Integrated heat recovery systems (HRS) are becoming increasingly common in modern homes, especially in energy-efficient and airtight buildings. By reusing heat that would otherwise be lost, these systems can significantly reduce energy consumption and improve Energy Performance Certificate (EPC) ratings.

1. What is a Heat Recovery System?

A heat recovery system captures heat from exhaust air or waste water and uses it to pre-warm incoming fresh air or cold water. The two most common types include:

  • Mechanical Ventilation with Heat Recovery (MVHR): Extracts stale air and transfers its heat to fresh incoming air.

  • Wastewater Heat Recovery (WWHR): Captures heat from used shower water to pre-heat cold mains water.

2. EPC Benefits of Heat Recovery

Reduced Heating Demand

By recycling heat, the property’s boiler or heating system works less, directly lowering energy use.

Improved SAP Calculations

Since EPC ratings in the UK are based on Standard Assessment Procedure (SAP) calculations, reduced energy demand translates into a better EPC band.

Lower CO₂ Emissions

More efficient heating reduces carbon emissions, which is a key EPC factor.

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3. Factors That Influence EPC Impact

Not all heat recovery systems have the same effect on EPC outcomes. The impact depends on:

  • Property airtightness: MVHR systems are most effective in airtight, well-insulated homes.

  • System efficiency rating: Higher-rated units contribute more positively to EPC scores.

  • Installation quality: Poorly installed ducting or leaks reduce performance.

  • Occupancy patterns: Properties with higher hot water demand benefit more from WWHR systems.

4. Integration with Other Efficiency Measures

To maximise EPC performance, heat recovery systems should be combined with:

  • High-performance insulation

  • Double or triple glazing

  • Efficient heating systems

  • Renewable technologies such as solar PV

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5. Professional EPC Assessment

An EPC assessor will consider:

  • The type and efficiency of the heat recovery system

  • Its integration with the property’s ventilation and heating

  • Verified manufacturer performance data

This ensures the EPC rating reflects the true efficiency benefits of the system.

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Conclusion

Integrated heat recovery systems can have a significant impact on EPC calculations by reducing heating demand, improving SAP performance, and lowering CO₂ emissions. While results vary depending on system type and installation quality, properties with MVHR or WWHR often see measurable improvements in their EPC ratings.

By combining heat recovery with other efficiency measures and working with a professional EPC assessor, homeowners can maximise energy performance, reduce running costs, and achieve a higher EPC band.