Case Study: Heating a Historic Mill Conversion Without Compromise
Project Type: Heritage building conversion
Building: Former industrial brick mill
Heating System: iHelios electric infrared radiant heating
Emitter Location: Internal walls and ceilings
Objective: Provide modern thermal comfort without altering architectural features
Overview
This project involved retrofitting a historic mill building with a fully electric radiant heating system integrated directly into the structure of the property.
The building features exposed brick masonry, original timber beams, large open-plan areas, and high ceilings. Conventional heating systems would have negatively impacted both efficiency and appearance.
The chosen solution was embedded infrared heating within walls and ceilings heating, transforming the building fabric itself into a radiant heat source.
Why Conventional Heating Was Not Suitable
Traditional heating systems primarily heat air. In high-ceiling heritage buildings this leads to:
- Heat stratification (warm air rising to roof level)
- Slow warm-up times
- Higher energy consumption
- Visual intrusion from radiators and pipework
- Loss of usable wall space
Wet underfloor heating was also unsuitable because it required floor buildup and structural alterations.
Installed Heating Solution
The iHelios system uses low-temperature electric infrared radiant heating film installed behind finished surfaces.
| Heating type | Electric infrared radiant |
| Installation location | Walls and ceilings |
| Emitters | Continuous heating film |
| Pipework | None |
| Boiler / plant room | Not required |
| Visible heaters | None |
| Control | Zoned programmable thermostats |
| Sensors | Open-window detection |
Installation Method
Historic Mill Heating Upgrade. Invisible infrared film iHelios
Heating emitters were installed behind plasterboard linings on selected walls and ceilings.
The building fabric now acts as the radiant emitter, warming people and surfaces directly rather than heating the full air volume.
Thermal Performance Characteristics
Radiant Heating Behaviour
- Directly heats occupants and surfaces
- Minimizes heat accumulation at ceiling level
- Provides faster perceived warmth
- Maintains stable comfort temperature
Benefits in High-Ceiling Buildings
- Reduced stratification
- Lower required air temperature
- Improved floor-level comfort
- Suitable for intermittent occupancy
Control Strategy
Each room operates independently using smart thermostats featuring:
- Weekly scheduling
- Temperature zoning
- Setback modes
- Open window detection
- Rapid response operation
Because heated surfaces store warmth, the building maintains comfort without continuous operation.
Results
Functional Results
- Even comfort across large spaces
- Faster warm-up than wet systems
- No visible heating equipment
Architectural Results
- Preserved exposed brick and beams
- No pipe routes or boxing
- Full wall usability retained
Energy Behaviour
- Reduced heat loss into upper air volume
- Zoned heating reduces wasted energy
- Ready for renewable electricity integration
Conclusion
Embedding radiant heating into the building structure allows historic properties to achieve modern comfort standards without altering their architectural identity.
This approach is particularly suitable for mill conversions, barn conversions, churches, loft spaces and architect-led heritage renovations.
