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  • Benefits include:

    You can save up to 80% of your  hot water energy costs when compared with a traditional electric hot water system!  The Sanden Eco® Plus Hot Water Heat Pump uses only 20% of the energy required by older-style, electric element  hot water storage systems.

    Not only does a Sanden Eco® Plus heat pump hot water system help save on energy costs, it also delivers:

    (a) Heat Pump Unit Benefits:

    • Innovative technology; up to 50% faster heat recovery than currently available Hot Water Heat Pumps.
    • Industry leading quality & performance; the Sanden Eco Plus gives you the highest level of STC credits of any currently available heat pump hot water system.
    • Class leading warranties; backed by Sanden’s 35 years of operation in Australia.


    (b)  Stainless Steel Storage Tank Benefits:

    • High quality; extra long life duplex stainless steel cylinder.
    • Fully insulated; for extremely low heat loss.
    • Safety, pressure and temperature relief valves.
    • Mains pressure rated.

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  • The Sanden Eco Plus hot heat pump hot water system is available in the following five sizes with our sizing guide below:

    Tank size/shape Tank Code System No. of People No. of Bathrooms Dwelling type Off-peak & Continuous tariffs? Tank Diameter (mm) Tank Height (mm)
    160L SS SAN-160SAQA GAUS-160FQTS 1 1 Bedsits Continuous only 621 970
    250L SS SAN-250SAQA GAUS-250FQTS 1-3 1-2 Residential Both 621 1428
    300L Tall SS SAN-300SAQA GAUS-300FQTS 2-6 1-3 Residential Both 580 1891
    315L SS SAN-315SAQA GAUS-315FQTS 2-6 1-3 Residential Both 621 1748
    315L VE SAN-315VE GAUS-315FQTV 2-6 1-3 Residential Both 638 1626

    The same Sanden Heat Pump condenser unit is used in combination with different tanks sizes. So which tank size you would like?

    When considering tank sizes - we need to consider a few factors - number of people, number of bathrooms, the heat recovery rate.

    If you're using an existing hot water system for comparison - here are some comments/thoughts:

    If you have an existing gas storage hot water system (e.g. 130L / 170L) - these are much smaller in capacity but they will reheat several times a day. Therefore the Sanden tank size will be larger than an existing gas storage replacement with the Sanden re-heat typically only required once per day - a good opportunity to maximise rooftop solar PV production or to utilise an off peak tariff.

    If you have an existing electric storage hot water system (e.g. 400L 3.6kW unit) - these electric storage 3.6kW units recover heat at a slower rate (60L/hr) compared to a Sanden heat pump (approx. 80L/hr). Therefore a 400L electric storage hot water system would equate to a 300L/315L Sanden system in this example.

    Based on our years providing the Sanden Eco heat pump hot water system - here are our tank recommendations for different scenarios (SS - Stainless Steel // VE - Vitreous Enamel):

    160L SS: Only recommended for 1 person bedsits. This tank size is rarely chosen and due to its small tank size must be run in Continuous only mode (no blockout timer can be set up).

    250L SS: Typically 1-3 person household with 1 bathroom. Height just under 1.5m with tank diameter 621mm.

    300L SS: The Tall Slim - the most popular and best recommended tank choice. Recommended for 2-6 people. Tank diameter 580mm and tank height just under 1.9m. If no height restrictions apply, this is the recommended tank for majority of situations and considered best value for money across the tank sizes.

    315L SS: The largest tank size with an additional 15L delivered hot water (5% more) compared to the 300L Tall Slim tank. Tank diameter 621mm with tank height 1.74m - this is recommended if the 300L tall slim tank is too tall for your application.

    315L VE: Tank diameter 638mm with tank height 1.63m with 315L delivered hot water. This VE tank is specified for poor water quality areas - you can identify if you are in a poor water quality area via the Sanden website ->

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  • The Sanden Eco® Plus heat pump hot water (HPHW) system operates like a refrigerator in reverse. It contains a fan that forces air through an evaporator that contains a refrigerant. The heat in the ambient air passes through the evaporator (note: even air below 0 º C contains heat energy) and is absorbed by a natural refrigerant, R744 (aka CO2), which is ozone friendly and does not significantly contribute to global warming compared with most other refrigerants (older style refrigerants have thousands of times more global warming impact for the same amount of gas, when compared with CO2).

    The warm gaseous refrigerant is circulated in the system via a compressor. As it passes through the compressor, its pressure rises, as does its temperature. This hot refrigerant then passes through a heat exchanger to heat the water, which is finally pumped to the storage tank.

    How a Sanden Eco Plus Heat Pump Hot Water services works


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  • Why does the Sanden use CO2 as its working gas, what is the benefit?

    • There is far less environmental impact (i.e. No ozone layer depletion and minimal global warming) than other commonly used refrigerants, should the system leak. 
    • There is a much higher efficiency, thereby allowing more heat to be transferred to the water, for less energy used (i.e. Excellent  thermodynamic ability).

    Isn't CO2 a greenhouse gas and therefor bad for the environment?

    While it is true that Carbon Dioxide (CO2) is a greenhouse gas it has a Global Warming Potential (GWP) of 1. Whereas refrigerant gases in other heat pumps can have GWP of over 10,000, which means if they leak to the atmosphere they contribute 10,000 times more to global warming compared with the refrigerant gases used in a Sanden Eco Plus. 

    The table below shows the GWP for some common refrigerant gases (note: GWP must include a time interval over which the greenhouse gases act, in this case 100 years)

    How Sanden delivers better Performance and Savings


    Our system utilizes less than 1 kg of R744 (CO2) as a refrigerant contained in a closed system at the factory.  The installer does not need to charge the heat pump on site.

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  • Uploading Photos for Sanden Eco Heat Pump Quote

    As heat pump hot water systems receive Government subsidies and rebates, Government authorities are requiring all photos are GEO-tagged to comply.

    If you are unsure that your photos are GEO-tagged, we have a helpful Geo-tag guide on our website here ->

    You can test if your photos are GEO-tagged by uploading photos to this website ->

    Please see below some photo tip examples for uploading photos to your Sanden Eco heat pump quote request.

    Existing Hot Water System (Left)

    Photo Tips: 2-3m to the left of the tank and up to the eaves

    A picture containing building, house

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    Existing Hot Water System (Right)

    Photo Tips: 2-3m to the right of the tank and up to the eaves



    Existing Hot Water System (Serial Number)

    Photo Tips: Clear and readable


    Photo Tips: Clear and readable so if you zoom in you can see the circuit breaker rating, enclosure flaps are open