The Most Energy Efficient Boilers

The efficiency of your boiler may not be something you pay much attention to, but is it costing you hundreds of pounds extra each year?

The efficiency of your boiler plays an important role in how well your boiler operates as well as the cost of your fuel bills. The higher the efficiency of your boiler, the lower your fuel costs. The Energy Saving Trust estimates that you could save up to £300 a year by replacing your old inefficient boiler with a new A-rated one.

How efficient is my old boiler?

Some things age well, like wine or cheese. Boilers, however boilers do not! The older your boiler gets, the less reliable and efficient it will become. The average household gas bills are between £750 - £1,000, depending on the size of your property, the age of your boiler and its efficiency.

Most boilers currently operating in the UK are around 80% efficient, due to many of them being oversized and older. Boilers over 25 years old can be as little as 60% efficient, which really racks up the fuel bills.

An energy efficient boiler can help you lower your heating bill considerably, and whilst it may seem like a large upfront cost, the money you save in the long-run is extremely worthwhile. At iHeat we also offer 2 years 0% interest finance deals, preventing such a large upfront cost.

See the table below to work out how efficient your boiler is (approx)

Age of Boiler	Efficiency Percentage	Efficiency Rating
0+ Years	90% +	A
10+ Years	85% +	B/C
15+ Years	80% +	C/D
20+ Years	70% +	E/F
25+ Years	60% +	G

A - 90%+
B - 86-90%
C - 82-86%
D - 78-82%
E - 74 - 78%
F - 70-74%
G - Below 70%

Why should I replace my old boiler?

Although your boiler may still be working after 15 years, it is worth considering replacing your old boiler as the efficiency levels will have decreased, therefore raising your fuel bills and a new A rated energy efficient boiler could save you up to £300 a year according to The Energy Saving Trust. Check out our Top 5 Most Efficient Boilers of 2021 below.

Top 5 Most Efficient Boilers 2021

5. Baxi Duo-tec 33 Combi ErP 28kW

This boiler is known for being straightforward and simple to use and is endorsed by the Energy Saving Trust, so you can be sure it meets the highest standards of energy efficiency with its 88.5% efficiency percentage and B rating. It also provides an impressive 13.5 litre per minute flow rate.

4. Vaillant EcoTec Plus 30kW

This boiler is high performance, control and efficiency. It has precision heating to reduce fuel bills, delivers hot water within 5 seconds and has an impressive hot water flow rate of 15.9 litres per minute and an energy efficiency rating of 90.1%.

3. Alpha E-Tec 28kW

This boiler is a great option for smaller homes and offers an impressive efficiency percentage of 93%. The E-Tec also has a high efficiency pump which helps to deliver an impressive 14.1 litres of hot water per minute and the single electrode drive charge is very easy to access, making it user friendly and easy to control to keep costs down.

2. Worcester Bosch Greenstar 8000 Style 30kW

Worcester Bosch is already a reliable household name that you know you can trust to provide you with a great product. The Greenstar 8000 Style is no different. This boiler offers an amazing efficiency percentage of 94% and up to 14.3 litres of hot water per minute. It’s no wonder that Worcester Bosch has been recommended by Which? For 10 years,

1. Viessmann Vitodens 050-W 29kW

This exceptional boiler definitely comes out on top as the most efficient boiler with a A rating and up to 97% efficiency percentage. This boiler will seriously cut fuel costs whilst being incredibly reliable and offering the highest quality with its new stainless steel heat exchanger, making it extra robust whilst consuming relatively little natural gas. An exceptionally quiet operation means you won’t even notice as it works hard to provide you with heating, instantaneous hot water and an impressive water flow rate of 12 litres/min.

If your boiler is in need of a replacement, take our quick survey here to get a fixed quote on a new boiler. Alternatively, if you'd rather speak to someone over the phone, please don't hesitate to give us a call on 0333 305 6880.