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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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    Please read this privacy policy before using the website.

    In this privacy policy references to (“we” “us” and “our”) is to Leads 2 Trade Ltd. Leads 2 Trade Ltd is incorporated in England with number 063990 and its registered office address is A18 The Embankment, Riverview, Heaton Mersey, Stockport, SK4 3GN. We provide a price comparison website called References to “you” and “your” are to the individual reading and using our website. For convenience we use the words “information” and “data” interchangeably. “Website” means “”.

    How our business works for you

    We endeavour to procure bespoke, free, no obligation quotes from potential suppliers of products and services to each of our customers, such as you, that make an enquiry via our website. This is a quote finding and supplier introduction service; we do not ourselves provide the products and services that you may require. We provide these services to consumers and businesses.

    We aim to provide 1-4 quotes within 36 hours from your online completion of an enquiry working in conjunction with data controllers who specialise in the delivery of competitive supplier quotes. The number of quotes that we will try and help you to receive does vary depending on the product or service that you are looking to receive quotes for. If we do not call you before passing your details to the companies that supply the quotes we will stipulate the maximum numbers of companies that we will pass your details to when you enter your details in our product specific web form. If you have enquired about double glazing on our website one of the companies that we work closely with is Safestyle UK plc. Depending on your postcode area and requirements we may pass your details to Safestyle UK plc. We will reconfirm this when we speak to you on the phone.

    To be able to deliver suitable quotations to you we send your personal data and the details of your requirements to potential suppliers.

    How can you save money with us?

    We offer a price comparison service. All of the companies that we deal with know that you are conducting a comparison, hence they will often offer cheaper prices, for example on labour, than they would were they approached directly by a customer, hence our service has the potential to get you big discounts.

    Your consent

    To provide our service we first explain in more detail how we use your personal information so that the consent you give us, which is detailed in the next paragraph, is fully and fairly informed.

    You give us consent to use your personal information as outlined in this privacy statement when you manually enter information about yourself on our website and submit it as a request to receive our quote finding service. This consent allows us to use your data as described in this statement of privacy policy. If you do not provide your consent by submitting your details / clicking on submit we will be unable to provide our quote finding service to you.

    You may seek further information about the scope of the consent as well as vary or withdraw your consent as outlined under the heading “What are my rights in relation to the personal data that you hold?”

    What information do we collect?

    We obtain personal information and business information (for business products and services) about you, only from you, and do not acquire information about you from anyone else.

    Data entry

    First, to provide our quote finding service we will ask you manually to supply us via the website with your personal details namely: First Name, Last Name, Email Address, Telephone Number, Street, House Number, Post Code and Company Name (for business products & services). You may also be asked on the website and by follow up telephone call for further information to help us process your request for quotations.

    IP address

    Second, information is obtained electronically when one computer connects with another across the Internet as when you visit our website such as such as your computer’s unique numerical Internet address (IP address). Information so obtained while necessary to the operation of and communication between computers may well also allow you as owner of the information to be identified, much like a name and address, and thus constitute personal data. The law requires such information to be identified and so far as practicable, for informed consent to be given by you, before the electronic information is passed from your computer to ours. Further explanation about the automatic electronic collection of your information is provided under the heading “Your electronic information”.

    We do not use your IP address to identify you personally but these logs may contain unique identifiable information left by your computer.

    We may use IP addresses to ensure that we are not receiving fraudulent registrations from the same IP address as evidence in the event of being challenged for unsolicited marketing. The IP address log would show that a registration took place on a given day.

    How does our service work?

    We provide our service to both consumers and businesses. The way the service works is very similar but due to the nature of the products and services and the suppliers of these, the processes are slightly different. From your perspective, you will receive the same level of service from us and your expectations in terms of receiving quotations from appropriate suppliers that you can then choose from are the same.

    The processes how your data will be used are explained below.

    Consumer products and services

    After you submit your details we may phone you to discuss the products or services you seek from a suitable supplier, to check we’ll be able to meet your needs and, should you still wish to go ahead with us, to get you free and no-obligation quotes. This will normally be us but below explains how it works with the different products and services that we are able to help in the quoting process with.

    At times we work as the appointment booking agent for the companies working on our network so even if you have requested direct contact from the company you may still receive a call from us in order to book the appointment for your quotation.

    Business products and services

    Enquiries for business products and services are handled by Leads 2 Trade Ltd.

    If you have come to CompareCompanies looking for businesss products or services Leads 2 Trade will transfer your business and personal details on to up to four companies. Before passing your details to up to four companies we will check your details and match your details to a number of businesses to find the best deals. The businesses may contact you by email, telephone (including automated calls) and/or SMS. Quotations may be provided to you by appointment or electronically and you will be told over the phone how you can expect yours to be delivered.

    How we get the quotes using your details

    Consumer products and services

    We take your details and pass them on to one or more companies that can provide the type of product or service that you are looking for and will invite those companies to submit quotes for your consideration.

    We pre vet all companies that join our quote finding service as potential suppliers to our customers, such as you, to ascertain as best we can that they will be suitable for your requirements and will keep your personal data safe. However, the final responsibility for determining suitability to supply the product or service lies with you, the customer, when considering the detailed quotations and deciding if you wish to contract with a given supplier or suppliers.

    Business products and services

    We take your business and personal details and pass them to a specialist business solutions price comparison data controller. They will check your details and match your details to a number of businesses to find you the best deals.

    They pre-vet all companies that join our quote finding service as potential suppliers to our business customers, such as you, to ascertain as best we can that they will be suitable for your requirements and will keep your personal data safe. However, the final responsibility for determining suitability to supply the product or service lies with you, the business customer, when considering the detailed quotations and deciding if you wish to contract with a chosen, given supplier.

    Do you offer a guarantee or warranty for the products and services I eventually buy through your suppliers?

    We are not responsible for the standard of work carried out by the suppliers that provide you with quotations as a result of your enquiry via our site. There is no warranty provided by us, implied or otherwise for the products or services provided by any suppliers that you contract with. Individual suppliers may offer their own warranties, but these and any standards of workmanship are not in any way associated with Leads 2 Trade Ltd. or its partners.

    Keeping your details safe…

    We take the security of your data very seriously from the outset. Our web address is HTTPS. (HyperText Transport Protocol Secure) This is the protocol used to access a secure Web server. We use https:// as the prefix to our Web address rather than the common http://, so that your session is managed by a security protocol and the transmission of data is encrypted to and from the Web server.

    Secure certificates (SSL Certificates) are in place. These are small data files that digitally bind a cryptographic key to an organisation’s details. These allow secure connections from a web server to a browser. SSL is used to secure the transfer of your data to our server.

    Our server is protected by a firewall. Log in details are securely shared internally between employees.

    Any personal data held in our database is encrypted. If there are any security breaches, your data is encrypted and therefore secure.

    Each supplier to whom we pass your information in order to provide you with quotes has contracted with us to keep your data safe and use it only for the provision of a quote and, if selected by you, to provide the product or services you require.

    We always have contracts in place with the companies that we pass your details on to both to ensure that they will keep your data secure and that they comply with the rules of the GDPR (General Data Protection Regulation) which we also operate within.
    Please be assured – we will not use your details for marketing or use or pass your details to third parties other than as described in this statement without explicit consent from you.

    Finally, please note that the transmission of information via the Internet is not completely secure. Although we will do our best to protect your personal information, we cannot guarantee the security of your information transmitted to our site; any transmission is at your own risk. Once we have received your information, we will use strict procedures and security features to try to prevent unauthorised access.

    Lawful basis for processing your data

    We rely on your explicit consent to process your personal data. This means that we ask you to consent to the following use of your data:

    Business users only

    We will email or text you about similar products and services. We will only do this if you haven’t opted out of receiving such emails or texts.

    To create custom and lookalike/ similar audiences

    We like to work with Facebook, Google and other platforms (“Platforms”) to reach out to you with adverts for Other Products. We also like to use Platforms to reach out to other people who might like to use our quote request service.

    We do this in two ways. In both cases, your data, along with other data, is used to create a custom audience and/or a lookalike/similar audience. Whenever an audience is shared with a Platform, the data is first hashed and pseudonymised, meaning that any data within the audience that could identify a person is replaced with an artificial identifier. So, the process is secure. Also, we don’t share more data than we need to for the purpose of creating the audience.

    Transfers of data outside the EEA (European Economic Area)

    We share your personal data within our business and with data processors who can find suitable product and service suppliers for you. Your data will then be used to enable suppliers to provide quotations and potentially move towards a contract with you.

    Some of the suppliers that may offer products and services to you are based outside of the EEA.

    We transfer your data as detailed above with your consent.

    Data Retention Policy

    We keep your personal data for no longer than is necessary for the purposes for which it is being processed. This is to reduce the risk that it will become inaccurate, out of date or irrelevant.
    We ensure that your personal data is securely disposed of when no longer needed.

    What are my rights in relation to the personal data that you hold?

    Your rights are embodied in the contract formed between us when you visit the website (as subsequently augmented when submitting your personal information and, if you are called, when speaking on the phone) and as contained in the General Data Protection Regulations 2018 – also known as GDPR.

    If you have any questions or concerns please first read this section of the statement and then email our Data Protection Officer on, They will be pleased to assist before as well as after you may have provided personal information to us.

    You may also write to our Data Protection Officers either at our registered office address stated at the outset of this statement.

    If you need more information about data protection you might contact the Information Commissioner: see

    The GDPR provides individuals with the rights in relation to personal information about themselves which is held by us as summarised in the table below.

    Some of the rights are unlikely to be of practical use. For example, if you wish for a copy or correction or cessation of use of some or all of your personal data we, our suppliers and our other introducing companies are likely already to have eradicated it from our or their system given the short periods your date is retained and its limited use.

    Nevertheless, the GDPR principle of transparency in particular provides you with the right to enquire and to be informed and we briefly set out all of the rights here. Further information about the rights and the circumstances in which they apply may be obtained from a number of published sources and from our fact sheets which are available on request.

    Information Right – you may require us to provide a more detailed explanation of how we collect, process and use your personal information.

    Personal Data Access Right – you may require us to provide an electronic copy of your data free of charge.

    Personal Data Correction Right – you may require us to correct your personal information as held by us.

    Personal Data Erasure Right – you may require us to permanently erase the personal data that we hold about you.

    Data Processing Restriction Right – you may require us to stop using your data for particular purposes such as mailing or profiling.

    Data Processing Objection Right – you may require us to suspend using your data if for example it is incorrect or you simply wish to withdraw your consent.

    Data Portability Right – you may require us electronically to transfer your personal information to another supplier, for example to facilitate switching.

    Automated Decision-Making Right – you may require us not to make decisions about you relying solely only on a computer decision.

    Breach Notification Right – if in the unlikely event there occurs a breach of security which is likely to result in a high risk to your rights as a data subject, we must inform you without undue delay.

    How else can we help?

    Rights aside, if you have a change of heart and do not wish us to pass your information to potential suppliers or another introducing company please let us know immediately by email or, should we call you, during our phone conversation and we will remove your information from our and their systems.

    You are not bound to enter into a contract with any supplier that provides a quotation to you and can unsubscribe from any communications related to your enquiry from them or us at any time.

    If you have any questions, please email

    Your electronic information

    Your electronic information means information relating to you, which may or may not be capable alone or with other information of identifying you of the kinds illustrated by what follows in this section. Your electronic information is obtained by us in by: (A) the use of cookie devices lodged within your computer (B) information disclosed by your browser and (C) features of your computer recognised and “remembered” by ours.

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    Cookies save you from re-entering information when you return to the site. This other data is collected by cookies from your navigation around the site. A cookie is a small amount of data, which we send to your computer. The data is then stored on your browser or hard disk. Most web browsers can be set to prevent you from receiving new cookies, notify you before accepting cookies or disable cookies altogether. Details about this can normally be found in the Help facility provided with your browser. If you disable cookies, you will not be able to receive personalised facilities. If you do not want your visits to our website to be monitored in this way you can disable certain cookie functions as described below: If you wish, you can usually adjust your browser so that your computer does not accept cookies. If you do this, you will still be able to browse around the site but certain functions will not be available. Alternatively, you can adjust your browser to tell you when a website tries to put a cookie on your computer. How you adjust your browser to stop it accepting cookies or to notify you of them, will depend on the type of Internet browser programme your computer uses. If your computer uses Microsoft Windows Explorer or Mozilla Firefox, you will need to follow these instructions after clicking onto this link Go to the heading “Manage Cookies”. Click onto the option you prefer, either stopping cookies being installed, or notifying you of them. From the list provided, click onto the programme, which your computer uses. If this is not shown on the list, click on the “help” heading on the bar at the top of this page, search for information on “cookies” – an explanation of how to delete cookies will appear, then follow these instructions.

    B) IP Address

    Your browser generates other information, including which language the site is displayed in, and your Internet Protocol address (“IP address”). An IP address is a set of numbers which is assigned to your computer during a browsing session whenever you log on to the Internet via your Internet service provider or your network (if you access the Internet from, for example, a computer at work). Your IP address is automatically logged by our servers and used to collect traffic data about visitors to our web sites. We do not use your IP address to identify you personally but these logs may contain unique identifiable information left by your computer.