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Sanden Heat Pump


Welcome the Sanden Heat Pump solar hot water system- the most efficient, the quietest, the most environmentally-friendly heat pump solar hot water system on the market.

That’s a big claim, but it’s the truth. Here are a few of the most exciting features of the Sanden Heat Pump…

  • the most efficient. The highest number of STC’s of any heat pump reflects the lowest running cost of any heat pump on the market. That helps save you money.
  • the quietest. An industry-lowest 38dB- not much more than a whisper.
  • the most environmentally-friendly. Uses CO2 as the refrigerant to protect the
    ozone layer, and deliver the lowest carbon footprint of any heat pump. That helps save the environment.

The features don’t stop there… the Sanden Heat Pump…

  • is backed by over 50 years experience in heat pumps.
  • is up to 50% faster heat recovery than typical heat pumps. In ambient air of 20ºC it takes approx 4 hours to heat water from 17ºC to 65ºC
  • is fitted with in-built freeze protection, making it suitable for all climates (-10ºC to +43ºC)
  • has an automatic heating cycle, which makes it perfect for use with off-peak power
  • needs no backup element
  • is simple to instal, with no refrigeration mechanic required
  • boasts a 3 year Warranty on the Heat Pump module

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Here are a few of the most exciting features of the matching Edson Water Tank…

  • High quality,Australian made, extra long life stainless steel cylinder
  • 315 litre Tank with two installation options (tall with a reduced diameter or short with an increased diameter)
  • Fully insulated for minimal heat loss
  • Supplied with all plumbing fittings required to complete the installation including a tempering valve
  • 15 year tank warranty

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The Highest Number Of STCs Of Any Domestic Heat Pump On The Market

ModelTank(litres)Diam. mm.Height mm.Less RECs+
GAUS-315EQTB- Short315690154032
GAUS-315EQTB- Tall315600213532

# Federal Government Rebate for replacing old electric hot water system.
+ Energy Certificates vary in number in different areas. This is for Zone 3. As at September 20th., 2012, their value is approximately $30.

Background Briefing:Sanden Heat Pump Brochure and Specifications
Sanden Heat Pump Owner’s Manual

Schematic Diagram


Sanden Heat Pump
Frequently Asked Questions

1. How does the Sanden CO2 Hot Water Heat Pump (HWHP) work?
A heat pump is a device that uses a small amount of energy to move heat from one location to another. The Sanden CO2 Heat Pump system operates like a refrigerator in reverse. It contains a fan to push air through an evaporator that contains a refrigerant. The heat in the air passes through the evaporator and is absorbed by a natural refrigerant CO2 (R744). The now 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. The now cold refrigerant is then reused, as the cycle recommences.

2. What are the benefits of the Sanden HWHP?
The Sanden CO2 Hot Water Heat Pump System is supplied in two separate modules; Heat Pump Unit and Stainless Steel Storage Tank. This allows easy on-site handling and installation, as well as flexibility of the storage tank location, up to 4 metres distance from the Heat Pump Unit.

(a) The Heat Pump Unit

  • A high Coefficient Of Performance (COP), results in significantly reduced energy use and greenhouse gas emissions. COP is the ratio of the heat output to the energy input
  • Whisper quiet operation, with industry leading noise level of 38 dB
  • Ozone friendly, natural refrigerant  CO2 (R744)
  • Up to 50% faster heat recovery than typical heat pumps. In ambient air of 16 ºC it takes approx 4 hours to heat 315L of water from 17 ºC to 65 ºC
  • The freeze protection control program makes it suitable for all climates (-10 ºC to +43 ºC)
  • A 4 hour heating cycle allows it to make use of lower cost off-peak power (OP1 or OP2)
  • No backup element required, maintaining high efficiency regardless of the weather
  • Simple ground mounted tank and heat pump installation, with no refrigeration mechanic required
  • High quality, weather resistant construction for outdoor installation
  • 3 year Warranty on the Heat Pump module

(b) The Stainless Steel Storage Tank

  • High quality, extra long life duplex stainless steel cylinder.
  • Two x 315 litre Tank sizes to suit your space requirements (tall with a reduced diameter or short with an increased diameter)
  • Fully insulated for extremely low heat loss
  • Safety pressure and temperature relief valve
  • Mains pressure rated
  • Supplied with all plumbing fittings required to complete the installation including a tempering valve

3. I don’t understand the use of a CO2 refrigerant by the Sanden HWHP? Isn’t CO2 a greenhouse gas and therefore harmful to the environment?
Yes, but CO2 has a Global Warming Potential (GWP – see below for explanation) of 1. Carbon dioxide is the baseline measurement of how it will contribute to global warming for a given mass.

Our system utilizes less than 1 kg of CO2 (R-744) as a refrigerant contained in a closed system at the factory.  The installer does not need to charge the heat pump on site.

Global warming potential (GWP) is a measure of how much a given mass of greenhouse gas is estimated to contribute to global warming. It is a relative scale which compares the gas in question to that of the same mass of carbon dioxide (whose GWP is by convention equal to 1). A GWP is calculated over a specific time interval and this time interval must be stated whenever a GWP is quoted or else the value is meaningless.


See also:

4. Why does Sanden HWHP use CO2 as a refrigerant?
R744 offers many unique advantages versus all other refrigerants, as follows:-

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

5. What is the noise level of the Sanden HWHP?
The unit is rated at 38dB, which is almost silent. By comparison, a whisper is around 30dB and inside a library is approximately 40dB.

6. How do I purchase a Sanden HWHP?
The Sanden HWHP is sold by Enviro Friendly. Contact details at the bottom of this page…

7. What is the life expectancy of the Sanden HWHP?
The Sanden HWHP has a design life of 15 years. The high quality, weather resistant construction of the Heat Pump outdoor module, carries a warranty of 3 years, whereas the high quality, extra long life stainless steel storage tank carries a class leading 15 year warranty.

8. At what temperatures will the Sanden HWHP operate effectively?
The Sanden HWHP will operate effectively between minus 10 and plus 43 degrees C. It is fitted with in built freeze protection, making it suitable for all climates.

9. Can I operate the Sanden HWHP on Off-Peak Tariffs?
Yes, please refer to p16 of the Owner’s Manual for details. There are no special settings for off peak connection. Simply ensure that the off peak tariff supplies a minimum of 5 hours continuous power to the Sanden HWHP.

10. What are RECs and STCs and what are they worth?
The purchase and installation of a Sanden HWHP entitles you to Small-scale Technology Certificates (STCs) – formerly known as Renewable Energy Certificates (RECs). For more information:
visit www.climatechange.gov.au and www.rec-registry.gov.au

The Sanden HWHP achieves the highest level of STCs of any Hot Water Heat Pump, currently available in Australia, and these are as below:-

ModelZone 1Zone 2Zone 3Zone 4

11. Is water quality an important consideration for the Sanden HWHP?11. Is water quality an important consideration for the Sanden HWHP?
Yes. Please refer to p11 of the Owner’s Manual for details. Importantly, no warranty applies to the heat pump unit and the storage tank, where the chloride level exceeds 200 mg/litre and the pH is less than 6.0. If in doubt, it is recommended that water chemistry information be sought from your local council or water supplier.

12. What do I do if the Sanden HWHP has a problem?
Firstly, review the Trouble Shooting Guide on p8 of the Installation Manual. If still unresolved, please contact the Dealer/Plumber you purchased your unit from.
If you are unable to reach your dealer, then please call Edson.

13. If there is a power failure, will I need to do anything to the HWHP?
No, the HWHP is fully automatic.

14. If I go away from the house, can I turn the HWHP off?
Yes you can. Turning off will not affect the unit. Just switch the power back on when you get back.