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Energy Efficient Boilers


If you are concerned with saving money on your monthly utilities, there are a few changes homeowners can make to economise. If you are hoping to save up to 40% on your energy bill, opting for a new, A-rated combi boiler may be one of the better long-term options. This article will cover some basic information on becoming energy efficient, alongside facts in regard to boilers, as well as various, highly rated units on the market.

Improving Your Home’s Energy Efficiency

While it may seem easy to tell someone that they can decrease their home’s overall energy consumption by simply replacing their ageing boiler, it isn’t always that easy. There are a variety of ways to make improvements, if a new boiler isn’t an immediate option for you budget. New solar panels, new or additional attic or loft insulation, upgrading to double glazing heating, and new condensing boilers are a few long term solutions. Short term solutions include:

  • Energy Efficient Blackout Curtains
  • New Installation of a Programmable Thermostat
  • Temporary Door and Window Insulation
  • Upgrading Appliances to More Efficient Models
  • Seeking out a Cheaper, New Energy Supplier

The addition or improvement of cavity wall insulation is suggested to prevent up to 35% of energy losses. Typically, this energy escapes through external walls of your average homes, without owners taking much notice. One could theoretically save a tonne of carbon dioxide per every square metre (of insulation), over the building’s lifetime, by adding insulation to outdoor walls.

energy efficient chart for utilities

Why You Should Consider a New Boiler

In general, the type of boiler in your home has a lot of baring on whether or not you should replace your boiler with a newer model, and when. If your unit is around 15 years old, it is a condensing boiler. Anything older than that is, more often than not, a non-condensing boiler, which brings along it’s own issues. Most importantly, non-condensing boilers are unable to recycle waste gases created during use, which means it cannot reuse gases – something condensing boilers offer.

Thanks to the conveniences of modern technology, condensing boilers allow hot gases to be reused for heating water, once it passes through the heat exchanger. The result is a decrease in energy waste, simply because of the ability to reuse produced gases, and, ultimately, lower energy bills.

How Condensing Boilers Save Money and Energy

Manufacturers are always coming up with ways to compete by producing newer models that are less of an energy hog, while also being easier on the wallet. As technology advances, newer boilers consume up to 85% less fuel when compared to non-condensing, over daily use. Combi, which may be confused with condensing, actually refers to the type of boiler. Other types of boilers include: open vent, storage and system. Any Combi installed within 10 to 15 years, will most likely be a condensing.

Well known boiler producing brands, such as Ariston, created a name for themselves by producing efficient boilers. When you consider an efficiency of 85%, every £150 spent creates £22.50 of waste, each month on average. With a year’s worth of seasonal changes in temperature and humidity you will be looking at a larger, overall waste in terms of energy and money alike. Although it largely depends on the type of boiler you own, or have chosen to purchase, new condensing boilers tend to start off in the 90th percentile.

There are other ways to boost a boiler’s efficiency, aside from moving onto an entirely new unit. Installing smart thermostats, utilising power flushes and weather compensation technology are just a few of the ways homeowners may boost a boiler’s overall energy efficiency. If you boost efficiency, up to a percentile closer to 94%, you would only be losing around £8 rather than £22.50. Choosing a well-known brand, one that has made a name for themselves with quality and high efficiency ratings, will do more for your home as a long term investment. For example, a Viessmann Vitodens 200-W boiler, provides an efficiency rating in the 98th percentile. A unit such as this could mean hundreds in savings, off of your annual energy bill.

What are Combi Boilers?

Combi, short for combination, boilers happen to be one of the easiest unit designs to install, operate and maintain. Gas combi boilers are one of the most popular choices across the UK, and it’s no wonder, considering how efficient they are energy and space wise. New technology allows manufacturers to produce less demanding compact models, that provide both heating and warm water. Before combi boilers were introduced, it was rather common for homes to store a separate water heater in another space within the house. Thanks to all-in-one units, homeowners can get more out of their money, and floor space.

Gas combi boilers make the most out of the energy required to heat water, without the need to store and heat more water than is actually required through the day. This kind of boiler generates hot water almost instantly, through use of a built-in, pre-heat system. Most older boilers turn on a burner once per hour to maintain the reservoir temperature, for stored hot water, which runs regardless of whether the tap has been turned on.

Choosing the best size combi boiler for your home is vitally important for the overall function of a new unit. Houses with more bedrooms and bathrooms will call for a larger system than a smaller building – typically 20-35KW for a 3 bedrooms. Larger houses often demand larger boilers such as something between 35-42KW. For bigger homes, though, a system boiler may be a better alternative. The heating requirements and overall demand should be considered when choosing the sheer size of your new boiler, to ensure the proper delivery of hot water and heat.

The Most Efficient Combi Boiler

It’s simple, not every boiler is created equal. And, while there are short term ways in which you can regularly save on your monthly utility bills, a brand new name boiler will make much larger improvements over the entire life of your home. Some of our favourite, most suggested units (in no particular order) include:

  • Viessmann Vitodens 100-W Combi

    One of Viessmann’s top selling condensing boilers throughout the UK and Europe. This unit features a compact design, with a low fan speed and overall quiet operation. Boasting an “A” energy efficiency rating, between 4.5-35KW output availability range and backlit LED touch screen for easy access.


  • Viessmann Vitodens 200-W Combi

    Considered one of the most energy efficient combi boilers on the market, the Vitodens 200-W operates at an efficiency level of 98%. Combining weather compensation with high quality materials, Viessmann achieved producing one of the best boilers in the industry. Also providing an energy efficiency rating of “A”, in a compact shape, there is no need for an extra LPG conversion kit. Through use of an optional LAN adaptor, this boiler may be controlled over the internet or by use of a mobile phone. Works quietly in the background, at a volume of 34db.


  • Vaillant ecoTEC Exclusive with Green IQ Combi

    Once it reaches the end of it’s lifetime, Vaillant claims to recycle 85% of their boiler’s materials and components. This quiet unit boasts an “A” efficiency rating, with a flow rate of 17.8 litres per minute. A great option for smaller spaces with a compact shape, featuring dimensions of: 720mm x 440mm x 474mm.


  • ATAG iC Economiser Plus 35 Combi

    Originating from the Netherlands, ATAG has made a strong name for themselves within the heating and boiler industries. Their units provide an efficiency percentile of 94% and higher, with an “A” rating. Their compact size, combined with a built-in outdoor weather compensation technology, makes them a top contender for your next boiler. With a passive flue gas heat recover device, coupled with pre-heat capabilities for instant hot water, it’s a purchase homeowners will take pride in for years to come.

In Conclusion

Regardless of whether you are looking to improve the function and efficiency of your current boiler system, or are just considering purchasing a completely new unit for your central heating, you should look toward a professional for advice tailored to your home. Our expert team of engineers provide unmatched professionalism and quality, in addition to reliable service. In the case of a total boiler breakdown, or even regular servicing, an engineer or technician can be on site within a few days for a total assessment. Customer satisfaction is our top concern, and you are sure to be happy with the result.

Boiler Repair Warrington

Dallam Court, Dallam Ln, Warrington WA2 7LT

Phone:  01925 357398