Typical Boiler Efficiency Ratings
The amount of energy lost via an inefficient boiler depends on its efficiency rating. Here’s a breakdown to help you understand how this translates in practical terms:
Approx. Efficiency: 60%-75%
Energy Lost: 25%-40%
Let’s say your annual gas usage is 20,000 kWh:
- At 70% efficiency → 6,000 kWh is wasted (30%)
- At 90% efficiency → 2,000 kWh is wasted (10%)
At ~10p per kWh (UK average for gas), that’s £400 wasted annually with a 70% boiler vs. £200 with a 90% efficient one.
Approx. Efficiency: 80%-89%
Energy Lost: 11%-20%
Let’s say your annual gas usage is 20,000 kWh:
- At 70% efficiency → 6,000 kWh is wasted (30%)
- At 90% efficiency → 2,000 kWh is wasted (10%)
At ~10p per kWh (UK average for gas), that’s £400 wasted annually with a 70% boiler vs. £200 with a 90% efficient one.
Approx. Efficiency: 80%-89%
Energy Lost: 11%-20%
Let’s say your annual gas usage is 20,000 kWh:
- At 70% efficiency → 6,000 kWh is wasted (30%)
- At 90% efficiency → 2,000 kWh is wasted (10%)
At ~10p per kWh (UK average for gas), that’s £400 wasted annually with a 70% boiler vs. £200 with a 90% efficient one.
Insulation for Energy Savings
Insulating a home’s walls and loft significantly improves energy efficiency by reducing heat loss. Around 35% of heat escapes through uninsulated walls, and up to 25% through the loft, leading to higher energy bills and increased carbon emissions.
Installing insulation helps maintain a consistent indoor temperature, reducing the demand on heating systems. This not only lowers annual energy costs but also enhances comfort and supports long-term environmental sustainability
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