Choosing the right hot water system is one of the most important decisions you’ll make for your home. It affects your daily comfort, energy bills, and environmental footprint for years to come. With so many options available, it can be difficult to know where to start.
In this guide, we’ll break down the key differences between gas and electric hot water systems, helping you understand which option suits your household’s needs, budget, and lifestyle.
Understanding Your Hot Water Options
Before diving into the comparison, it’s worth understanding the two main types of systems available for both gas and electric:
Storage systems heat water and store it in an insulated tank, ready for use whenever you need it. These are the traditional systems most Australian homes are familiar with.
Instantaneous (continuous flow) systems heat water on demand as it passes through the unit. There’s no storage tank, so you’re not paying to keep water hot when you’re not using it.
Both gas and electric options come in storage and instantaneous varieties, each with their own advantages.
Gas Hot Water Systems
Gas hot water systems remain a popular choice for Australian households, and for good reason. They offer reliable performance and can be more economical to run than electric systems, depending on your energy tariffs.
How They Work
Gas storage systems use a burner to heat water in an insulated tank. The thermostat maintains the water at a set temperature, and the burner reignites whenever the temperature drops. Gas instantaneous systems heat water directly as it flows through a heat exchanger, providing endless hot water on demand.
Advantages of Gas
- Lower running costs – Natural gas is generally cheaper than electricity per unit of energy, which can translate to lower bills
- Faster heating – Gas heats water more quickly than standard electric elements
- Works during blackouts – Gas storage systems with a pilot light continue working when the power goes out
- Unlimited hot water – Instantaneous gas systems provide continuous hot water, ideal for larger households
Considerations
- Upfront cost – Gas systems typically cost more to purchase and install than basic electric systems
- Gas connection required – You’ll need an existing gas line or be prepared to have one installed
- Ventilation needs – Gas systems require proper ventilation and must be installed outdoors or with appropriate fluing
- Maintenance – Regular servicing by a licensed gas fitter is essential for safety and efficiency
If your gas hot water system is showing signs of trouble, our gas hot water system repairs service can help diagnose and fix the issue before it becomes a major problem.
Electric Hot Water Systems
Electric hot water systems are the most common type found in Australian homes. They’re straightforward to install and don’t require a gas connection, making them suitable for almost any property.
How They Work
Electric storage systems use one or two heating elements inside the tank to heat water, similar to a kettle. The thermostat controls when the elements switch on to maintain the desired temperature. Electric instantaneous systems use high-powered elements to heat water as it flows through the unit.
Advantages of Electric
- Lower upfront cost – Electric storage systems are generally cheaper to purchase and install
- No gas connection needed – Ideal for homes without access to natural gas
- Flexible installation – Can be installed indoors or outdoors, in more locations than gas systems
- Off-peak tariffs – Many electricity providers offer cheaper off-peak rates, allowing you to heat water overnight at reduced cost
- Solar compatibility – Electric systems can be paired with solar panels to reduce running costs significantly
Considerations
- Higher running costs – Standard electric tariffs are typically more expensive than gas
- Slower recovery – Electric elements take longer to reheat a tank of water than gas burners
- Blackout vulnerability – Electric systems won’t work during power outages
- Tank size matters – You’ll need to choose the right size tank to avoid running out of hot water during peak usage
For issues with your existing system, our electric hot water repairs team can get your hot water flowing again quickly.
Comparing Running Costs
Running costs are often the deciding factor for homeowners. While gas is generally cheaper per unit of energy, the total cost depends on several factors:
Gas running costs depend on: – Your gas tariff (natural gas is cheaper than LPG) – System efficiency rating – How much hot water your household uses – Whether you have a storage or instantaneous system
Electric running costs depend on: – Your electricity tariff (off-peak vs peak rates) – System efficiency rating – Tank size and insulation quality – Whether you have solar panels
As a general guide, a gas instantaneous system typically offers the lowest running costs for medium to large households. For smaller households or those with solar panels, an electric system on off-peak tariffs can be very economical.
Which System Suits Your Household?
Choose gas if: – You have an existing gas connection or can easily get one installed – Your household uses a lot of hot water (large family, multiple bathrooms) – You want continuous hot water without worrying about tank size – You prefer lower ongoing running costs over lower upfront costs – You want hot water available during power outages
Choose electric if: – You don’t have access to natural gas – Your household is smaller with moderate hot water needs – You have solar panels or plan to install them – You can take advantage of off-peak electricity tariffs – You prefer a lower upfront cost and simpler installation
What About Heat Pumps and Solar?
While this guide focuses on traditional gas and electric systems, it’s worth mentioning that heat pump hot water systems are becoming increasingly popular. These use electricity but operate more like a refrigerator in reverse, extracting heat from the air to warm water. They’re highly efficient but have a higher upfront cost.
Solar hot water systems use roof-mounted panels to heat water directly or preheat water before it enters a gas or electric booster. They offer excellent long-term savings but require suitable roof space and orientation.
If you’re interested in these alternatives, we can discuss the options during a consultation.
Signs It’s Time to Replace Your Hot Water System
Not sure whether to repair or replace your current system? Here are some signs that replacement might be the better investment:
- Age – Most hot water systems last between 8 and 15 years. If yours is approaching this age, replacement is often more cost-effective than major repairs
- Rusty water – Discoloured water from your hot taps can indicate internal tank corrosion
- Inconsistent temperature – If your water temperature fluctuates unexpectedly, the thermostat or heating elements may be failing
- Strange noises – Rumbling, popping, or banging sounds often indicate sediment buildup or component failure
- Visible leaks – Any pooling water around your system needs immediate attention
- Rising energy bills – An inefficient system works harder and costs more to run
Professional Installation Matters
Whichever system you choose, professional installation is essential. Incorrect installation can void warranties, reduce efficiency, create safety hazards, and even breach Australian standards.
At Vitality Plumbing, our licensed plumbers and gas fitters ensure your new hot water system is installed correctly, safely, and in compliance with all regulations. We’ll also help you choose the right size and type for your household’s specific needs.
Ready to Upgrade Your Hot Water System?
Whether you’re replacing an old system or installing hot water in a new home, Vitality Plumbing can help you find the perfect solution for your needs and budget.
We service Lake Macquarie and surrounding areas including Boolaroo, Speers Point, and Warners Bay. As licensed plumbers and registered gas fitters, we can install, repair, and service both gas and electric hot water systems.
Contact us today for a free, no-obligation quote. We’ll assess your property, discuss your options, and recommend the best system for your household.