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Why Replace Your Boiler?

Buying a new boiler is something that many homeowners put off for a long time. That’s no great surprise because of the sheer amount of time, money, and hassle involved in putting in a new on. After all, you have a boiler already and while it might be a bit temperamental, it does the job most of the time and it only needs the occasional engineer visit to put it right when it goes wrong.

However, even though it may feel like you’re saving money now, you could be costing yourself a lot of money in the long run.

If you have to get a boiler engineer out every so often to fix it, it will not have been working at anywhere near its best for quite some time now. Given that a properly functioning boiler can save you up to £200 a year on your electricity bill, it could be that you’re making no savings at all by keeping the boiler you’ve got now going.

And let’s not forget the call-out charges. If your boiler’s magnetic filter breaks, it could cost £300 or more to replace it. Even replacing the timer can cost £90.

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A gas engineer fitting a new gas boiler
Gold pipe from inside a boiler

How Much Does My Old Boiler Cost to Run?

Think back over the last two years – how much have you actually spent on keeping your current boiler? If it’s more than £200, you’re throwing good money and, if you delay it for another couple of years, the total cost of maintaining and repairing your current boiler could total nearly as much as having a brand new one put in instead.

  • If one or more has been happening over the last two years more than you’d like, then it’s time to change:
  • Energy bills seem to be creeping up every three months
  • Boiler makes some really loud, funny, rattling noises
  • Radiators never get as warm as they used to get
  • Boiler is switching itself off for no reason I know of too many times
  • My thermostat doesn’t get the house or the hot water to the temperature I want it to
  • My pilot light is always going out
  • Ever since I had a new conservatory/extension put on, my boiler’s never been the same

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Ideal boiler logo Ferroli boiler logo Baxi boiler logo Potterton boiler logo Worcester boiler logo

How Much Can I Save on My Energy Bills with a New Boiler?

Your Existing Boiler Mid-floor Apartment Terraced House Bungalow, Detached Home, Detached Home, Semi-detached
G £90-£95 £160-£175 £145-£155 £285-£305 £185-£200
F £60-£65 £115-£120 £100-£105 £200-£210 £130-£140
E £50-£55 £90-£105 £80-£90 £160-£180 £105-£120
D £35-£55 £70-£105 £60-£90 £120-£180 £80-£120

On the left of the table above, you can see an energy efficiency rating. “G” is the very lowest rating any boiler can get for its energy efficiency rating. Did you know that many boilers that were state of the art ten years ago would perform badly in today’s tests? If your boiler is more than 15 years old, it almost certainly would fail a modern energy efficiency test completely.

The figures above are from the Energy Savings Trust. They show you the types of savings you can make every year on your heating bills by switching to a model A-rated boiler with thermostatic radiator controls, a modern programmer, and a room thermostat.

Let’s say that you live in a semi-detached house where your current boiler is F-rated. By switching to a new boiler, you’ll save up to £140 a year. If you replace your current combi boiler with a new one and no additional work is needed, it’ll cost you around £2,000. That means that your new boiler will pay for itself in 14 years.

What’s better? To spend £2,000 on a new boiler that will save you money or spend £2,000 over three to four years on a boiler that keeps breaking down and which doesn’t heat your home the way it used to?

What are The Main Types of Boilers?

There are three main types of boilers in the UK today, the most popular of which is the combination boiler. We’ll describe the differences between the boilers shortly but, below, you can see what it would cost, in most cases, to replace your existing boiler with a new one of the same type:

Boiler Type Supply only In its current location In a new location
Conventional boiler £750 £1,650-£1,800 £2,000-£2,200
Sealed system boiler £925 £1,300-£1,450 £1,800-£2,000
Combination boiler £955 £1,925-£2,125 £2,500-£2,700

Boiler Types

  • Combination Boilers
  • Conventional Boilers
  • System Boilers
  • Combination Boilers

    Combination boilers

    The Best Combi boilers provide heat on demand to deliver hot water to the taps and heat to the radiators. Compared with conventional and system boilers, they don’t require a separate water tank and, in terms of their overall footprint, they’re generally the smallest types of boiler on the market – great if your home is not the biggest.

    Combi boilers are the most popular types of boiler in the UK but they struggle with power showers and providing hot water to more than one tap at any given time.

    combi boiler control panel

    Conventional Boilers

    Conventional boilers

    Sometimes called open vent boilers, heat-only boilers, regular, or traditional boilers, conventional boilers require space for a storage cylinder (for example, an airing cupboard or large utility room) and a water tank (generally located in a loft).

    They take up far more room than combination boilers but, unlike combi boilers, they handle power showers well and they can distribute hot water at a high pressure to two or more taps at the same time.

    Where they struggle is that, once the hot water has been used up, you’ll not have any more hot water until the storage cylinder is full again.

    System Boilers

    System boilers

    System boilers are even bigger and require more space than conventional boilers however they’re really only suitable for really large premises with lots of taps that require hot water at the same time.

    As with a conventional boiler, you have to wait for the storage cylinder to heat more water up if it has been emptied through heavily family usage.

    boiler being replaced

    What Size boiler Do I Need?

    There are three main groupings of boiler according to size – 24-27kW, 28-34kW, and 35kW and above. Different types of property require different sized boilers and this table below will give you a good guide to the size you need for yours.

    Bedrooms Bathrooms Radiators Property Type Boiler size recommendation Boiler type recommendation
    1 or 2 1 10 Small mid-terraced , Small bungalow, Apartment 24kW-27kW Combi
    3 or 4 1 or 2 15 Medium mid-terrace, Medium bungalow, Semi-detached house 28-34kW Combi
    4+ 2+ 20 Substantial semi-detached, Detached house 34-42kW Combi or Conventional

    The size of your boiler gives you an indication to how much hot water it can produce at any one time to provide to your radiators and your taps.

    It’s important to get this right because if you or your installer choose a boiler which is too small, it will have ongoing problems providing you with the amount of water you need. You may suffer from real water pressure issues particularly if someone is running a bath and someone else is doing the washing up at the same time.

    If you or your installer choose one which is too large, then hot water and heat will not be a problem. What will be negative for you and your family is that so much energy will be consumed keeping the boiler going that savings on your utility bills may be wiped out or you may end up paying more than you did before.

    On most occasions, your installer will recommend that you do a straight swap to the same type of boiler in the same location as it is now. This will save you money and greatly reduce the time that installation takes. However, after speaking with you about how you use water, your installer may recommend a switch to a conventional boiler (or a system boiler if your home is particularly large).

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    What to do next?

    You will be pleased to read that we have a vetted panel of reliable suppliers and installers of replacement boilers whom we can put you in touch with. They will be able to provide you with one or more free, no-obligation competitive quotes for your perusal.

    When Should you Replace a Boiler and Why.

    Did your boiler withstand the Beast from The East? Colder temperatures can often lead to boiler problems. When it is cold the boiler naturally becomes the most important technology in the home so it is very important to know that your boiler is working well.

    Modern boilers are currently expected to last up to 15 years. More expensive boilers that are well looked after can last up to 20 years.

    A new energy-efficient boiler can significantly reduce your energy bills, as shown by the Energy Saving Trust below. The not for profit energy group Ebico suggests that heating your home is likely to account for up to two-thirds of the total expenditure on energy in the home.

    England and Scotland

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    Old boiler rating Semi-detached house Detached house Mid terrace house Mid floor flat
    G (<70%) £210 £320 £180 £100
    F (70-74%) £145 £220 £125 £70
    E (74-78%) £125 £190 £105 £60
    D (78-82%) £110 £170 £100 £55

    Things You Need to Consider Before Getting a Boiler Replacement:

    To replace your existing boiler you need to know that you have the means to pay for it either in a lump sum or on a monthly boiler payment plan.

    Which? magazine has rated different boiler brands, including leading boiler brands such as Worcester Bosch, Viessman, Baxi and Vaillant. They discovered that boiler prices range from £600 to £2,400. You then need to consider the boiler’s installation cost, which can range from £400 to £1,500 depending on the part of the country that you live and what you are having done.

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    Someone fixing a broken boiler
    Woman using a tablet

    8 Signs You Need a New Boiler

    According to Plumbcare there are a number of tell signs to suggest that it may be time for a new boiler beyond the boiler age and knowing that you have the means to pay for the boiler.

    • The energy efficiency rating of the boiler is below ‘A’
    • The boiler flame burns yellow and not blue
    • You seem to be having to get your boiler repaired more often
    • The cost of maintaining the boiler are increasing
    • Your house isn’t as warm as it should be
    • Your fuel bills are increasing
    • Your boiler makes strange noises
    • Strange smells are coming from your boiler

    If you are considering replacing your boiler, the Energy Savings Trust recommends getting three quotes from different installers and making sure that they are on the Gas Safe Register.

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    Privacy Notice

    Leads2Trade Limited and our associated consumer brands (Trading as [Compare Companies/Double Glazing on the web/ Conservatory Online Prices/ Leads2Trade]) of A18, The Embankment Business Park, Vale Road, Heaton, Mersey, Stockport, Cheshire, SK4 3GN Company No 05987279 have created this Privacy Notice to help you understand what personal data we process and how we use it in our business dealings with you. We are registered with the ICO (Registration No: Z9692711).

    If you have any questions about this Privacy Statement, you can contact us by email at  For the purposes of Data Protection legislation in the UK, we are a Data Controller. Our website is not intended, and we do not knowingly collect data relating to children.

    This Privacy Notice is intended for:

    • Our Website Visitors
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    • Our Business Customers

    How do we process your personal data?

    So that we can provide a service to you need to process some of your personal data.  We make sure that we only collect what we need and have outlined below the various ways in which we process your personal data:

    When you visit our website: We use cookies on our website which collect various types of personal data. This will include details about your visits to our website; page views, downloads, navigation and exit; IP address; geographical location; browser type and version; operating system; referral source; length of your visit.

    Some of these cookies are necessary to ensure that the website works correctly, and other cookies require your consent.  You can find out more about our cookies and how you can manage your consent in our cookie policy here.

    Our website may contain links to other external websites.  We aren’t responsible for the practices, policies or content of such websites and suggest that you check their privacy policies to ensure that you are happy to continue browsing.

    When you become one of our consumer customers: We will process your name and contact details (phone number, email and postal address) so that we can fulfil our contract to you by providing you with the home improvement quotes you have requested, to answer any enquiries you may have and to monitor how the suppliers we work with are performing.

    For certain home improvement enquiries where we are unable to reach you by telephone we will send you an email to introduce you to a potential company who can help you with the specific product that you are looking to receive quotes for. We currently work with one company (WarmZilla Ltd) for Boiler enquiries, one company (Safestyle UK plc) for double glazing enquiries and one company (Verisure Services UK Ltd) for Alarm enquiries.

    We will call you to check that we have the correct information and learn about how we can connect you with the best quotes in your geographical area. We may send you an SMS message if your enquiry is received outside our operational hours or to provide an update on the progress of your enquiry. An SMS opt will be provided after failure to connect via phone.

    Our phone calls are recorded for training purposes however, if you are uncomfortable with this, we will not proceed with the call and delete the recording.  We also use aggregated and anonymised data to keep records for our own business use.

    When you become one of our business customers: We will process your name and business contact details (phone number, email and postal address) so that we register you and put you in touch with our consumer customers who have requested home improvements quotes from you.  Our contract is with your business however we will process the personal data of our business customers under our legitimate interest.  We have done a balancing test to ensure that we are processing your personal data fairly and respectfully.

    When you send us an enquiry: You may have sent us an enquiry via the contact page on our website.  We will collect your name and contact details as it is in our legitimate interest to do so that we can enter into correspondence with you and answer your enquiry.

    How long do we keep your personal data?

    If you have consented to non-essential cookies:  You can find out more about our cookies and update your preference on our Cookies Consent Management Platform.

    If you are a consumer customer of ours: we will keep your personal data for as long as we have business dealings with you and then for a further 12 months.  This is because the quotes that you obtain are valid for up to a period of 12 months and it is important for us to be able to assist with any enquiries you have during that time.

    If you have consented to receive email marketing from us, we will keep your personal data until you unsubscribe. If you choose not to engage with our email marketing messages for a period of 12 months, we will not email you again and put your personal data on a suppression list.

    If you are a business customer of ours: we will keep your personal data for as long as we have a contract with you and then for a further 7 years in accordance with HMRC guidelines.

    How do we use your personal data to communicate with you?

    Non-Marketing Communications include: service messages regarding quotes or appointments from our third party services to enquiries and other communications to ensure that we deliver the services you expect from us.

    If you are one of business customers, you will receive emails regarding your registration, services messages and invoices.  You will have access to our members area dashboard portal where you can find more information about your account details with us.

    Marketing Communications include: Emails regarding other services we offer as well as content marketing we hope you will find useful. If you are one of our consumer customers, you will only receive email marketing from us if you have given us your consent. We do send out unsolicited email marketing messages to our business customers when we feel we have a legitimate interest to do so. You are welcome to unsubscribe from marketing messages at any time.

    If you have consented to marketing cookies such as Facebook Pixels you may be served Facebook Ads regarding our services.  You can change your cookies consent at any time by visiting our Cookie Consent Management Platform.  You may also wish to change your Facebook settings if you don’t want to see targeted advertising.

    Social Media: We use Facebook, and Linkedin (for business purposes). We sometimes use paid advertising on these platforms, but we will only use custom audiences with your consent.  You can find a copy of this Privacy Notice on our Facebook page in the ‘About’ section.

    Social Plugins: We use social plugins on our website pages which allow you to share products with your friends and families.  These buttons are deactivated by default and only activated once you click on them.  When you click on these buttons your personal data will be transferred to the plugin provider.  This will include IP addresses which are then used to serve you relevant ads.

    Who has access to your personal data?

    We share your personal data with various organisations so we can fulfil our contract with you to help us run our business and to fulfil our legal obligations.

    These include: Marketing Agencies, Accountants, Webhosts, IT and CRM Agencies. We also use Microsoft, DropBox, and Infonotes to ensure that we run our business efficiently.

    If you are one of our consumer customers: we will share your details with the suppliers in your geographical area who are able to give you a quote for the work, you require.  Our suppliers are registered with us and we ensure that they are reputable and certified where appropriate.  We will discuss this with you in our phone call so that you are aware of what is happening every step of the way.

    We ensure that our systems are robust, and we will only share your data with organisations who have appropriate safeguarding mechanisms in place such as Standard Contractual Clauses.  We have Data Processing Agreements with our Data Processors and never sell personal data to third parties unless we have your agreement to do so.

    If Leads 2 Trade is sold or transfers its assets to another party, your personal data could be one of the transferred assets.  If your personal data is transferred it will remain subject to this Privacy Notice.  Your personal data will be passed onto a successor in the event of a liquidation or administration.

    What are your rights?

    You have several rights which you can access free of charge.  In certain circumstances we reserve the right to charge a reasonable fee if your requests are unfounded or excessive.

    You have the right:

    • To be informed about the collection and use of your personal data.
    • To access your personal data via a Data Subject Access Request (DSAR)
    • To have inaccurate personal data corrected or completed
    • To have your personal data erased
    • To restrict our processing of your personal data
    • To request the transfer of any personal data you have provided to us
    • To object at any time to direct marketing
    • To object to automated decision making and profiling

    We don’t use any automated decision making.

    For more information about these rights and when you can request them, please visit the Information Commissioners Guide to Data Subject Rights

    If you wish to exercise any of these rights, please contact us by email at We will respond to you within one month.  If your request is complex and we require more time, we will contact you and let you know within the first month.

    How can you submit a query or a complaint?

    We are always happy to answer your queries regarding privacy.  Please contact us by email at 0800 124 4308

    If you have a complaint, please get in touch with us so that we can resolve any concerns.  You also have a right to lodge a complaint with the Information Commissioner’s Office if you believe your personal data has been processed in a way which does not comply with Data Protection Legislation.  You can call the ICO helpline on 0303 123 1113 or visit their website here.

    Changes to this Privacy Notice

    We keep this Privacy Notice under regular review.  The most recent update is 4th April 2022