Your hot water system has a real talent for comedy timing. It never fails on a mild afternoon when you have nowhere to be; it waits for the coldest morning of the year, mid-shampoo, with a queue forming outside the bathroom door. And once it gives up, you are suddenly making a decision most of us never plan for: electric, gas or solar?
It is a bigger call than it first looks. Water heating is one of the largest energy costs in the average Australian home, often second only to heating and cooling, so the system you choose quietly shapes your power bills for the next decade or more.
The goal of this guide is simple: to break down the pros, cons, costs and installation considerations of each option in plain, everyday language. For Coffs Coast homes there is an extra factor too, as salt air and coastal humidity can affect how well a system holds up over the years. If you are planning a hot water system installation, here is what you need to know before you commit.
Quick answer: Gas usually offers the best balance of upfront and running cost, electric is the cheapest to install but the most expensive to run, and solar costs the most upfront but the least to run while qualifying for the Small-Scale Technology Certificates (STCs) rebate. The right choice comes down to your household size, hot water usage, roof space and budget.
At a Glance: Electric vs Gas vs Solar
| System | Upfront cost | Running cost | Efficiency | Best suited to |
|---|---|---|---|---|
| Electric | Lowest | Highest | Lowest | Units and smaller households |
| Gas | Moderate | Moderate | Good | Larger, high-usage homes |
| Solar | Highest | Lowest | Best | Sunny homes focused on long-term savings |
Use this as a quick guide, then read on for the detail behind each option.
Electric Hot Water Systems: Pros, Cons and Best For
Why Homeowners Choose Electric Systems
They have a lower upfront cost, are easy to install, and suit smaller households well.
Things to Consider Before Installing
Running costs are higher, they are sensitive to every electricity price rise, and once a tankful is gone you are often waiting for it to reheat, which is no fun when there is still a queue for the shower.
Best suited to units, smaller families and budget-conscious households.
Gas Hot Water Systems: Pros, Cons and Best For
Key Benefits of Gas Hot Water Systems
Fast heating, good energy efficiency and reliable performance for larger households.
What to Keep in Mind
You need natural gas access or LPG, and the installation cost can be slightly higher.
Best suited for homes with high hot water usage.
Solar Hot Water Systems: Pros, Cons and Best For
Why Solar Is Gaining Popularity
Running costs are very low, it is the most sustainable option, and here on the Coffs Coast we have exactly what solar loves most: sunshine, and lots of it. With our generous run of clear, sunny days, a well-placed solar system spends much of the year heating your water essentially for free. The Small-Scale Technology Certificates (STCs) rebate can also help offset the upfront price. As a Registered Green Plumber, Emerald Beach Plumbing can also assist with the STC rebate claim on eligible solar and heat pump systems.
Challenges to Know
The upfront cost is higher, performance depends on sunlight, and most systems need an electric or gas booster for cloudy stretches.
Best suited for homes with good sun exposure and a long-term savings focus.
Cost Comparison: Which System Is More Affordable?
Upfront Installation Costs
Electric is usually the cheapest to install, gas sits in the middle, and solar is the most expensive at the outset. What you actually pay depends on the system type and size, the brand you choose, whether you go for a storage tank or a continuous flow unit, and any new gas, electrical or roof work needed to get it connected. A solar or heat pump system can also have part of that upfront cost offset by Small-Scale Technology Certificates (STCs). Because every home is different, Emerald Beach Plumbing works out the right system as part of a free, no-obligation on-site quote, so you get an accurate price for your place rather than a rough guess.
Running Costs Over Time
This is where the order flips. Solar is cheapest to run, gas is moderate, and electric is generally the most expensive long-term.
What impacts cost over time comes down to household size, water usage habits, climate and energy rates. As a rule of thumb, a hot water system installation isn’t just about the price tag, it’s about how much it will cost you over the next 10 years.
Which Hot Water System Is the Most Energy Efficient?
If you rank them, electric is the least efficient, gas is more efficient, and solar is the most sustainable. Efficiency matters because it shows up directly on your bills, month after month, for the life of the system.
It is also worth asking about heat pump hot water systems, which pull warmth from the surrounding air to heat your water very efficiently. Like solar, eligible heat pump systems can qualify for Small-Scale Technology Certificates (STCs), and the team at Emerald Beach Plumbing can talk you through whether one suits your home and help with the rebate claim.
Which Hot Water System Is Best for Your Home?
Small households: an electric system is often the simplest, most affordable fit.
Medium to large households: gas usually delivers the best balance of speed and running cost.
Homes wanting lower bills long-term: solar is hard to beat once installed.
Homes with limited roof space: gas or electric will likely make more sense than solar.
Professional Tips Before Installing a Hot Water System
Check your existing plumbing and energy setup, compare your water usage during peak times, and consider local energy prices before you decide. On the coast it also pays to choose a unit and position that can stand up to salt air, which speeds up corrosion on exposed systems. Keep in mind that any gas hot water system must be installed by a licensed gasfitter, while solar and electric units should be fitted by a licensed hot water installer.
Emerald Beach Plumbing installs and services all the major brands, including Rinnai (as an Official Rinnai Service Agent), Dux, Bosch, Vulcan and Apricus solar, so you are never locked into a single option. The right professional guidance often pays for itself.
What to Expect From a Hot Water System Installation
Replacing a hot water system is usually a straightforward job when a licensed plumber handles it. Here is how it works with Emerald Beach Plumbing:
- Enquiry and booking: Get in touch by phone or through the online enquiry form, and we will arrange a time that suits you.
- On-site assessment and free quote: A plumber checks your existing setup, talks through your options, and provides a free, no-obligation quote.
- Installation: Once you approve the quote, our licensed team installs your new system using quality parts.
- Completion and sign-off: We make sure everything is running safely, then leave you with simple advice on getting the most out of your new system.
Frequently Asked Questions
Which hot water system is the cheapest to run?
Solar is the cheapest to run over time, followed by gas, with electric generally the most expensive to run long-term.
How long does a hot water system last?
As a rough guide, electric systems last around 10 to 15 years, gas systems around 8 to 12 years, and solar systems around 15 to 20 years with good maintenance.
Do I need gas connected to install a gas hot water system?
Yes. You will need natural gas or LPG available, and the system must be installed by a licensed gasfitter, as it is a Type A gas appliance.
Are there rebates for solar hot water in NSW?
Yes. Eligible solar and heat pump systems can qualify for Small-Scale Technology Certificates (STCs), and Emerald Beach Plumbing can help you with the claim.
What size hot water system do I need?
It depends on your household size and hot water habits. A free on-site consultation is the easiest way to get the right size and type for your home.
How much does it cost to install a hot water system?
The cost depends on the system type and size, the brand, and any gas, electrical or roof work needed to connect it. Electric is usually the cheapest to install and solar the most, while eligible solar and heat pump systems can be offset by Small-Scale Technology Certificates (STCs). Emerald Beach Plumbing provides a free, no-obligation on-site quote so you know the exact price for your home.
Which hot water system is best for a coastal home?
On the Coffs Coast, salt air speeds up corrosion, so the unit you choose and where it is positioned matter as much as the system type. Gas and electric suit many coastal homes, while solar works well where there is good sun and roof space. A licensed local plumber can recommend and position a system built to handle the coastal climate.
Need Help Choosing the Right Hot Water System?
Every home is different, and the best system for your neighbour may not be the best for you. If you are already leaning towards solar, you may also like our guide on the benefits of solar versus traditional hot water systems for Coffs Harbour homes. And if you would like a straight answer tailored to your household, the team at Emerald Beach Plumbing offers a free, no-obligation on-site consultation across the Coffs Coast, helping you choose, install and (for solar) claim your STC rebate on the right system for your needs and budget. As a licensed (Licence 361847C), fully insured and WorkCover accredited team and a member of the Master Plumbers Association NSW, Emerald Beach Plumbing installs and services hot water systems from Coffs Harbour to Sawtell, Woolgoolga and across the Mid North Coast.
Ready to talk it through? Call Emerald Beach Plumbing on (02) 6650 0544 for a free, no-obligation chat, or submit an online enquiry through our contact form. We service the Coffs Coast and Mid North Coast, with 24/7 emergency support available.
