Heat pump vs gas hot water on the Gold Coast

We install all the main types, gas storage, gas continuous-flow, electric storage, heat pump and solar, so this is what we tell customers who ask us straight which one to go with.

Quick definitions

• Gas storage: a tank with a gas burner under it. Heats water and keeps it hot.
• Gas continuous-flow (instant): no tank, gas heats water on demand as it flows through.
• Electric storage: like gas storage but the heating element is electric. Cheapest to install, most expensive to run.
• Heat pump: uses a fan and a small compressor (like a reverse-cycle aircon, but heating water instead of air) to extract heat from outside air. About 3-4x more efficient than electric.
• Solar hot water: roof-mounted panels heat the water directly, usually with a gas or electric booster for cloudy days.

What works on the Gold Coast climate

Three things matter for our climate:

1. Heat pumps love it here. Heat pumps work better the warmer the ambient air is. On the Gold Coast we're rarely below 10°C overnight, even in winter. A heat pump runs at full efficiency virtually year-round. In Tassie they struggle. Up here they don't.

2. Solar has more sun than it knows what to do with. The Gold Coast averages 261 sunny days a year. Solar hot water systems get plenty of hours to do their thing. The downside is the up-front install cost, you're paying for panels, frames, plumbing and a booster system.

3. Gas is fine but the price isn't dropping. Gas as a fuel has been getting steadily more expensive. The appliances are reliable, but the running cost gap vs heat pumps is widening every year.

The maths, running costs (Gold Coast, 2026 prices)

For a 4-person household using about 200L of hot water a day, ballpark annual cost to run:

• Electric storage (old school): $900-1200/year
• Gas continuous flow: $500-700/year
• Gas storage: $550-750/year
• Heat pump: $200-350/year
• Solar (with gas boost): $150-300/year

Those are rough, they depend on usage, tariff, hot water demand profile, and family habits. But the order of operations doesn't change much: solar then heat pump are the cheapest to run, then gas, then electric.

The rebates make heat pumps the obvious winner right now

In 2026, federal STC (Small-scale Technology Certificates) plus the Queensland-specific incentive can knock $1000-$2500 off the upfront cost of a heat pump install. That changes the maths dramatically.

A heat pump that costs $4500 supply and install becomes $2500-$3500 after rebates. A gas continuous-flow install with no rebate is around $2000-$2800. So the gap shrinks to a few hundred dollars upfront, and the heat pump then saves you $300+ per year in running cost.

Payback is typically 2-3 years on the difference. After that, it's pure savings.

When NOT to go heat pump

A few situations where heat pump isn't the right call:

• You've got a tight install spot where the heat pump unit (which is bigger than a gas storage unit and has a fan) can't physically fit, or the noise from the fan would be a problem (e.g. right against a neighbour's bedroom wall).
• Your hot water demand is huge and peaky (large family, all showering in a 30-minute morning window). Heat pump tanks recover slower than gas storage. Sometimes a continuous-flow gas system is a better fit.
• You're already paying for a gas connection for your cooktop, fireplace, etc., and the gas usage is mostly fixed. Hot water gas is a small marginal increase. The maths shifts.
• You need it today and a heat pump install schedules out 1-2 weeks. Sometimes you just need hot water now.

When solar still makes sense

Solar hot water can be the cheapest-to-run option of all, especially if you've already got electric storage and your roof is south-facing. But solar is also the most expensive to install ($4000-$6000 typically), and rebates favour heat pumps right now. We tend to recommend solar only if:

• You're already going through a major roof reno (lower marginal cost),
• Or your usage is very high (5+ people),
• Or you're committed to maximum sustainability and willing to pay extra upfront.

What we'd install in your house

Without seeing it, here's our general advice on the Gold Coast right now:

• Most homes, replacing a dead system: heat pump, take the rebate, save $300+/year.
• Large family with high peak demand: gas continuous flow.
• Already has solar, replacing booster: upgrade the solar tank, keep the gas booster.
• Investment property, lowest install cost matters most: gas storage or continuous flow, whichever connection is easier.

Every situation is a bit different though. Send us a photo of where your current unit lives and your last quarterly water/gas bill, and we'll tell you honestly what'd save you the most.

One thing to watch, the install matters more than the brand

Hot water units are pretty similar across the major brands at the same price point. What kills hot water systems early is bad installs, wrong pressure relief valve, no sacrificial anode replacement schedule, no proper expansion control. We've seen cheap units last 15 years with a proper install, and premium ones fail in 5 with a bad one.

So when comparing quotes, ask the installer:

• Are you replacing the pressure/temperature relief valve?
• Are you replacing the cold water expansion valve?
• Will the warranty be valid (i.e. installed by a licensed plumber, certified)?
• Is the anode replacement covered for the first service?

If they go vague on any of those, it's a flag.

Want us to come and have a look at what'll work in your house? Send a few photos through the contact page or ring us, 0472 657 042.

The real running cost numbers for a Gold Coast 3-4 person household

Using 150-200 litres of hot water per day at 2026 tariffs:

• Heat pump: $200-300 per year
• Gas continuous flow (natural gas): $480-680 per year
• LPG continuous flow (acreage / hinterland): $700-1,000 per year
• Gas storage: $600-900 per year (standing pilot losses)
• Electric storage: $800-1,200 per year
• Solar hot water with electric boost: $100-300 per year (if north-facing roof unshaded)

Over a 10-15 year unit life, heat pump versus gas continuous flow saves $3,000-5,500. Heat pump versus electric storage saves $6,000-10,000.

The install cost comparison after federal STC rebate

• Heat pump (Sanden, Reclaim, iStore) after STC rebate: $3,600-5,800
• Gas continuous flow (Rinnai Infinity 26): $2,200-3,200
• Gas storage like-for-like: $2,000-3,000
• Solar hot water (close-coupled): $4,800-7,500
• Electric storage like-for-like: $1,400-2,200

Heat pump install premium over gas continuous flow is $1,400-2,500, paid back in 2-4 years through running cost savings, then keeps saving for the unit's remaining life.

Coastal vs inland Gold Coast lifespan reality

Salt-air shortens every metal-cased system. Coastal homes (within 1 km of surf) see roughly 25-30% shorter lifespans:

• Gas continuous flow: 12-15 years inland, 9-12 years coastal
• Gas storage: 10-12 years inland, 7-10 years coastal
• Heat pump: 10-15 years inland, 10-13 years coastal
• Solar hot water: 12-20 years either

Coastal homes benefit from mounting the unit on a sheltered south or west wall (not east/north-east). Relocation adds $400-1,200 to the install but adds years to the new unit's life.

PV solar pairing for free hot water

If you have solar PV, heat pump running cost drops further. Set the heat pump to run during peak solar production (mid-morning to early afternoon) and the electricity it uses comes free from your panels. Annual running cost drops from $200-300 to under $50 for most households. We can wire in a timer at install for $80-150.