Heat Pump Without an Outdoor Unit
A silent, invisible heating system designed for homes where appearance and planning matter.
Discover How It WorksSurface Thermal is the solution for homeowners who refuse to compromise on aesthetics. No outdoor units, no noise, no visual intrusion. Particularly suited for listed buildings and conservation areas. For a full comparison of air source, ground source, and Surface Thermal, see our heat pump comparison guide.
Why Compromise Your Home with a Noisy Outdoor Unit?
Visible grey boxes
Traditional air source heat pumps require bulky outdoor units mounted to your home's exterior.
Fan noise disturbance
Outdoor fan noise can disturb neighbours and affect your enjoyment of outdoor spaces.
Planning restrictions
Listed buildings and conservation areas often prohibit visible external heating equipment.
Wasted space
Clearance zones and safety cages take up valuable garden and patio space.
Traditional ASHP
Visible unit + fan noise
Teratherm
Nothing to see or hear
All the Energy Is Captured Beneath Your Feet
Teratherm captures renewable heat through surfaces like driveways and patios. There is no outdoor unit, no fan, and nothing mounted to the building exterior.
How It Works
The heat pump itself is housed internally, while energy is collected invisibly from below the surface. There are no air ducts, fans, or external compressors. Learn more about Surface Thermal technology and how Teratherm captures heat.
- Collectors hidden beneath existing surfaces
- Heat pump unit housed inside your home
- No external equipment visible after installation
Surface Level
No visible equipment
Energy collectors hidden beneath your driveway or patio, completely invisible once installed.
Key Benefits of an Invisible Heat Pump
Zero noise. Happy neighbours.
A genuinely silent heating system with no outdoor fan, no humming, and no vibration. Ideal for terraces, urban homes, and noise-sensitive areas where peace matters.
- No outdoor fan
- No humming or vibration
- Ideal for noise-sensitive areas
Designed for listed buildings and conservation areas
A heat pump for listed building applications and conservation areas. No external alterations required, no visual impact on heritage properties, and often suitable where air source heat pumps are rejected. Perfect for listed building applications.
- No external alterations
- Heritage property compatible
- Planning friendly
Reclaim your space
No clearance zones, no cages or brackets, no garden disruption. Perfect for domestic renewable heating solutions.
- No clearance zones required
- No cages or brackets
- Works with existing surfaces
See the Difference
A visual comparison of heating system approaches
Traditional Air Source Heat Pump
- Bulky external unit required
- Fan noise during operation
- Planning restrictions may apply
Teratherm Surface Thermal
- No outdoor unit required
- Completely silent operation
- Suitable for all property types
Who Is an Invisible Heat Pump For?
This silent heating system is ideal for homeowners who prioritise appearance, tranquillity, and planning compliance.
Invisible Heat Pump FAQs
Not Sure If an Invisible Heat Pump Is Right for Your Home?
Our team can assess your site and explain the best options for your property. No pressure, just honest advice about whether this silent heating system suits your needs. You can also see installed examples or explore ground source heat pump alternatives.