Hot water is something most homeowners don’t think about—until it suddenly stops working. Whether you’re replacing an old system or planning a renovation, choosing the right hot water system is essential for comfort, efficiency, and long-term savings.
For homeowners across the Sunshine Coast, the right system depends on household size, water usage, energy preferences, and budget. In this guide, we’ll walk you through everything you need to know to make the right decision.
Types of Hot Water Systems
There are several types of hot water systems available, each with its own advantages depending on your home and lifestyle.
Electric Hot Water Systems
Electric systems are one of the most common options in Australian homes. They are generally affordable to install and suitable for small to medium households.
They work by heating water in a storage tank using an electric element. While installation costs are lower, running costs can be higher depending on electricity prices.
Gas Hot Water Systems
Gas systems heat water using natural gas or LPG. They typically provide faster heating and lower running costs compared to electric systems.
These systems are ideal for households with higher water usage, as they can deliver consistent hot water without long delays.
Instant (Tankless) Systems
Instant systems heat water only when needed, rather than storing it in a tank.
Benefits include:
• Continuous hot water supply
• Improved energy efficiency
• Space-saving design
These systems are becoming increasingly popular in modern homes and renovations.
Solar Hot Water Systems
Solar systems use energy from the sun to heat water, making them one of the most energy-efficient options available.
While installation costs are higher, they can significantly reduce long-term energy bills, especially in sunny regions like the Sunshine Coast.
If you’re unsure which system suits your home, a professional plumber can assess your needs and recommend the best option.
Electric vs Gas Systems
One of the most common questions homeowners ask is whether to choose electric or gas.
Electric Systems – Best For:
• Smaller households
• Lower upfront installation costs
• Homes without gas connections
Gas Systems – Best For:
• Larger households
• Faster water heating
• Lower ongoing energy costs
The right choice depends on your usage patterns and whether your property has access to gas.
If you’re currently experiencing issues with your existing system, it’s worth exploring repair or replacement options. Learn more on our Hot Water Systems service page.
System Sizing for Households
Choosing the correct system size is critical. A system that’s too small will run out of hot water, while an oversized system wastes energy.
As a general guide:
• 1–2 people → Small system
• 3–4 people → Medium system
• 5+ people → Large system
Other factors that influence sizing include:
• Number of bathrooms
• Simultaneous water usage (showers, washing machines)
• Peak usage times
A professional plumber can calculate the ideal system size based on your household’s daily water demand.
Energy Efficiency
Energy efficiency is one of the most important considerations when choosing a hot water system.
An efficient system can:
• Reduce energy bills
• Lower environmental impact
• Provide better long-term value
Solar and instant systems are typically the most energy-efficient, while older electric storage systems tend to be less efficient.
Upgrading to a modern system can significantly improve performance and reduce ongoing costs.
Installation Considerations
Before installing a new hot water system, there are several practical factors to consider:
Location
Where the system will be installed affects both efficiency and accessibility. Outdoor installations are common, but indoor systems may be suitable for some homes.
Plumbing Connections
Existing plumbing infrastructure may need to be modified, especially during renovations.
If you’re upgrading your kitchen, bathroom, or laundry, it’s a good idea to coordinate plumbing upgrades at the same time. You can learn more about this on our Renovations Plumbing page.
Budget
Consider both upfront costs and long-term running costs when choosing a system.
Future Needs
Think about future household changes. A growing family may require a larger system in the near future.
When Should You Replace Your Hot Water System?
If your system is showing signs of failure, it may be more cost-effective to replace it rather than repair it.
Common signs include:
• Inconsistent water temperature
• Rusty or discoloured water
• Leaks around the tank
• System age over 10–15 years
In some cases, hot water issues may also be linked to pipe problems. If you suspect this, visit our Burst & Leaking Pipes page for more information.
Get Expert Advice from a Sunshine Coast Plumber
Choosing the right hot water system doesn’t have to be complicated. With the right advice, you can install a system that delivers reliable performance and long-term value.
At Jason Kohl Plumbing, we help Sunshine Coast homeowners select, install, and maintain hot water systems tailored to their needs.
Whether you need repairs, replacement, or a brand-new installation, our team is here to help.
👉 Visit our Hot Water Systems service page to learn more or get in touch today.