Completed Project


Architect: Carter Williamson Architects

Builder: Artechne

Location: Birchgrove, Sydney NSW

System: Geothermal Exchange System with Titanium Plate Heat Exchanger

Capacity: 80kW

Project Brief/Scope:

  • High-end residential project
  • Titanium plate heat exchanger using Sydney Harbour for heating and cooling
  • Forced-air cooling via bulkhead fan coil units
  • Hydronic underfloor, pool, spa, and domestic water heating
  • 33% additional capacity for entertainment purposes

What good is having Australia’s largest, most experienced and most diverse team of in-house geothermal exchange engineers if you don’t also have agility?

CWL Group prides itself on tailoring each and every design to not only the particularities of the project – thermal demands, site conditions, and client preferences – but also to the everchanging costs and availability of equipment, material, and labour.

A combination of all of the above led CWL Group to determine that the optimal solution for this client’s ground-source heat pump system was not to use the ground at all. Instead, a built-to-order titanium plate heat exchanger was ordered from the United States and integrated into the structure of the client’s jetty.

Further to never taking a cookie cutter approach with design, CWL Group will also never cut corners with installation. In the past, other contractors have used steel and stainless steel material to affix their titanium plates in the harbour which rust and corrode due to both continuous exposure to the saltwater and galvanic corrosion between titanium and steel. Conversely, every metal component of a CWL Group installation in Sydney Harbour is made of high-grade titanium, right down to the affixing hardware which is imported from a Victorian motorsport company.

While thermal modelling suggested that 60kW of plant would have been enough to maintain the home during standard conditions, the client opted to “supersize” their system to 80kW for additional redundancy, and to ensure there was enough capacity to handle entertaining dozens of guests throughout Sydney’s hottest summer holidays, even as those days become hotter and hotter in the decades to come.


geothermal exchange engineers

geothermal exchange engineers

Our Trusted Partners

We wanted to drop you a line to say thank you for your expertise and professionalism during our geo journey. Your patience and outstanding knowledge were visible along the way and greatly appreciated. Congratulations in assembling a team who have all been of the same high standard. It has been a pleasure to deal with all of you.
- Jenine Cranston and Douglas Fone, Artarmon, Sydney
We engaged CWL for the geothermal exchange and HVAC works on our unique project in Bellevue Hill and were selected based on pricing and their previous experience. It turned out to be the best choice in subcontractors we made for the whole project. Their professionalism, work ethic, expertise and willing to help wherever needed made a highly complex services installation that much easier, and more efficient than expected. I’d like to personally thank James and the site team who put the extra effort in at all times to get our project over the line with remarkable results. Highly recommended Subcontractors and mechanical consultants.
- Theo Elphick, Site Manager, Built
A culture of striving for excellence combined with motivated and dedicated staff is what defines CWL Group. Their workmanship is second to none and it is obvious that all of the staff care about what they do. Commitments are met and exceeded and there are no problems that can’t be resolved. I’m looking forward to working with Clayton and his team in the future and have no hesitation in recommending them to anyone.
- Mick Carroll, Bellevarde Constructions
The team from CWL Group are very reliable, responsive and efficient in their work. They go above and beyond to make sure the job is completed at its highest standard. The knowledge of the guys is exceptional. I would recommend the CWL Group team every time!
- Annemarie Rodrigo, Bellevue Hill House Keeper
I want to thank CWL Group for the outstanding work in installing our hydronic heating system. I have worked with many plumbers over the years and I have never seen such a high standard of workmanship. They came in on time and on budget. I cannot recommend the team from CWL Group highly enough.
- Robert & Roberta Cook, Blue Mountains

Service that goes Above and Beyond... and Below.

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