Why a Gas Boiler with Solar Panels May No Longer Achieve an A3 BER Certificate Rating
- Mihai
- Jun 1
- 3 min read
Updated: Jun 3
If you’re planning an upgrade or a new build, you may be surprised to learn that what once qualified for a strong A3 BER certificate rating in 2010-2014 may now fall short under today’s stricter energy regulations. This is especially true for setups that include a gas boiler and solar thermal panels, which were previously considered a high-performing combination.
So, What Changed for BER certifcates?
Ireland’s Building Energy Rating (BER) system has evolved significantly over the past decade. Since the rollout of Part L 2019 and the latest DEAP software versions, the methodology used to calculate a home's energy performance has become more aligned with low-carbon and all-electric systems. Here's what you need to know:
1. Stricter Carbon and Energy Factors
In 2013, electricity had a higher Primary Energy Factor (PEF), meaning it was penalised in energy calculations. Fossil fuels like gas appeared more efficient. Today, the PEF for electricity has dropped significantly due to the decarbonisation of the national grid. This means electric heating systems (like heat pumps) now perform much better in BER assessments, while gas boilers no longer score as highly.
2. Solar Thermal ≠ Solar PV
While solar thermal still contributes positively to your BER cert, it's no longer as impactful as it once was. In contrast, solar photovoltaic (PV) systems are now favoured, especially when paired with electric heating, heat pumps and smart energy controls.
3. Fabric First: Insulation & Airtightness Matter More
Modern BER assessments put more emphasis on the building fabric—U-values, airtightness, and thermal bridging. Unless your home is extremely well-insulated and tightly sealed, a gas boiler and solar thermal system will not achieve an A3 BER certifcate rating.
4. Mechanical Ventilation & Heat Recovery
Homes using MVHR systems (mechanical ventilation with heat recovery) gain more points under current BER rules, contributing significantly to better indoor air quality and energy efficiency.
What Does This Mean for You?
If your current or planned setup includes a high-efficiency gas boiler and solar thermal, you may no longer reach an A3 rating, even though it may have been sufficient under 2013 rules. For new builds or major renovations aiming for A-rated performance, consider integrating:
Heat pumps
Solar PV (Photovoltaic panels)
Mechanical ventilation
Superior insulation and airtightness
💡 Thinking about switching to a heat pump? You may be eligible for SEAI’s Better Energy Homes (BEH) grant. To learn how the Technical Assessment process works and what documentation is required, check out our guide: Technical Assessment Process for BEH Heat Pump System Grants.
Need Help with Your BER Assessment?
At MTS DNC Energy Consultants Limited, we provide accurate and up-to-date BER assessments based on the latest SEAI standards. Whether you're renovating, building, or just curious about how your current building ranks, we’re here to help.
📞 Contact us today for expert advice and a tailored assessment.
Disclaimer:
The information provided in these posts is for informational purposes only and should not be considered design advice, specifications, or a calculation template. We assume no responsibility or liability for the use of the information presented. For professional advice or design services, please contact us via our contact form.
Comments