Older heating systems like night storage heaters and outdated boilers were once popular for their simplicity and off-peak electricity savings. However, in today’s energy-conscious property market, these systems pose significant challenges when it comes to Energy Performance Certificates (EPCs). Their inefficiencies can heavily impact a property’s EPC rating, affecting both its marketability and compliance with minimum energy standards.
What Are Night Storage Heaters & Obsolete Heating Systems?
Night Storage Heaters (NSH): Electric heaters that store heat during off-peak (cheaper) night-time hours and release it during the day.
Obsolete Heating Systems: Includes old, inefficient electric heaters, back boilers, non-condensing gas boilers, and solid fuel systems with outdated technology.
These systems are still common in older flats, rural homes, and properties without gas connections.
Why These Systems Hurt Your EPC Rating
1. Low Energy Efficiency Ratings in SAP Calculations
EPC assessments in the UK use Standard Assessment Procedure (SAP) or RdSAP models. These models assign very low efficiency scores to storage heaters and outdated systems, as they:
Have high standing losses (they lose stored heat before it’s needed)
Rely heavily on electricity, which is scored poorly in SAP unless from renewable sources
Lack modern controls (zonal heating, thermostats, smart timers)
2. Poor Environmental Impact Rating
Night storage heaters and old systems often result in high calculated CO2 emissions per square metre, further dragging down EPC scores, even if actual energy bills seem manageable due to off-peak tariffs.
3. Ineligibility for Minimum EPC Standards
Properties with F or G EPC ratings due to inefficient heating systems cannot be rented out legally in the UK without improvements or valid exemptions.
Learn more about how EPC assessments work on our About Us page.
EPC Recommendations Typically Suggested
An EPC report for properties using night storage heaters or obsolete heating systems often recommends:
Replacing with high heat retention storage heaters
Switching to electric panel heaters with smart controls
Installing air-source heat pumps
Improving insulation to reduce overall heating demand
These upgrades can significantly raise EPC ratings from F/G to C/D, depending on the property.
Should You Replace Night Storage Heaters Before an EPC Assessment?
If you’re selling or renting:
Yes, upgrading before an EPC can drastically improve marketability and compliance.
If selling as-is:Consider getting an EPC assessment done and providing upgrade recommendations to buyers.
Our Residential EPC Services can guide you through the best approach for your property.
How Urgent EPC Can Help
At Urgent EPC, we assist property owners in:
Accurately assessing properties with outdated heating systems.
Providing upgrade advice to improve EPC ratings.
Issuing Same-Day EPC Certificates when urgent documentation is required.
Offering transparent Pricing Plans with no hidden charges.
Providing step-by-step support via our Contact Us page.
Conclusion
Night storage heaters and obsolete heating systems are major culprits for poor EPC ratings. With evolving energy regulations and rising buyer/tenant expectations, it’s essential to understand their impact and plan accordingly. Upgrading heating systems not only improves energy performance but also enhances property value and compliance.
At Urgent EPC, we offer professional guidance on how to boost your EPC rating, including heating system evaluations. If you’re planning to install a heat pump or want to reassess your current EPC, we can help you get fast, certified results.
Call Us Today: +447741 812864
Email: info@urgentepc.co.uk
