Thermal Response Testing Thermal Response Testing
Confirm your closed loop ground source heat pump potential with our precision ground conductivity measurements
Confirm your closed loop ground source heat pump potential with our precision ground conductivity measurements
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What is Thermal Response Testing?
Thermal Response Testing (TRT) is a field test used to measure the thermal conductivity of the ground at depths of up to 200 metres. It provides essential data for the design of closed-loop ground source heat pump systems that use vertical boreholes, particularly on larger or more complex projects.
Why is it Done?
TRT is carried out before installing a ground source system to determine how effectively the ground can absorb or release heat. This ensures boreholes are correctly sized and the system operates efficiently over its lifetime.
Rather than relying on generic ground assumptions, TRT gives accurate, site-specific data—reducing the risk of system underperformance or over-engineering.
How it Works:
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A purpose-built TRT rig is connected to a test borehole.
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Heated water is circulated continuously through the borehole loop over 2–3 days.
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During this time, temperature and flow data is recorded on site by our trained technician.
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The data is then analysed by our technician, who calculates the average thermal conductivity and borehole thermal resistance.
Key Benefits of TRT:
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✅ Accurate borehole design – avoids unnecessary drilling or under sizing
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✅ Improved system efficiency and performance
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✅ Reduced long-term energy costs
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✅ Lower installation risks
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✅ Compliance with best practices for larger schemes
When is Thermal Response Testing Needed?
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For larger residential, commercial, or district heating projects
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Where boreholes are deep (typically up to 200m)
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When ground conditions are unknown or variable
At Geowarmth, we manage the entire TRT process —from drilling to setup and data collection to expert geological analysis—ensuring reliable design and long-term performance for your ground source heat pump system.
Contact Us
If you’re unsure what’s right for your home or commercial space, provide some details here and we can get in touch to talk to you about your property
Contact Us
If you’re unsure what’s right for your home or commercial space, provide some details here and we can get in touch to talk to you about your property