems

These systems heat and store water in a tank, ready for use. Once depleted, they take time to refill and reheat.

Advantages:

  • Reliable hot water supply for large households
  • Can store pre-heated solar or off-peak electric water
  • Straightforward maintenance

Disadvantages:

  • Bulkier and require space
  • Heat loss over time from stored water


Continuous Flow (Instantaneous) Systems

These systems heat water only when you turn on the tap, meaning no storage tank is required.

Advantages:

  • Endless hot water supply
  • Compact and wall-mounted
  • Energy-efficient — no heat loss from storage

Disadvantages:

  • May struggle to supply multiple showers simultaneously
  • Requires adequate water pressure and gas flow

Best choice: Continuous flow systems are ideal for smaller homes or where space is limited, while storage systems suit families with multiple users.

Comparing Energy Efficiency and Costs

System Type Average Lifespan Energy Efficiency Upfront Cost Running Cost
Electric Storage 8–12 years ★★☆☆☆ Low High
Gas Storage 10–15 years ★★★☆☆ Medium Medium
Gas Continuous Flow 15–20 years ★★★★☆ Medium Low
Solar 15–20 years ★★★★★ High Very Low
Heat Pump 10–15 years ★★★★★ High Very Low

Choosing the Best Hot Water System for Your Home

The best hot water system depends on your household’s unique needs. Here’s a quick guide:


  • Small households (1–2 people): Instantaneous gas or small electric system
  • Medium households (3–4 people): Gas storage, continuous flow, or heat pump system
  • Large households (5+ people): Solar with gas booster or large-capacity gas storage
  • Eco-conscious homeowners: Solar or heat pump systems


Before making a decision, consider factors like your roof’s sunlight exposure, access to gas lines, and available space for tanks or panels.


The Best Hot Water System Brands in Australia

Here’s a summary of some of the most trusted brands on the Australian market:


Rheem

Australia’s leading hot water brand for over 80 years. Known for reliable electric, gas, solar, and heat pump systems designed to handle Australian conditions.


Rinnai

Experts in gas continuous flow and energy-efficient water heating technology. Offers both residential and commercial-grade systems.


Dux

A long-established Australian brand offering quality, affordable storage and instant systems backed by strong warranties.


Bosch

A global brand renowned for precision engineering and long-lasting gas continuous flow systems.


Solahart

Specialises in solar and renewable energy water heating, ideal for homeowners looking to reduce power bills and environmental impact.


Conclusion

So, what is the best hot water system? There’s no one-size-fits-all answer — it depends on your household size, energy source, budget, and long-term goals.


For energy savings and sustainability, solar and heat pump systems are the best choices. For reliability and instant performance, gas continuous flow systems like those from Rinnai or Bosch are excellent. And for affordability, electric systems from Rheem or Dux remain popular for small homes.


Before purchasing, get in touch with Celsius Plumbing to ensure you purchase the right hot water system. We'll also handle the installation on the Sunshine Coast.


Written by Justin from Celsius Plumbing

Meet Justin, the owner of Celsius Plumbing. With over 15 years of industry experience, Justin combines technical expertise with a commitment to clear communication and reliable service.

October 13, 2026
Discover how Sunshine Coast water quality varies by suburb, what's in your tap water, common issues, and how to test or improve it at home.
image of Sunshine Coast Australia
October 13, 2026
Learn how to find and read the Sunshine Coast flood map, check your address, understand risk zones, and know what to do next. Full guide inside.
October 13, 2026
Understand your Sunshine Coast water bill: who issues it, how to pay, what charges mean, due dates, concessions and tips to lower your next bill.
image of a hot water system
October 13, 2026
Hot water repair or installation on the Sunshine Coast? Compare systems, costs, rebates and tips to choose the right plumber for your home.
September 18, 2026
Rinnai vs Rheem hot water systems compared on price, reliability, warranty and efficiency, so you can choose the right brand for your home.
September 18, 2026
Considering an under sink water filter for your Sunshine Coast home? Compare types, costs, contaminants removed and installation options before you buy.
September 17, 2026
Hot water installation costs explained: average prices by system type, tank size & labour. See what drives costs up and how to save. Get a quote today.
September 2, 2026
Distilled water explained: how it's made, what's removed, and how it compares to filtered water so you can choose the right option for your Sunshine Coast home.
September 2, 2026
Low water pressure? Discover the most common causes, how to diagnose the problem, and step-by-step fixes, plus when it's time to call a plumber.
September 2, 2026
Discover practical ways to maximise water efficiency in your QLD property, from rainwater tanks to rebates, and start cutting water bills today.