Heat Pump vs Electric Hot Water: Which Should You Choose? (2026)

The first thing to understand is that a heat pump hot water system is an electric system. It plugs into your electricity supply and produces no on-site combustion. The difference is how it uses that electricity.

A conventional electric storage system uses a resistive element, essentially a large version of the coil in a kettle, to convert electricity directly into heat. Every kilowatt of electricity produces one kilowatt of heat. That is the best a direct-conversion system can do.

A heat pump instead uses electricity to run a compressor that moves heat from the surrounding air into the water. For every kilowatt of electricity it draws, it delivers three to five kilowatts of heat. That is why it uses 60-75% less power for the same amount of hot water. For the full mechanics, see our guide on how heat pumps work.

This is where the two systems diverge sharply. Here is a typical 4-person household comparison.

Assumptions: electricity at about 30c/kWh continuous or roughly 18-22c/kWh off-peak, around 200L daily hot water demand.

An element system on a dedicated off-peak (controlled load) tariff is cheaper to run than one on a standard tariff, but it still uses three to four times the electricity of a heat pump. And with rooftop solar, a heat pump wins outright because it can soak up cheap daytime solar to make hot water, whereas an off-peak element runs overnight when there is no solar to use.

Conventional electric storage is the cheapest hot water system to buy and install, typically $1,500-$2,500 fitted. A heat pump costs more, generally $3,200-$6,500 before rebates, falling to $2,200-$4,500 after them.

The rebates matter here. Because a heat pump is far more efficient, it qualifies for federal Small-scale Technology Certificates (about $400-$1,200 off) and for most state incentive schemes. A plain electric element system generally does not qualify for these, so its sticker price is close to its real price.

Factor the rebates in and the upfront gap narrows to a few hundred dollars up to around $2,000. Given the heat pump then saves $400-$900 every year, the extra is usually recovered within a few years. See our rebates guide for the current figures in your state.

For almost everyone replacing an electric storage system, a heat pump is the better long-term choice. The only scenarios where a plain element system still makes sense are:

• A very tight upfront budget where even the after-rebate heat pump price is out of reach right now.
• A holiday home or rarely-used property where hot water demand (and therefore running-cost savings) is minimal.
• A site with genuinely no room for a heat pump's outdoor unit and airflow clearances.

In every other case, the running-cost saving makes a heat pump the cheaper option over its lifetime, often by many thousands of dollars. If you have or plan to add solar, the case is even stronger, because a heat pump can turn your surplus daytime generation into free hot water.

If you are choosing between a heat pump and gas rather than electric, see our heat pump vs gas comparison.