If you’re choosing a new hot water system in Perth right now, you’ve got more options than ever — and more conflicting advice than ever to go with them. Gas is being phased out in some states. Heat pumps are being heavily promoted. Electric storage is what most people have but few people want to keep. Solar systems are ageing out across the suburbs.
This guide cuts through it. No brand recommendations, no agenda — just a straightforward comparison of the main system types for Perth homeowners in 2026, written by a licensed plumber who installs all of them.
The four main options for Perth homes
Before comparing them, it’s worth understanding what each system actually does.
Electric storage heats water using an element inside a tank and keeps it hot until you need it. It’s simple, widely available, and inexpensive to purchase and install. The downside is running cost — it’s the most expensive system to operate, and Perth’s hard water accelerates element and tank deterioration if the system isn’t serviced regularly.
Gas storage works the same way as electric storage but uses natural gas to heat the water. Faster recovery time, lower running costs than electric, and familiar to most Perth households. Requires a natural gas connection — not all properties have one.
Gas instantaneous, also called continuous flow, heats water on demand rather than storing it. No tank, no standby heat loss, endless hot water. Well suited to renovated homes and larger households. Higher upfront cost than storage options but lower running costs over time. Also requires a gas connection and adequate gas pressure at the property.
Heat pump systems extract heat from the surrounding air and use it to heat water — working similarly to a reverse-cycle air conditioner but for your hot water. They use electricity but far less of it than a conventional electric element. Australian energy data consistently shows heat pump systems deliver 60–70% savings on hot water running costs compared to standard electric storage systems. They are the fastest-growing category in residential hot water across Perth and increasingly the default recommendation for homes not on gas.
How they compare head to head
Running cost is where the difference becomes stark. Electric storage is the most expensive to run, typically costing Perth households significantly more annually than any of the alternatives. Gas storage and gas instantaneous are cheaper to run than electric, with instantaneous having the edge due to no standby losses. Heat pump is the cheapest to run of the four — the 60–70% saving over electric storage is a meaningful figure for a system that runs every day.
Upfront cost runs in roughly the opposite direction. Electric storage is the cheapest to purchase and install. Gas storage and gas instantaneous sit in the mid-range, with instantaneous typically higher due to installation complexity. Heat pump has the highest upfront cost of the four, though government rebates via the federal Small-scale Technology Certificates scheme currently reduce the purchase price by around $860 for a standard 200L system, depending on your location zone.
Lifespan varies by system type and, critically in Perth, by how well the system is maintained. Perth’s water hardness — typically ranging from 121–180 mg/L, classified as hard to very hard — accelerates scale buildup on heating elements and inside tanks. Research from local plumbing specialists indicates this can increase energy consumption by 15–30% and potentially halve the lifespan of an unserviced water heater. Regular servicing matters for all storage systems, regardless of the heat source.
Suitability depends on your property. If you’re not on natural gas and connecting isn’t cost-effective, gas options are off the table. Heat pump systems need adequate space and work most efficiently in areas with reasonable ambient temperatures — Perth’s climate suits them well year-round. Electric storage remains the simplest fallback but is increasingly hard to justify on running cost grounds alone.
The solar question
Many Fremantle and inner Perth homes have older rooftop solar hot water systems — the kind with a storage tank mounted on the roof. These systems were a good option when they were installed, but a significant number are now underperforming or approaching end of life, often without the homeowner realising. The tell-tale sign is an unexpectedly high electricity or gas bill, caused by the boost element or gas booster quietly carrying most of the load while the solar collectors contribute little.
If you have one of these systems and it’s more than 12–15 years old, it’s worth having it properly assessed before you assume it’s still doing its job. In most cases, retiring it and replacing with a heat pump or gas instantaneous unit delivers better performance, lower running costs, and significantly less maintenance complexity.
What about rebates in 2026?
Heat pump systems are currently the only residential hot water option that attracts a federal government incentive through the Small-scale Technology Certificates scheme. The STC value is deducted directly from your purchase price by the installer — you don’t claim it separately. In 2025–2026, a standard 200L heat pump installation is attracting around $860 in STC value depending on your zone. The number of STCs allocated per installation decreases each year as the scheme winds down, so the rebate available today is higher than it will be in future years.
There are no equivalent federal incentives for gas or electric storage systems in WA at the time of writing.
So which one should you choose?
The honest answer is that it depends on your property, your household, and your priorities. But here is a straightforward way to think about it.
If you’re on natural gas and replacing an existing gas system, staying on gas — storage or instantaneous — is a reasonable, cost-effective choice. Instantaneous is worth the additional upfront cost if your household uses a lot of hot water or you’re renovating anyway.
If you’re not on natural gas, a heat pump is the strongest all-round recommendation for most Perth households in 2026. The running cost savings are real, the rebate reduces the upfront gap, and Perth’s climate is well suited to heat pump operation year-round.
If upfront cost is the overriding constraint and your property is on gas, gas storage is a practical, lower-cost option that will serve you well with regular servicing.
Electric storage is rarely the best choice for a new installation in 2026 unless specific circumstances make the alternatives impractical. The running cost gap is too significant over a system’s lifespan to ignore.
A note on Perth’s water and why servicing matters for any system
Whichever system you choose, regular servicing is not optional in Perth. The mineral content in Perth’s water supply — among the highest of any Australian capital — accelerates deterioration in all storage systems. Anode rod replacement every three to five years, regular flushing of sediment, and periodic element checks are the difference between a system that reaches its expected lifespan and one that fails years early.
This is true regardless of which type of system you choose. Build it into the plan from day one.
Taro Flow Plumbing supplies and installs all major hot water system types across Fremantle and surrounding suburbs. If you’re not sure which system is right for your property, call Matt directly on 08 6234 8714 for an honest assessment — no sales pitch, no brand loyalty, just the right recommendation for your home.
