Heat-Pump Hot Water and Solar: How to Cut Your Hot-Water Bills

Quick answer: A heat-pump hot-water system is typically around three to four times more efficient than a conventional electric element, and running it on daytime solar can make your hot water very cheap to produce. Because a heat pump is a flexible daytime load, pairing heat-pump hot water with solar is one of the highest-value electrification upgrades — you heat water with your own energy instead of buying it. Heat-pump hot water is also eligible for federal certificates, some state rebates, and the NSW Home Energy Saver loan, which reduces the upfront cost.

Hot water is one of the biggest energy users in most homes, so it's one of the best places to cut costs. Switching to a heat pump and running it on solar attacks that cost from both sides — using far less energy, and making that energy your own. This guide explains how it works, what it saves, and what support is available.

BESS Australia is an accredited, multi-brand supplier and installer of solar panels and heat-pump hot water systems, supplying Australia-wide and installing across Brisbane, the Sunshine Coast, the Gold Coast, Sydney and Melbourne.

What is a heat-pump hot water system?

A heat-pump hot-water system uses a heat pump to move heat from the surrounding air to heat your water, rather than using an electric element to generate heat directly — which makes it around three to four times more efficient. It works like a reverse-cycle air-conditioner in reverse.

Instead of turning electricity straight into heat (as an old electric-element tank does), a heat pump uses a small amount of electricity to move a larger amount of heat from the air into the water. That efficiency — often expressed as using roughly one unit of electricity to deliver three to four units of heat — is why running costs are so much lower than a conventional electric system.

Can solar run a heat-pump hot water system?

Yes — a heat-pump hot-water system is ideal for running on solar, because its steady, modest electrical draw can be scheduled to run during the day when your panels are generating. Set it to heat during daylight and you're making hot water from your own energy.

This is the key to the savings. Self-consumption — using your own solar rather than exporting it for a low feed-in rate — is exactly what a daytime heat-pump cycle achieves. With a timer set to the middle of the day, the heat pump soaks up surplus generation from your solar panels that would otherwise be exported cheaply, so your hot water costs very little to run. In states with a free midday window (the Solar Sharer Offer or Victoria's Midday Power Saver), you can even run it on free grid power.

Want cheaper hot water? See how a solar-powered heat pump could cut your costs — call 1300 859 066, email sales@bessaustralia.com.au, or request a tailored quote.

Why heat pump and solar are such a good match

Heat-pump hot water and solar pair so well because the heat pump is a flexible daytime load that can be timed to soak up your solar surplus, lifting your self-consumption and cutting your bill. It's one of the easiest loads to shift onto solar.

Unlike lighting or evening cooking, hot-water heating can happen whenever you choose — so it's perfectly suited to the middle of the day when solar is abundant. That makes it one of the most effective ways to use more of your own generation. For homes already weighing up storage, it also complements a battery nicely: the heat pump uses daytime solar directly, while a battery stores the rest for the evening.

Is heat-pump hot water worth it?

For most homes, heat-pump hot water is worth it, because the running-cost savings over an electric or gas system — especially when run on solar — usually outweigh the higher upfront cost, helped by rebates. The exact payback depends on your household and hot-water use.

The table below compares the main hot-water options:

These are indicative comparisons; your actual running costs depend on your household, tariff and how much you run the system on solar. For most families, the combination of lower running costs and available rebates makes the higher upfront price worthwhile over time.

How much can it save?

A heat-pump hot-water system can substantially reduce your hot-water running costs compared with electric or gas, but the exact saving depends on your household size, hot-water use, tariff, and whether you run it on solar. Any figure is an estimate, not a guarantee.

Because hot water is such a large share of household energy, the savings can be meaningful — but they're specific to your home. To understand your own costs, it helps to review your usage and tariff first; the AER's Energy Made Easy tool is a good starting point. From there, a system sized to your household gives a realistic estimate.

Does the NSW loan cover heat-pump hot water?

Yes — heat-pump hot water is an eligible upgrade under the NSW Home Energy Saver loan, which offers eligible NSW households an interest-free loan of up to $15,000 toward energy upgrades. It's one of several supports that can reduce the upfront cost.

The NSW loan is delivered by approved finance providers Brighte and Plenti, is subject to their credit approval, and covers upgrades including heat pumps, solar and batteries. Beyond NSW, heat-pump hot water systems can also be eligible for federal small-scale technology certificates (STCs), which reduce the upfront price, plus additional rebates in some states. Eligibility for any of these depends on the product, the installation and the current rules, so confirm what applies to your situation. The Australian Government's Your Home guidance is a useful reference on efficient hot-water systems.

Pairing with a battery for full electrification

Heat-pump hot water, solar and a battery together form a highly efficient home-energy setup: the heat pump uses daytime solar directly, while a battery stores the rest for the evening. Each part reinforces the others.

If you're electrifying your home in stages, adding a home battery after solar and a heat pump lets you cover your evening usage with stored solar too. A battery is also eligible for the federal Cheaper Home Batteries Program discount, which reduces over time through to 2030 (eligibility depends on the product, install and current rules) — so if storage is on your roadmap, it's worth planning the timing.

Choosing and sizing a heat pump

Choose a heat-pump hot water system sized to your household's hot-water use and suited to your climate, and have it installed by an accredited professional. Sizing and placement affect both performance and running cost.

Tank capacity should match how many people use hot water and when, and in colder regions it's worth choosing a model designed to perform in low temperatures. Placement matters too, since heat pumps draw air and make some noise, so siting is part of a good install. A site assessment sorts these details, so the system suits your home rather than being a generic swap.

How BESS Australia helps

BESS Australia is an accredited supplier and installer of heat-pump hot water, solar and battery systems, offering complete supply-and-install packages as well as equipment-only supply Australia-wide. Because we cover hot water, solar and storage under one roof, we can design a system where each part works with the others — and help you access the rebates and finance you're eligible for.

Our trust signals are straightforward: CEC-approved products, Smart Energy Council membership, the NETCC Approved Seller consumer-protection code, installation by Solar Accreditation Australia-accredited installers, manufacturer warranties, a workmanship warranty, and Australian Consumer Law protections. We also offer a Lowest Price Guarantee, finance options and rebate assistance. Any savings we discuss are estimates that depend on your household, usage and tariff — never guarantees.

Heat your water with your own solar. Ask BESS Australia to quote a heat-pump hot water system paired with solar for your home — call 1300 859 066, email sales@bessaustralia.com.au, or use our request a tailored quote form.

FAQ

Can solar run a heat-pump hot water system? Yes. A heat pump's steady, modest electrical draw can be scheduled to run in the middle of the day when your panels are generating, so you heat water with your own solar instead of exporting it cheaply. This maximises self-consumption and can make hot water very cheap to run. In states with a free midday window, it can run on free grid power.

Is heat-pump hot water worth it? For most homes, yes. A heat pump is around three to four times more efficient than a conventional electric element, so running costs are much lower — especially on solar. The higher upfront cost is offset over time by those savings and by available rebates. Exact payback depends on your household size, hot-water use and tariff.

Does the NSW loan cover heat-pump hot water? Yes. Heat-pump hot water is an eligible upgrade under the NSW Home Energy Saver loan, which offers eligible NSW households an interest-free loan of up to $15,000 for energy upgrades, delivered by approved providers Brighte and Plenti and subject to credit approval. Heat pumps may also be eligible for federal STCs and some state rebates, depending on the current rules.

How much does a heat-pump hot water system cost to run? Running costs are typically much lower than electric or gas hot water because a heat pump is three to four times more efficient, and running it on solar reduces the cost further. The exact figure depends on your household size, hot-water use, tariff and how much you run it on solar, so it's best estimated for your home.