A steady source gives steady performance
Ground temperature varies little through the year. Performance therefore does not fall on the coldest days, as it does for air-based pumps.
All energy measures
Heating and hot water
Ground-source heat pump
A ground-source heat pump draws heat from a borehole or a collector in the ground. It differs from air-based systems in that the source holds a steady temperature all year.
See what this means for your homeThis measure is relevant if
- The home has waterborne heating, or will get it
- The heat demand is large enough to carry the investment
- The site allows drilling or excavation
- You plan to stay for many years
What it does to energy use
High investment, long life
The borehole is the large cost, and it lasts considerably longer than the pump itself. The sum has to work over many years.
The borehole must be sized
Extract more heat than the ground can replace and the borehole temperature falls over the years, taking performance with it.
Nearly free cooling
Cold fluid from the borehole can provide passive cooling in summer, at far lower consumption than a cooling plant.
Sequence matters
A ground-source pump is sized to the heat demand, so it belongs after everything that changes that demand. It is also the measure where oversizing costs most — the borehole depth cannot be reduced afterwards.
Enova funding
Ground-source heat pumps are among the measures Enova funds, and have been separated from air-to-water in the terms.
Rates and terms change. What you can receive depends on the building, how the work is carried out and which schemes apply at the time. Always check Enova's own pages before relying on a figure.
The rates tell you what you can receive. The calculation tells you what the measure actually does to your home — how much it saves, what it costs, and whether it should come before or after the others.
Which measures pay off in your home?
Enter the address. Gadder collects what is known about the building, calculates the energy demand and ranks the measures by what they actually deliver.