High-rise apartments often feature mixed heating zones, where different parts of the building or even a single dwelling rely on separate heating systems. While this approach can improve occupant comfort, it also presents challenges for Energy Performance Certificate (EPC) assessments. Understanding how mixed heating zones affect energy efficiency is key to achieving accurate EPC ratings.

1. What Are Mixed Heating Zones?

Mixed heating zones occur when a property has:

  • Different heating systems (e.g., electric heating in bedrooms, gas boilers in living spaces)

  • Central heating plus secondary heaters (e.g., storage heaters with panel heaters)

  • Shared building-wide systems combined with individual unit controls

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2. EPC Challenges in High-Rise Apartments

High-rise buildings with mixed heating zones complicate EPC calculations because:

  • System efficiency varies across zones, leading to inconsistent performance.

  • Heat distribution losses are higher in communal systems if poorly maintained.

  • Occupant control (thermostats, zoning, timers) directly affects efficiency.

These factors can pull EPC scores down if not optimised.

3. Improving EPC Ratings in Mixed Heating Zone Apartments

To mitigate energy loss and improve ratings:

  • Upgrade to high-efficiency heating systems in all zones

  • Use smart controls and zoning thermostats for consistent management

  • Improve insulation and glazing to reduce reliance on secondary heating

  • Consider low-carbon technologies (such as heat pumps) for central or shared systems

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4. EPC Assessment Considerations

When assessing a high-rise apartment with mixed heating zones, an EPC assessor will:

  • Record the efficiency of each system separately

  • Factor in distribution and control methods

  • Model energy performance using SAP (Standard Assessment Procedure) methodology

  • Provide recommendations tailored to both shared and individual heating setups

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Conclusion

Mixed heating zones in high-rise apartments create unique EPC challenges. Variations in heating system types, efficiency, and controls can lower energy performance if not addressed. By upgrading systems, improving zoning, and working with a qualified EPC assessor, landlords and homeowners can achieve better EPC ratings, reduced running costs, and compliance with regulations.