Building-integrated solar thermal (BIST) systems harness solar energy to provide heating and hot water, reducing reliance on conventional fossil fuel-based systems. As sustainability standards tighten, the integration of solar thermal technologies directly impacts a building’s energy efficiency and Energy Performance Certificate (EPC) ratings.

What Are Building-Integrated Solar Thermal Systems?

BIST systems involve incorporating solar thermal collectors into the building envelope—such as roofs, façades, or shading devices—to capture solar heat. This heat is then used for space heating, water heating, or even absorption cooling.

How BIST Affects EPC Ratings

1. Reduced Heating Energy Demand

By supplementing or replacing traditional heating systems, solar thermal reduces the building’s operational energy, a key metric in EPC calculations.

2. Lower Carbon Emissions

Using renewable solar energy lowers the building’s carbon footprint, contributing to improved EPC environmental impact scores.

3. Enhanced Energy Efficiency

Integration of BIST supports compliance with energy conservation requirements, often resulting in better EPC band ratings.

EPC Assessment Considerations for BIST

  • System Efficiency: The performance of solar thermal collectors and their contribution to meeting heating loads.

  • Integration Quality: How well the system is integrated with existing heating and hot water infrastructure.

  • Seasonal Variability: Accounting for fluctuating solar availability throughout the year in energy models.

  • Maintenance and Operation: Ensuring system reliability and consistent performance over time.

Benefits of BIST in Sustainable Building Design

  • Energy Cost Savings: Reduced dependence on external energy sources lowers utility bills.

  • Improved Comfort: Consistent heating supply enhances occupant comfort.

  • Positive Market Appeal: Buildings with renewable energy systems attract eco-conscious tenants and buyers.

Why Choose EPC Rate for Your EPC Assessment?

At EPC Rate, our certified assessors have experience evaluating buildings with advanced renewable technologies like BIST. We provide:

  • Accurate EPC assessments considering solar thermal contributions.

  • Guidance on optimizing building energy performance.

  • Support for compliance with regulations and green certifications.

Book your EPC evaluation via our Booking page, view Pricing, explore our Services – EPC Assessors London, and contact us through Contact Us – EPC Services London.

Conclusion

Building-integrated solar thermal systems significantly enhance energy performance, reducing operational costs and environmental impact. Incorporating these technologies positively influences EPC ratings, supporting sustainable building objectives.