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.

Going deeper: we have written full standalone guides on the two systems people agonise over most, our heat pump pool heating deep-dive (how they work, real running cost, sizing, coastal units) and our solar pool heating guide (collectors, roof aspect, what it really delivers). For pricing specifically, see heat pump pool heater cost, gas pool heater install cost, and the head-to-head on heat pump vs gas running cost. Or answer three quick questions in our pool heating selector tool and get an honest recommendation for your exact situation.

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, and domestic units typically draw 200 to 500 MJ per hour. That is a serious gas appliance, often drawing more than every other appliance in the house combined, which is why the gas supply itself decides half the installation cost. 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.

What Reddit gets right about pool heating (and what it misses)

Plenty of people research pool heating by reading Reddit threads before they ring anyone, and honestly, the crowd gets a fair bit right. The advice you will see repeated in almost every thread, "get a pool blanket before you spend anything else", is spot on, it is the single best dollar-for-dollar move in pool heating. The scepticism about solar in winter is fair too: solar is a season-extender, not a July guarantee, and threads are full of people who found that out after being oversold.

Where the threads usually go wrong is on sizing and running cost. Reddit answers tend to quote someone else's power bill without knowing their pool volume, target temperature or wind exposure, and those variables change the number several-fold. The other common miss is heat-up speed: a heat pump sized to hold temperature all season gets called "useless" by someone who expected it to heat a cold pool overnight, which was never its job. And nobody on a forum can check your gas line size or switchboard capacity, which is often the thing that actually decides which system your house can take without extra cost. Read the threads for the lived experience, then get the sizing and the infrastructure checked against your actual pool before you spend.

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.

Installing a gas pool heater: what the gas fitter actually does

Most pool heating guides are written by pool shops, and they stop at the point where the heater arrives on a pallet. As a licensed gas fitter, my work starts there, and it is the part that decides whether the heater performs and whether the installation is legal.

Gas line sizing is the make-or-break step. A gas pool heater typically draws 200 to 500 MJ per hour. For comparison, a large cooktop draws around 50 MJ and a continuous flow hot water unit around 200 MJ. Bolting a pool heater onto a house means the gas line, the meter and the regulator all have to deliver that load on top of everything already connected, at full flow, without the pressure dropping at the far end of the run. That comes down to pipe diameter, run length, the number of bends and the total connected load, and it has to be calculated, not guessed. An undersized line starves the burner, the heater short cycles or derates, and the pool never reaches temperature. Owners then blame the heater when the real problem is a gas line that was never sized for it.

Sometimes the existing gas supply cannot support a pool heater, and you should know that before you buy one. Common situations on the Gold Coast:

• The existing meter is a standard domestic unit that cannot pass the extra load, and the network operator needs to upgrade it
• The house line is a long, small-diameter run that would need replacing or a new dedicated line run to the pool plant area
• The home is on LPG bottles that cannot sustain a 400 MJ draw for hours, so the bottle setup or the fuel choice needs a rethink
• The total connected load with the pool heater added exceeds what the regulator can supply

None of these are dealbreakers, but each one changes the quote. This is exactly why gas installation prices span $3,500 to $6,500 or more, and why I check the gas supply before quoting rather than surprising you on install day.

Compliance is not optional. In Queensland, connecting a gas pool heater is licensed gas work. On completion you receive a compliance certificate for the installation, which matters for your insurance and when you sell the property. The commissioning includes pressure testing the line, checking operating pressure at the appliance under full load, and verifying flueing and clearances around the heater. If someone offers to connect a gas heater without paperwork, walk away.

Heat pump installation: the plumbing side nobody mentions

A heat pump does not need a gas fitter, but it does need proper hydraulic and placement work, and this is where online purchases go wrong.

Hydraulic connection. The heat pump tees into the pool's filtration circuit, usually after the filter and before any chlorinator. The plumbing needs a bypass arrangement so water flow through the heater can be balanced and the unit can be isolated for service without shutting down filtration. Flow rate matters: too little flow and the unit trips out, too much and heat transfer suffers. Valve placement and correctly solvent-welded PVC in the right pressure class are small details that decide whether the system runs quietly for years or leaks at the fittings.

Plant positioning. Heat pumps pull heat from the air, so they need free airflow and somewhere to discharge cold air without recirculating it. Jammed into a fence corner or under a deck, the unit breathes its own cold exhaust and efficiency falls off a cliff. On coastal blocks, position the unit out of direct salt spray and on a proper base, and keep the noise side away from bedroom windows, yours and the neighbours'. Ten minutes of thought at installation saves years of complaints.

Honest buyer guidance from someone who does not sell heaters

I am not a pool shop and I do not carry a brand I need to move. So here is the plain version:

• If you want the pool warm on demand year round, or you have a spa, gas is the only method that genuinely delivers it. Budget for the gas supply work, not just the heater.
• If you swim regularly through the season and want low bills, a heat pump is the sensible default for Gold Coast conditions.
• If you mainly want to stretch the swimming season and have north-facing roof space, solar is the cheapest to run by a long way.
• Whatever you choose, buy the blanket. It is the best dollar-for-dollar upgrade in pool heating.
• Before buying a gas heater online, have the gas supply assessed. The heater is the cheap part of a gas installation; the supply is the variable.

If you are weighing up gas for the pool alongside other gas work, our gas fitting services page covers what a licensed gas fitter handles, from new appliance connections to compliance certificates. And if your gas hot water system is due for attention at the same time as the pool project, it can pay to size the gas line for both jobs at once. See our hot water systems page.

Thinking about a gas or heat pump pool heater? Call Jieye on 0472 657 042 for an honest assessment of your gas supply and a fixed written quote. QBCC plumbing licence 15243081.