Electric heating systems have long been a reliable solution for many properties across London. However, when it comes to Energy Performance Certificate (EPC) ratings, these systems—especially if outdated—can significantly lower your property’s score. Even if they are in perfect working order, the EPC framework penalises older electric systems due to energy inefficiency, high operational costs, and limited responsiveness to modern energy-saving upgrades.

In this article, we’ll break down exactly why older electric heating systems hurt your EPC score—and what you can do about it.

1. Efficiency Ratings Are Technology-Based, Not Just Condition-Based

The EPC assessment is based on a standardised methodology that compares your property’s energy use to a benchmark—not just its actual consumption. Modern electric systems such as air-source heat pumps or high-retention storage heaters are far more efficient than older panel heaters or basic night storage units.

Even if your system functions well, it may still fall under a low efficiency category due to its technology generation, not its condition. This translates directly into a lower EPC score, as assessors factor in system type, responsiveness, and thermal control.

2. Older Electric Heaters Lack Zoning and Smart Controls

Outdated electric heaters often lack the ability to regulate heat by zone, time, or usage. Unlike modern systems integrated with smart thermostats or zoned programming, older electric heaters operate in a binary fashion—on or off—without adapting to occupancy or weather conditions.

This lack of control results in:

  • Higher energy consumption

  • Wasted heat

  • Lower scoring under the SAP (Standard Assessment Procedure) model

Learn more about how we assess properties at EPC Assessors London.

3. Higher Running Costs = Lower EPC Ratings

EPC scores factor in estimated running costs over time. Older electric systems are among the most expensive to operate, especially in comparison to gas boilers or renewable systems like heat pumps.

Even with off-peak tariffs:

  • Older night storage heaters are less responsive

  • Manual operation leads to inefficiencies

  • Users often need to supplement heating with additional plug-in heaters

The result? The EPC software assigns a poor energy cost efficiency rating, dragging down your overall score.

4. Electric Heating and Carbon Emissions

Electricity in the UK grid has become cleaner over time, but EPC software still uses carbon factors that rate electricity emissions higher than gas. Older electric systems further compound this problem by converting electricity less efficiently than new technologies like:

  • Electric boilers with modulation

  • Infrared heating panels

  • Heat pumps

Outdated systems = higher carbon footprint = lower environmental impact score on the EPC.

5. What Can You Do to Improve Your Score?

If you’re stuck with older electric heaters, consider these upgrades before your next EPC assessment in London:

  • Replace old night storage heaters with high-retention models

  • Install smart thermostats or programmable timers

  • Add insulation and draught-proofing to reduce heat loss

  • Switch to air-source heat pumps where possible

If you’re not sure where to start, contact us for tailored advice on improving your EPC rating.

Final Thoughts

Even well-maintained electric heating systems can underperform in EPC assessments due to outdated design, poor control, and energy inefficiency. To achieve a better EPC score, it’s important to evaluate not just the working condition of your system, but its technology age, control features, and energy profile.

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