Heat Pump vs Gas vs Electric: Which Hot Water System Is Right for Your Home?

Your hot water system is one of the most expensive appliances in your home to run. It accounts for roughly 25% of the average Australian household's energy bill. When it fails, or when you're building new, the replacement decision has a real impact on what you pay every quarter for the next 10 to 15 years.

The three main options for Northern Rivers homes are electric storage, gas (storage or continuous flow), and heat pump. Solar is a fourth option but has largely been overtaken by heat pumps in terms of value and simplicity for most residential setups.

Each system has trade-offs. The best choice depends on your household size, energy source, property layout, and budget. Here's how they compare.

Electric Storage Hot Water Systems

An electric storage system heats water using an element inside an insulated tank. It's the simplest and cheapest system to buy and install. Most older homes in Lennox Head, Ballina, and across the Northern Rivers have one.

Purchase and installation cost: Typically $800 to $2,000 installed, depending on tank size (25L to 400L). Replacement is straightforward if the existing connections are in place.

Running cost: The highest of all three options. Electric storage systems draw significant power, especially on continuous tariff. A 250L system for a family of four can cost $800 to $1,200 per year to run, depending on your electricity rate. Controlled load (off-peak) tariffs reduce this, but not all Northern Rivers properties have off-peak metering available.

Lifespan: 8 to 12 years on average. Coastal properties around Lennox Head and Ballina tend to see shorter lifespans due to salt air corrosion on the tank and sacrificial anode.

Best suited for: Budget-conscious replacement where the existing setup is electric, smaller households (1 to 2 people), or properties with off-peak tariff access.

Downsides: Highest operating cost. No government rebates available. Least energy efficient option. Once the stored water runs out, you wait for it to reheat.

Gas Hot Water Systems (Storage and Continuous Flow)

Gas systems come in two formats. Storage systems heat water and hold it in a tank, similar to electric. Continuous flow (also called instantaneous) systems heat water on demand as it passes through the unit. No tank, no stored water, no running out.

Purchase and installation cost: Gas storage runs $1,200 to $2,500 installed. Continuous flow runs $1,500 to $3,500 installed, depending on the unit and whether gas lines need extending.

Running cost: Significantly cheaper than electric. A gas continuous flow system for a four-person household typically costs $400 to $700 per year. Gas storage sits slightly higher due to standby heat loss from the tank.

Important for Northern Rivers: Not all properties have natural gas connected. Many homes in Lennox Head, Alstonville, and rural areas around the Northern Rivers rely on LPG (bottled gas). LPG is more expensive per unit of energy than natural gas, which narrows the cost advantage over electric. Before choosing gas, confirm what supply is available at your property and factor in the ongoing cost of LPG delivery if applicable.

Lifespan: Gas storage lasts 8 to 12 years. Continuous flow units last 15 to 20 years with proper servicing, making them the longest-lasting option.

Best suited for: Larger households that use a lot of hot water simultaneously. Continuous flow is excellent for homes with multiple bathrooms. Properties with natural gas already connected.

Downsides: LPG running costs can be high. Gas storage has standby heat loss. Continuous flow units need adequate gas pressure and flow rate. Installation is more complex than electric, especially if gas lines need to be run.

Heat Pump Hot Water Systems

A heat pump works like a reverse-cycle air conditioner, but instead of heating air, it heats water. It extracts warmth from the surrounding air and uses it to heat water in a storage tank. It runs on electricity but uses roughly one-third the energy of a conventional electric system.

Purchase and installation cost: $3,000 to $5,500 installed before rebates. After applying the available NSW and federal government rebates, the out-of-pocket cost drops significantly, often to $1,500 to $3,000.

Running cost: The lowest of all three. A heat pump for a four-person household typically costs $200 to $400 per year to run. In the Northern Rivers, performance is even better than the national average because heat pumps work most efficiently in warm ambient temperatures. Lennox Head and Ballina's subtropical climate means the compressor works less hard, which reduces energy consumption and extends the unit's lifespan.

NSW and federal rebates (as of 2026): The NSW Energy Savings Scheme and federal Small-scale Renewable Energy Scheme both offer incentives for heat pump installations. Combined, these can reduce the upfront cost by $1,000 to $2,500 depending on the model and your eligibility. JF Plumbing can walk you through what's available and handle the paperwork.

Lifespan: 10 to 15 years. Coastal installations should use units rated for coastal environments to avoid compressor corrosion from salt air.

Best suited for: Most Northern Rivers homes. The subtropical climate is ideal for heat pump efficiency. Households looking to reduce energy bills long-term. Anyone replacing an old electric system. Properties without gas supply.

Downsides: Higher upfront cost (offset by rebates and lower running costs). The outdoor unit has a compressor that produces noise, roughly similar to a split-system air conditioner. This matters for placement, especially in Lennox Head where properties can be close together. Performance drops in very cold temperatures (below 5°C), but the Northern Rivers rarely hits those lows.

Side-by-Side Comparison

Factor	Electric Storage	Gas (Continuous Flow)	Heat Pump
Purchase + install	$800 - $2,000	$1,500 - $3,500	$3,000 - $5,500
After rebates	No rebates	No rebates	$1,500 - $3,000
Annual running cost	$800 - $1,200	$400 - $700	$200 - $400
Lifespan	8 - 12 years	15 - 20 years (cont. flow)	10 - 15 years
Best for	Budget install, small homes	Large households, multi-bathroom	Most homes, long-term savings
Worst for	High energy bills, large homes	Properties without gas	Noise-sensitive placements
Environmental impact	Highest emissions	Moderate	Lowest emissions

Which System Does JF Plumbing Recommend for Northern Rivers Homes?

For most households in the Northern Rivers, a heat pump is the strongest long-term choice. The climate is ideal for it, the rebates bring the upfront cost down, and the running costs are a fraction of electric or LPG gas. Over a 10-year period, the total cost of ownership (purchase plus running costs) is typically the lowest of all three options.

Gas continuous flow is the better option for larger households that need high simultaneous demand (multiple showers and a dishwasher running at once) and already have natural gas connected. JF Plumbing handles all gas supply and installation work across the Northern Rivers.

Electric storage still has a place for straightforward replacements in small homes or units where the budget is tight and the existing infrastructure is electric.

Jesse at JF Plumbing assesses your property, household size, energy supply, and budget before recommending a system. No one-size-fits-all answer. You get advice specific to your situation, a clear quote, and a professional installation that meets Australian standards. Learn more about JF Plumbing's hot water specialist services.

Frequently Asked Questions

What is the cheapest hot water system to run in Australia? Heat pump systems have the lowest running costs. They use roughly one-third the energy of electric storage and cost $200 to $400 per year for an average household. In warm climates like the Northern Rivers, they perform even more efficiently.

Are there government rebates for hot water systems in NSW? Yes. The NSW Energy Savings Scheme and federal Small-scale Renewable Energy Scheme both offer rebates for heat pump installations. Combined, they can reduce the purchase cost by $1,000 to $2,500. JF Plumbing can confirm your eligibility and handle the rebate process.

How long does it take to install a new hot water system? A like-for-like replacement (same type, same location) typically takes 2 to 4 hours. Switching from electric to heat pump may take longer if electrical or plumbing modifications are needed. JF Plumbing provides a clear timeline before the job starts.

Is a heat pump hot water system noisy? A heat pump compressor produces noise comparable to a split-system air conditioner outdoor unit, roughly 40 to 50 decibels. Placement matters. JF Plumbing considers noise, airflow, and proximity to neighbours when recommending installation locations.

Thinking about upgrading your hot water system? JF Plumbing Group supplies and installs all major hot water brands across Lennox Head, Ballina, Byron Bay, and the Northern Rivers. Jesse will help you choose the right system and make sure you get every rebate you're entitled to. View all plumbing services. Call 0412 230 635 or request a free quote.