Is a heat pump hot water system worth it? The honest answer (and how to dodge a lemon).

Here's the part the ads skip: a heat pump doesn't make heat, it moves it — pulling warmth from the air to heat your water. That's why it uses roughly two to three times less electricity than an old electric-resistance tank to do the same job. For most homes, that efficiency plus the rebates makes it a clear win. But there are specific households where the honest advice is to wait, choose more carefully, or plan the whole electrification instead of a one-appliance swap.

A heat pump usually suits your home if:

• You're replacing an old electric-element tank — the running-cost drop is immediate and large.
• You have (or plan to add) solar, so the heat pump can run on cheap daytime power.
• You're going all-electric anyway and want to shed the fixed daily gas charge for good.

A heat pump is a weaker (or negative) case if:

• You're on cheap mains gas in a mild climate and keeping other gas appliances — you still pay the gas supply charge either way.
• You're in a genuinely cold zone (Canberra, Hobart) and a cheap, underspecced unit is being pushed on you.
• Your roof is heavily shaded, or you rent and can't influence the install.

If you're in the first group, a heat pump almost always pays. If you're in the second, the honest move is to slow down and get the details right — which is exactly what we'll help you do. See how it fits the bigger picture on our electrification page, or get your own numbers run in a free assessment.

Victoria's Victorian Energy Upgrades (VEU) program sets a mandatory minimum customer contribution for hot-water upgrades. In plain terms: a compliant hot water system cannot legally be supplied and installed at zero cost. So when you see "free heat pump" or "$33 heat pump" splashed across an ad, it's not a bargain — it's a marketing hook that's either non-compliant with the program or quietly propping up the price somewhere you can't see, usually with a cheap unit and a rushed install.

What is true is that the real out-of-pocket cost can be genuinely low. Once the VEU discount stacks with the Solar Victoria hot-water rebate, a straightforward job can land at as little as ~$200 to $500 after rebates — a great deal, but not "free". Two honest points that cut against the usual sales pressure:

• A legitimate Victorian quote shows a licensed-electrician line item. The VEU rebate for a heat-pump hot water install requires the electrical work to be done by a licensed electrician — so that line item is real, not padding. If it's missing from your quote, that's a classic cowboy tell.
• We won't quote a fixed dollar figure here. Rebate values and your exact site drive the price, so any headline "$X" you see online is an estimate that drifts. The honest way to compare is a real quote for your home.

Want to see what you'd actually qualify for? Start with the rebate checker, read the fuller breakdown on our rebates & incentives page, or get it costed for your home in a free assessment.

The reason a heat pump is cheap to run is efficiency, measured as a COP (coefficient of performance). A conventional electric element sits at a COP of about 1 — one unit of power in, one unit of heat out. A heat pump can deliver several units of heat per unit of power, which is where the two-to-three-times running-cost saving comes from.

Two honest cautions on the headline numbers:

• The COP falls on cold mornings. The impressive efficiency figures on a brochure are measured in warm air. As the outside temperature drops, the unit works harder and uses more power — so your winter running cost is higher than the summer figure.
• Solar timing is the biggest lever. Run the heat pump in the middle of the day on your own solar and a large share of your hot water is effectively free. Run it on peak grid power on a cold night and it costs meaningfully more. A good install lets you set it to heat when power is cheapest.

Because the real cost swings on climate, tariff and solar, we won't publish a single "$X per year" figure — it would mislead more than it helps. The honest way to know your number is to have your usage and bill modelled for your home.

This is the source of most heat-pump horror stories. A heat pump's efficiency drops as the air outside gets colder, so on a frosty morning it works harder and draws more power than the warm-weather brochure figure suggests. In mild and temperate parts of Australia, most quality units handle winter fine. The trouble starts when a cheap, underspecced unit is installed in a genuinely cold climate — it leans on its built-in electric booster all winter, and your "efficient" hot water quietly runs up a resistance-heater bill.

In truly cold zones such as Canberra and Hobart, look for a unit rated to run on the heat pump alone down into sub-zero temperatures — a CO2 (R744) or otherwise cold-rated model — rather than one that falls back on its element every cold night. And be sceptical of headline efficiency claims: a COP figure around 5 is a warm-ambient laboratory number. Real cold-day performance for a CO2 unit is closer to a COP of roughly 2.1 to 2.6 — still far better than an element tank, but nowhere near the brochure.

The honest rule: in a warm or mild climate, most good units are fine. In a cold climate, insist on a cold-rated unit and treat any single quoted COP as a best-case, warm-weather figure until you've checked the temperature it was measured at. You can see the units we fit on our electrification page.

Moving hot water (and eventually heating and cooking) from gas to efficient electric does add some load to your electricity bill. But a heat pump is efficient enough that the increase is modest — and against it you get to delete the fixed daily gas supply charge entirely. In Victoria that charge is roughly $255 to $365 a year before you've used a single unit of gas. Removing it is often what tips the total bill lower, even as the electricity side ticks up.

Two honest caveats that matter more than any headline saving:

• The supply-charge saving only lands when gas is FULLY disconnected. Keep even one gas appliance — a cooktop, a heater — and you still pay the whole daily supply charge. So the "going all-electric saves you money" story is only true once the last gas appliance is gone.
• Some homes need an electrical upgrade. Adding electric hot water (and later an induction cooktop) can need switchboard or circuit work. Whether you need it, and what it costs, is scenario-dependent — get it quoted rather than assuming a flat price.

Because the net saving is highly household-specific, treat any figure as a range and get your own bill modelled — with and without solar — before you commit. Our electrification guide walks through how the pieces fit together.

There are two ways to get off gas, and they cost very differently:

• Disconnect (or cap at the meter) — a temporary disconnection is far cheaper and, for most households, all you actually need. Once you're genuinely off gas, it stops the fixed daily supply charge.
• Abolish — physically removing the gas service from the property. This costs more, though in Victoria the charge to the disconnecting customer is capped at roughly $220 as things stand. It's worth doing if you're certain you'll never want gas again.

The key point is timing: the supply-charge saving only kicks in once you're off gas across every appliance, so plan to remove the last gas appliance at the same time as the hot water. Whether disconnect or abolish is right for you depends on your network and your future plans, so confirm the exact process and cost with your gas distributor before you book anything. We'll flag it in your assessment so it isn't a surprise line item later.