The efficiency of your boiler plays a key role in determining your energy bills and overall environmental impact. For homeowners, understanding their boiler’s efficiency can highlight whether it’s time for an upgrade to a more energy-efficient model, such as a condensing boiler. In this guide, we’ll explore how to determine the efficiency rating of your boiler and what it means for your home’s energy use.
What Is Boiler Efficiency?
Boiler efficiency refers to how well your boiler converts fuel into usable heat. A more efficient boiler will waste less energy, reducing your household’s carbon footprint and lowering energy costs. Efficiency ratings are measured in percentages—the higher the percentage, the more efficient the boiler.
Types of Boilers and Their Efficiency Ratings

Boilers are classified into different categories, with condensing boilers being among the most efficient. Here’s a breakdown of the most common types:
1. Non-Condensing Boilers
Non-condensing boilers are older models that waste a significant amount of energy through the flue. Typically, these boilers have efficiency ratings between 70-80%, meaning 20-30% of the energy produced is lost during operation.
2. Condensing Boilers
Condensing boilers are far more efficient, often achieving ratings of 90% or higher. They achieve this by capturing and reusing heat from the flue gases that would otherwise be wasted. If your current boiler is non-condensing, upgrading to a condensing boiler could reduce your energy bills and make your home more eco-friendly.
How to Find Your Boiler’s Efficiency Rating
If you’re unsure of your boiler’s efficiency rating, there are a few ways to find out:
Use Online Tools
You can check the efficiency rating of your boiler online by using tools Simply input your boiler’s make and model, and the tool will provide you with its efficiency rating.
Consult a Heating Engineer
If you can’t find the information online or on the boiler itself, a heating engineer can inspect your system and give you an estimate of its efficiency.
What Can You Do If Your Boiler Is Inefficient?
If you discover that your boiler isn’t operating efficiently, you have a few options:
- Upgrade to a Condensing Boiler: If you currently have a non-condensing boiler, upgrading to a condensing model can significantly improve your home’s energy efficiency.
- Schedule a Service: Regular maintenance, such as cleaning the boiler’s components and checking for leaks, can help your current boiler operate more efficiently.
- Consider Smart Heating Controls: Installing smart thermostats and heating controls can help optimise your system’s efficiency by only heating your home when necessary.
Improving Boiler Efficiency with Kentish Plumbers
Knowing your boiler’s efficiency rating can help you make informed decisions about whether to upgrade or maintain your current system. At Kentish Plumbers, we offer tailored advice and boiler installation services to ensure your home is as energy-efficient as possible. Contact us today to find out more about improving your boiler’s performance.
