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Top 5 Hot Water Heat Pumps

Why Choose a Hot Water Heat Pump?

Here are our Top 5 Hot Water heat Pumps, Hot Water heat pumps are becoming very popular among households, with the rising costs of energy hot water heat pumps can save family’s hundreds of dollars on energy bills. Hot water heat pumps reduce your household emissions by converting the heat from the air to heat your water. A big benefit is a heat pump doesn’t use the sun to convert its energy into hot water, they even work at night. Some heat pumps even have options to run at night to take advantage of off peak energy tariffs. Local governments are offering rebates and financial incentives for hot water heat pumps, reducing the family’s up front cost’s. After all that, hot water heat pumps are very easy to install and can be easily fitted in place of your current hot water unit.

How do Hot Water Heat Pumps work?

Hot water heat pumps work in different way to your standard electric and gas hot water units. The heat pump is very similar to your refrigerator or split cycle reverse air unit.

The air around the heat pump is absorbed by the refrigerant; this is then circulated into a compressor. The compressor compresses the warm refrigerant, which causes it to heat up even further. The hot gas then passes through a heat exchanger, which transfers the heat to the water. The refrigerant is cycled back into the system and the hot water is pumped into the storage tank.

The Top 5 Hot Water Heat Pumps

1. Reclaim Co2 Hot water Heat Pump

Key Features

  • Glass lined enamel or stainless steel tanks
  • Top down heatpump for improved hot water recovery 110L/hr
  • Environmentally friendly Co2 refrigerant – R744
  • Extremely quiet operation of 37db
  • Smart controller designed to used excess PV generation
  • Average daily consumption of 3kWh energy for 315L hot water delivery
  • Up to 6 years warranty on the heatpump and 15 years warranty on the tank
  • COP at 32.6c ambient / 21.1c cold water inlet – 6.02
  • Heat output 32.6c ambient / 21.1c Cold water inlet 5.24KW
  • Electric input at 32.6c ambient / 21.1c cold water inlet 0.87KW
  • Operates down to -10c

In a study the reclaim Co2 hot water heat pump replaced a 315L electric hot water tank, it was found to reduce the energy consumption for hot water delivery by 80%. Before the heat pump was installed the kilowatt usage was on average 14-20kWh a day, now after the heat pump installation the kilowatt usage has dropped to 2-4kWh/day, reducing the electricity consumption by 80%.

Reclaim Heat Pump
Reclaim Hot Water Heat Pump

The Reclaim Co2 hot water heat pump is a split system design, with a separate stand-alone compressor and tank. The tanks have two options glass lined and stainless steel. The main difference between the two is the glass lined has an enamel coating, which is suitable for all types of water, whereas the stainless steel is designed for anything that is non-high mineral or non-bore water applications. The systems heat exchanger collects the heat from the air surrounding the unit, to heat up a pressurised refrigerant, which is an ozone friendly Co2. The unit can supply in excess of five units of heat energy from ambient air for every unit of electricity it consumes, minimising the cost of the of energy used to produce hot water. The reclaim Co2 hot water heat pump has excellent cold weather performance characteristics, meaning there is no need for a boosting element to supplement the heating of the unit.

2. Stiebel Eltron WWK 302/302H – Hot Water Heat pump

Key Features

Stiebel Eltron Hot Water Heat Pump
Stiebel Eltron Hot Water Heat Pump
  • German Engineered
  • Suitable for hard and soft water area’s
  • Operates down to minus -5c
  • Quiet operation with encased compressor – 45db
  • Refrigerant R134a
  • Seasonal COP of 3.94
  • Power consumption of 0.55kw at 31 ambient temperature
  • Single piece design for ease installation
  • H models contain a smart element to aid hot water recovery

The Stiebel Eltron WWK is a combined design, with an encased compressor on top of the tank for quiet operation. The heat pump is German engineered for Australian conditions. The tank is designed for hard and soft water areas with a maintenance free current impressed anode. The Stiebel Eltron can operate done to minus 5c, which makes it ideal for cold climates; it also has an active defrost function, which maintains operation in cold climates automatically. It looks great with a single piece design for ease of installation.

3. Rinnai Enviroflo Hot Water Heat Pump V2

Key features

  • Australian designed and manufactured
  • Available in 250L or 315L versions
  • 1000kpa maximum water pressure rating
  • Quiet operation of 48db
  • Can operation in temperature conditions of -1c to -45c (the element will operate beyond these limits)
  • Heat pump heating capcity of 5.2kw @ 32.6c Ambient 21.1c cold water inlet
  • Enviromentally friendly refrigerant R290
  • COP of 7.22 @ 32.6c Ambient 21.1 Cold water inlet
  • Innovative controller to maximize hot water availability while using more then 70% less energy
  • 7 Years warranty on the cylinder
  • 3 Years warranty on the refrigeration components
Rinnai Enviroflo Hot Water Heat Pump V2
Rinnai Enviroflo Hot Water Heat Pump V2

The Rinnai Enviroflo Hot Water Heat Pump is a combined integrated system that is designed and manufactured in Australia. They are available is a range of capacity and sizes, and can be equipped with magnesium or hard water anodes to further customize their capabilities to suit the application. A standard feature of the Rinnai Enviroflo is the single element boost, that allows the product to be used in high demand applications or even cold ambient conditions, meaning you will enjoy hot water all year round. The Rinnai is built locally to outlast the tough Australian conditions, these tanks have been designed and tested to operate with water pressures up to 1000kpa.

4. Sanden Eco Plus 315 litre Hot Water Heat Pump

Key features

Sanden Eco Plus Hot Water Heat Pump
Sanden Eco Plus Hot Water Heat Pump
  • Environmentally friendly R744 refrigerant
  • 96 COP @ 32.45c ambient / 18.74c Cold water inlet
  • Designed to operate in all climates ( -10c to +43c)
  • 6 Year Warranty on the Sanden Eco Plus heat pump unit
  • 15 Years warranty on the stainless steel storage tank
  • Quiet operation of 37db
  • High Quaility Japanese made and weather resistant
  • Heat output of 4.99KW @ 32.45c ambient / 18.74c Cold water inlet
  • Electric input of 0.84kw @ 32.4c ambient / 18.74c Cold water inlet
  • Storage tank available in multiple sizes

The Sanden Eco® Plus Hot Water Heat Pump System works in a different way compared to a conventional electric hot water system – it operates like a refrigerator in reverse.

The Sanden Eco® Plus uses a small amount of energy to move heat from one location to another. Heat is absorbed by ozone-friendly R744 (CO2), a natural refrigerant that does not contribute to global warming.


As the warm gaseous refrigerant circulates through the system, it passes through the compressor and its pressure and temperature rises. The hot refrigerant then passes through a heat exchanger, which heats the water. The refrigerant is cycled back into the system, and hot water is pumped to the storage tank.

5. Chromagen Midea 280 Litre Hot Water Heat Pump

Key features

  • Modern and slim design
  • Non ozone depleting R134a refrigerant
  • Heat pump output of 2KW
  • 1kw of power input to produce 4kw of heat
  • 170L and 280L models available
  • Quiet operation of 49db
  • Operates as low as 5c in eco mode and between -20c & 45c with additional E-heat boost
  • 5 Year cylinder tank warranty
  • 3 Year compressor warranty
Chromagen Midea 280 Litre Hot Water Heat Pump

The Midea hot water heat pump is a combined integrated system with a slim and modern design. The top mounted compressor harvests the free energy from the air to heat your water. This renewable energy water heating technology uses up to 65% less energy compared to a conventional electrical water heater. The Midea hot water heat pump comes in 2 different tank sizes to suit any modern family application.

Our Verdict on the Top 5 Hot Water Heat Pumps

We love them all! Anything that can save our family’s money and reduce our carbon footprint is a must have for us. Although the initial cost up front is more than your standard electric water heater, the heat pumps cheaper running cost’s will save you money many times over.

If we had to choose, here are the main points we would look out for, decide what best suits your situation and what you hope to achieve from the heat pump.


Noise level

Heat output vs electrical input

Type of refrigerant

Operating temperatures

(as some are more suited to cooler climates like Victoria or hotter climates in Queensland)

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