Category - Boilers
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Ryan Gill, Engineer

1 Jan : Updated 15 Apr ● 7 min read

How much energy can you save with a new boiler?

Heating and hot water account for over half of your annual spend on energy bills, and with current energy prices and the cost of living crisis, we’re all looking for ways we can be more energy efficient in our homes.

Cut your bills with a new boiler

Depending on the efficiency rating of your current boiler and the type of home you live in, you could save over £500 a year on your energy bills simply by upgrading to a new A rated boiler – without having to change the way you use it. Have a look at the graphs below to see what you could save based on your circumstances*.

Detached house

If you live in a detached house you could save up to £540 a year on your energy bill if you're upgrading from a G-rated to an A-rated boiler – over a fifth of the cost of the average new boiler installation. And with the added energy-saving technology in the Google Nest Learning Thermostat, which comes in our tech bundle, you could save over £700 per year by upgrading!


Semi-detached house

Upgrading your boiler in a semi-detached house could save you £342 annually, a massive 20% of the average UK energy bill which comes in at £1,690 a year. Add to that the 10% saving from using a Google Nest Learning Thermostat, and you could save over £460 a year on your energy bills!  



If you live in a detached bungalow, you could save up to £299 a year on your energy bill simply by upgrading your boiler to a new A-rated one, and if you add Google Nest Learning Thermostat to your package, you could save an additional 10% on your energy bills, taking the total savings to over £400 per year!



Upgrading your boiler in a flat could save you up to £125 a year on your energy bills – more than the average monthly energy bill for property this size! Plus, with the added energy-saving technology in the Google Nest Learning Thermostat, your annual energy savings could be up to £175 per year.


Mid-terrace house

In a mid-terrace house you could see annual savings of up to £280 simply by upgrading to a boiler with an A efficiency rating. Plus, if you add a Google Nest Learning Thermostat, you could save an extra 10% per year on your energy bills, taking the total saved to £380!


*savings shown based on data from Ofgem for typical energy consumption and energy unit rates, and using data from Google on energy saving using a Nest Learning Thermostat

While the cost of a new boiler may seem daunting, rising energy prices mean the savings you make on your energy bill will go a long way to offsetting this and you’ll make your money back in energy savings in less time than you might think…

According to Which, the average cost of a new gas combi boiler including installation is £2,597 – so if you live in a detached property and upgrade from a boiler with a grade G efficiency rating, you could have saved back the cost of your new A rated boiler in just over 4 years!

Even better, here at BOXT we offer a range of finance options** to help spread the cost of your new boiler, as well as a price promise that if you find a like-for-like offer that’s cheaper than we’ve quoted you, we’ll either beat the price or give you a £50 Amazon voucher – it’s win-win!

See how much you could save with a new boiler

See how much you could save with a new boiler

Cut your energy bills by up to £60/month with a new boiler & smart thermostat

Start saving now

Stay on top of the temperature in your home 

Google Nest Learning Thermostat

Using smart technology like the Google Nest Learning Thermostat can help with ensuring you aren't wasting any energy on heating your home, as you can set schedules around your usual routine and lifestyle to make sure your heating is only on when someone will be at home. Or, if you're not sure what the best times are to schedule the Nest Learning Thermostat can even learn from your routine and make changes to ensure you're being as energy efficient as possible. Data from Google suggests that you can save up to 10% annually on your energy bills by using a Nest Learning Thermostat! If you don't have a smart thermostat, still make sure you make full use of the thermostat controls to programme your boiler to only come on when you need it. 

Turn the temperature down

When you do have your heating on, try turning the temperature one degree lower than you usually would. You could saving over £100 a year on your energy bill without feeling much of a difference, if any! You can also use Thermostatic Radiator Valves (TRVs) to control the temperature in each individual room. Experts recommend some rooms, such as the bedroom, are kept slightly cooler than others, and so by setting different temperatures throughout the home you can make sure there's no energy being wasting keeping rooms warmer than they need to be. Find out more about the ideal temperatures in your home with our Optimal Boiler Calendar

Check the flow temperature

You can also control the temperature of the water that's supplied to your radiators and hot water taps directly from the boiler and hot water cylinder, if you have one. If these are currently set pretty high, turning down the flow temperatures can help you make savings on your energy bills without feeling a difference to your comfort levels around the house! If you have a combi boiler, it's important that you don't set the temperature any lower than 55°C, and if you have a system or standard boiler with a separate hot water cylinder then the minimum temperature is 60°C. Any lower than these and there is a risk of bacteria forming which can be hazardous to yours and your family's health.

How else can you reduce your energy usage?

Service your boiler and make savings

Making sure you get a regular boiler service will ensure that it continues to run as efficiently as possible as well as helping to prolong the lifespan of your boiler, so you keep your energy bills low and don't have to think about paying for a new boiler for even longer. With our Service plan you can spread the cost of your service and we'll arrange it for you, so once you've had your new boiler installed you can sit back and relax safe in the knowledge we've got you covered. 

Get a system flush and install a filter

Having a magnetic filter installed, if you don't have one already, will help keep your system clean and running efficiently as possible, as well as getting a system flush to give your system a really good deep clean. With BOXT when you get a new boiler we perform a chemical system flush and install a filter as standard. 

Benefit from a smart meter

Installing a smart meter can help you better understand your energy usage - so you know when you're using the most energy, and which appliances are the biggest culprits of driving up your energy bill. Once you know this, you can look at ways you can makes small day-to-day changes to use less energy and keep your bills down.

Top up the insulation

Insulating elements of your heating system such as water tank, pipes and radiators is a quick and easy way to save money on your bills, as well as ensuring your roof, wall and floor insulation are up to scratch. Plus, with the Government charging 0% VAT on energy saving materials like insulation until 2027, as well as the Great British Insulation Scheme offering financial support, now is a great time to invest.

Upgrade your boiler and start saving now

Upgrade your boiler and start saving now

Get a quote for your new boiler with next-day installation available

Get a quote

**finance options are subject to status, T&Cs apply.