How Deep Is the Borehole for a Ground Source Heat Pump?
Understanding borehole depth requirements helps you plan for ground source heat pump installation and costs.
Typical Borehole Depths Explained
Vertical borehole systems are the most space-efficient option for ground source heat pumps. The depth required depends on your heating needs and local geology.
Small Home
75-100m
1-2 bedroom properties
Medium Home
100-150m
3-4 bedroom properties
Large Home
150-200m
5+ bedroom or poorly insulated
Factors Affecting Borehole Depth
- Heat demand: Larger or less efficient homes need more heat extraction capacity
- Ground geology: Rock conducts heat better than clay, affecting required depth
- Multiple boreholes: Sometimes 2-3 shallower boreholes are more cost-effective
- Groundwater: The presence of groundwater can improve heat transfer efficiency
Borehole Drilling Process
Professional borehole drilling typically takes 2-3 days per borehole. The process involves:
- Site survey and geological assessment
- Drilling rig setup (requires approximately 6m x 4m access)
- Drilling and casing installation
- Loop pipe insertion
- Grouting and sealing
- Connection to heat pump system
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