Pool heating on the Gold Coast: gas vs heat pump vs solar (2026 cost guide)

Heating a pool is one of the most common gas jobs we quote on the Gold Coast, and it is also the one where owners are most likely to buy the wrong system for how they actually use the pool. Get it right and you swim from September through to May for a sensible cost. Get it wrong and you either wait two days for the water to come up to temperature, or you open a power or gas bill that ruins the whole idea.

There are three ways to heat a pool here: gas, an electric heat pump, or solar. This guide walks through how each one works, what it costs to buy and to run in 2026, how to size it for your pool, and the coastal-specific things that matter when you live near the water.

The three ways to heat a Gold Coast pool

The short version before the detail:

• Gas pool heater – fastest to heat, works any time of year or day, highest running cost. Best for spas, quick heat-ups, and people who heat on demand rather than all season.
• Heat pump – cheaper to run than gas, slower to heat, leans on the air temperature. Best for holding a pool at a steady temperature across the season in our mild climate.
• Solar – cheapest to run by a long way, but it only works while the sun is on the roof and it heats gradually. Best as a season-extender, often paired with one of the above.

None of them is "best" outright. The right choice comes down to your pool size, how often you swim, and whether you want heat now or heat cheaply.

Gas pool heating

A gas pool heater burns natural gas or LPG to warm water as it passes through the unit, the same on-demand principle as a continuous flow hot water system, just much bigger. Pool water is pumped through a heat exchanger, warmed, and returned to the pool.

The big advantage is speed and control. A correctly sized gas heater will lift a domestic pool a few degrees in a couple of hours and bring a spa to 38 degrees in well under an hour. It does not care whether it is July, overcast, or 9pm. If you want the pool warm for the weekend and it is cold on Thursday, gas is the only option that reliably delivers on that timeline.

The trade-off is running cost. Gas is the most expensive heat per hour of the three, so it suits people who heat on demand, warm it up when you want to swim and switch it off the rest of the time, rather than holding a big pool at temperature all winter.

Sizing matters more than people expect. Gas pool heaters are rated in megajoules (MJ), commonly from around 100 MJ up to 200 MJ and beyond. A plunge pool or spa is happy with a smaller unit, while a full-size family pool needs serious output to heat in a reasonable time. Undersize it and you wait forever; oversize it and you have spent money you did not need to.

Fuel type is the other decision. On natural gas (mains) running costs are lower and you never run out. On LPG (bottles) you have more freedom on where the unit goes, but you pay more per unit of energy and you have to manage bottle swaps or a larger tank. We check your gas supply as part of the quote, because a big pool heater can need an upgraded gas line or meter to feed it enough fuel.

Important: a gas pool heater must be installed and commissioned by a licensed gas fitter. Gas work is licensed work in Queensland for good reason, it is not a DIY or general-handyman job. Our gas fitters handle the heater, the gas line sizing, the connection and the compliance certificate. There is more on our gas fitting page, and a full breakdown of pricing on our gas pool heater install cost page.

Heat pump pool heating

A pool heat pump does not make heat by burning anything. It runs on electricity, but instead of using that power to create heat directly, it uses it to move heat out of the surrounding air and into your pool water, the same way a reverse-cycle air conditioner works, just pointed at the pool. That is why it is so much cheaper to run than gas: for every unit of electricity it draws, it can deliver four to six units of heat.

The advantage is running cost. Over a full season, a heat pump is the cheapest way to keep a pool genuinely warm. Our mild Gold Coast winters suit them perfectly, because heat pumps work best when there is plenty of warmth in the air to harvest, and we have more of that than almost anywhere in the country.

The trade-offs are speed and weather. A heat pump heats gradually, think days to bring a cold pool up, not hours, so it is designed to hold a temperature rather than deliver heat on demand. Its output also drops on cold, still mornings when there is less heat in the air. For most owners that is fine: you set a temperature, leave it on, and the pool stays swimmable. If you want a spa hot in 30 minutes, a heat pump is the wrong tool.

Heat pumps are rated in kilowatts (kW). Sizing to your pool volume and how warm you want it is the difference between a unit that keeps up and one that runs all day and never quite gets there.

Solar pool heating

Solar pool heating pumps your pool water up through black collector mats or tubes on the roof, where the sun warms it, then returns it to the pool. It is the cheapest heat going, because the energy is free; you are only paying to run the pump.

The advantage is running cost, basically nil beyond the pump. On a sunny Gold Coast day it can add several degrees, and it is brilliant for stretching your swim season a month or two on each end.

The trade-off is that it only works when the sun is out. No sun, no heat. Overcast week, cool pool. It also needs enough north-facing roof area, roughly the surface area of the pool itself, to make a real difference. Plenty of Gold Coast owners run solar as the cheap baseline and add a small gas heater for the days the sun does not cooperate.

Which is cheapest to run?

This is where most of the regret comes from, so here is the honest order, cheapest to most expensive to run:

1. Solar – near-free, you only pay for the pump.
2. Heat pump – low running cost thanks to that 4–6x efficiency, the cheapest way to actively hold a temperature.
3. Gas – highest running cost, but unbeatable for speed and on-demand heat.

Real running cost depends on your pool volume, the temperature you are chasing, whether you use a pool blanket (huge, more below), and the season. As a rough guide, heating a full-size family pool on gas for regular use can run into the hundreds of dollars a month, while the same pool on a heat pump is typically a fraction of that. We will give you realistic numbers for your pool when we quote, rather than a one-size figure that will not match your backyard.

What it costs to install (2026 Gold Coast guide)

Every pool is different, so treat these as ballpark ranges for supply and install, not quotes:

• Gas pool heater: roughly $3,500–$6,500+, depending on the MJ rating and how much gas line work is needed to feed it.
• Heat pump: roughly $3,500–$7,000, depending on kW size and electrical work.
• Solar: roughly $3,000–$6,000, depending on collector area and the plumbing run to the roof.

The variable that moves a gas quote most is the gas supply. If your meter and line already have spare capacity, the install is straightforward. If a big heater needs an upgraded line or meter, that adds to it, which is exactly why we look at your gas setup before quoting.

How to size a pool heater

Three things drive sizing:

• Pool volume and surface area. A bigger body of water needs more output, and most heat is lost off the surface.
• The temperature you want, and how fast. Holding 28 degrees all season is a different job to heating from cold to 30 by Saturday.
• Exposure. A shaded, windy pool loses heat faster than a sheltered, sunny one and needs more grunt.

This is why an honest installer asks about your pool and how you use it before recommending a unit. A heater that is too small is the most common complaint we hear from owners who bought online and had a "cheap install" done, it simply cannot keep up.

The upgrade that halves your running cost: a pool blanket

Whatever heating you choose, a pool cover or blanket is the single best thing you can do for running cost. Most of a pool's heat escapes off the surface through evaporation overnight. A blanket can cut heat loss dramatically, meaning your heater works far less to hold the same temperature. On any system it pays for itself, and on gas it is the difference between a sensible bill and a scary one. We always recommend one alongside a heater.

Coastal Gold Coast considerations

Living near the water is great for swimming and hard on equipment. Salt-laden air corrodes outdoor units faster than it does inland, so where the heater sits, how it is mounted, and how it is maintained all matter near the beach. Choose quality equipment rated for coastal conditions, keep it clear of direct salt spray where possible, and rinse and service it regularly. We factor coastal siting into every install, because a unit that is positioned badly will not last the distance down here.

Getting it installed right

Pool heating is not a job to cut corners on, especially gas. A gas pool heater connected by someone unlicensed is illegal, uninsured, and dangerous. Our licensed gas fitters size the unit, run and connect the gas correctly, commission it, and issue the gas compliance certificate so you have the paperwork that says it was done properly. For heat pump and solar we handle the plumbing and coordinate the electrical so the whole job is signed off and warranty-safe.

If you are weighing up pool heating on the Gold Coast, send us your pool size and how you like to use it and we will tell you straight which system makes sense, and what it will realistically cost to run. Ring us on 0472 657 042 or send the details through the contact page.