Geothermal Hydronic Heat Pumps

Geothermal heat pumps offer a great solution for powering your hydronic heating or cooling system for your home. With pipes laid underground, they generate energy from the relatively constant temperature of the earth and use this to heat or cool the water in your hydronic system.
Geothermal heat pump

How Geothermal Heating and Cooling Works?

Geothermal heating and cooling systems tap into the abundant levels of energy stored below the earth’s surface to reduce your heating and cooling costs by as much as 30 percent. Even when it is freezing outside, temperature levels remain steady deep below the ground. With consistent temperatures under ground, geothermal heat pumps generate from one part electricity up to five parts heat. Best of all, geothermal systems can be installed in any sized home or business in virtually any location and are becoming increasingly popular in Australia.
In winter heat is extracted from the ground no matter what the ambient temperature. This is then converted into a higher temperature through a refrigeration system, similar to a standard air conditioner, except the heat is transferred to the water. This hot water can then be used for underfloor heating, radiators, trenches, etc.
In summer, the heat from the property is absorbed into water through an air conditioning unit.  The warm water extracted is then passed through the cooler earth and cool water is then pushed back into the home and your hydronic cooling system.

Benefits of Geothermal Heat Pumps

  • Both energy and cost efficient
  • Much less maintenance required compared to other heating systems.
  • Require very little ventilation compared to air source heat pumps,
  • They have an average lifespan of around 20+ years
  • With the majority of components being underground, the system requires very little maintenance.
  • Provide consistent heating or cooling through heatwaves or freezing conditions.
  • Low environmental impact, with limited carbon emissions
  • They consume 20-50% less energy than conventional heating or cooling systems
  • Can be used for heating and cooling your home

Types Of Geothermal Heating

  • Closed Loop Systems: These can be either vertical, horizontal or pond/lake, with the water being circulated through a closed loop. If you have a large property with a lot of space, then the horizontal system may be the best option for you as you don’t have to dig the trenches as deep. If you have limited space then a vertical system is the preferred option. If your property has a body of water, such as a pond of lake, then the pond/lake system may be the best option.
  • Open Loop Systems:These systems are much less common as they require a large source of ground water. Surface or ground water is circulated through the heat pump and returned after being heated or cooled. A big advantage of this system is that large quantities of water can be transferred, leading to more heat exchange.
Australian Hydronic Heating and Cooling work with suppliers such as Stiebel Eltron and Rinnai, companies which have become synonymous with high quality space heating, water heating and renewable energy products. Below are details of a range of their geothermal hydronic heat pumps which Australian Hydronic Heating and Cooling can source, install and maintain for your property.


Save money while saving energy – the affordable WPF (S) basic series provides an ideal alternative to highly integrated geothermal heat pumps. Featuring top STIEBEL ELTRON quality, the WPF (S) basic is designed for easy installation. Thanks to its compact and timeless design, it fits nicely into your home without wasting valuable space.
  • Geothermal hydronic heat pump installed indoors for underfloor and radiator heating
  • Compact design for easy placement in your home
  • Optimal energy use through efficient circulation pump
  • Timeless design
  • Highest European energy efficiency rating A++ for low energy bills
  • Extremely quiet operation thanks to advanced sound technology
  • Ideal to use in retrofits: up to 65 °C flow temperature
Stiebel internal geothermal hydronic heat pump


In cascading operation, these compact geothermal heat pumps achieve an output of up to 400 kW. To save space in the process, individual heat pumps can be stacked on top of each other. This efficient heating solution was specifically developed for larger residential complexes, as well as commercial and industrial buildings.
  • Geothermal hydronic heat pump installed indoors or outdoors for heating
  • Specially developed for larger residential complexes, as well as commercial and industrial buildings
  • Potential for remote PC monitoring
  • Very quiet operation
  • Flow temperatures up to 75 °C


Rinnai’s Geoflo geothermal heat pump harnesses the free green renewable energy from the earth for cost effective heating and cooling of your home.
The system utilises the stable temperatures found underground, and extracts this as free green energy via state of the art Rinnai technology which reliably delivers highly efficient heating and cooling air conditioning comfort in your home regardless of the outside air temperature.
  • Cost Efficient: can cut electricity consumption by 30% compared to traditional air conditioning system.
  • Quiet Operation: the geothermal system relies on the temperature of the ground to heat and cool your home, with no noisy fans.
  • Space Saving: the hardware requires a lot less space than traditional HVAC systems.
  • New or Retrofit: can be installed in new builds or retrofitted to existing buildings.
  • Easy Maintenance: with few moving parts the system has high durability and reliability.
Rinnai Geothermal Geoflo

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