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Updated: April 6, 2024

Are you in search of the best heat-only boilers for your heating system? Selecting the right boiler is essential for efficient and reliable heat distribution in your home. In this comprehensive guide, we’ll explore some of the top heat-only boiler brands, their key features, and pricing options to help you make an informed decision.

What are the best brands of heat only boilers.

Worcester-Bosch, Vaillant, POTTERTON and Baxi are among the best brands of heat only boilers.Best Heat Only Boilers, Boiler Brands & PricesBest Heat Only Boilers, Boiler Brands & Prices 1

Please find out about the Best Heat Only Boilers, Boiler Brands and boiler Prices here:

To begin with, Heat-Only or common boilers can cost £500 to £2000. Accordingly, the price depends on the brand and the size of the model you want.

a regular boilers is the traditional heating system you can find all across the UK. It is also known as heat only boiler or a conventional boiler. All in all, a regular boiler consists of a big tank of water in the loft and a hot water cylinder in an airing cupboard. If you have these two items in your home, then you have a regular boiler.

These boilers are the traditional domestic boiler type, that we often find in homes across the UK which were built before 1970.

Read about: Top UK System Boilers

Boiler installation

Where are heat only boilers usually located?

These boilers directly provide heating and hot water from a storage cylinder, usually installed in the airing cupboard in your kitchen.

A tank, usually in your attic, would supply the boiler with cold water, using gravity because that’s where they work best.

Of course, the expansion cistern is separate from the boiler. This means that this boiler system needs more space as a result.

Price Range:

The Heat-only boilers differ greatly in price depending on the brand in question. Moreover, these models usually start at £500, and reach up to £2000 for some of the more well-known brands and models.

Read more: Boiler Replacement And Installation Guide

Boiler Brands & Prices… – heat only boilers

# Worcester-Bosch

  • WB- GREENSTAR UTILITY 50 – 70 (OIL) – Typical Price of £1,700 – £1,900
  • GREENSTAR FS 42CDI REGULAR – Typical Price of £1,500-£1700
  • GREENSTAR 30CDI REGULAR – Typical Price of £1,200-£1,300

# Vaillant

VAILLANT ECOTEC PLUS 428 – Typical Price of £800 – £900

ECOTEC PLUS 415 – Typical Price of £600-£800

Heat Only Boilers Prices and Sizes

Basically, the cost of your boiler depends on the size of your home and the fuel type you are using.

Heat-only boilers are perfect for larger homes as they provide a high flow rate, are able to meet high hot water demands, and you are able to use multiple taps or showers at any given time.

They will, however, need more space than other boiler types such as the combi boiler. In another case, the use of hot water is limited by the size of your cylinder. So once it’s empty, you have to wait for it to reheat.

Read more: New Boiler Cost

Brands and prices for different sized homes:

Heat only boilers for smaller homes

If you live in a small property and space is of primary concern, you can choose more compact and wall mounted options for heat only boilers.

Read about: Boilers On Finance# POTTERTON PROMAX 12 HE PLUS SLIMLINE

Output – 12;15;18;24;32KW

Price: £500-£600


Output – 12;15;18;24;30;35KW

Price: £600-£700

Heat only boilers for medium to large homes

For the most part, Medium and large sized homes need a heat only boiler, with a high output. To make sure that you are able to heat your home entirely.


Output – 38KW

Price: £1,200-£1400


Output – 30;42KW

Price: £1,500-£1700

Read more: Best Heat Pumps, Brands & Pricing

What to consider when getting a heat-only boiler?

Firstly, the cost of installing a new heat only boiler depends on whether you have a similar system in place at the moment.

A heat-only boiler needs the use of two water cylinders, one in the attic and the other, usually in the airing cupboard.

It is usually less expensive to upgrade from a similar system where the external pumps are already in place than to convert your current plumbing to fit a new heat-only boiler.

It’s important to place safety ahead of cost-cutting when installing a new boiler, .

Always ensure that your boiler engineers are gas safe registered because this will ensure that your installation will meet the legal and safety guidelines.

For one thing, always check the quality and standards of the work that they carry out because this will ensure that you are happy with the quality of work.

The Let’s Heat boiler installation & repair team are all fully qualified to the highest standards and take pride in our exemplary work standards. This includes completing all boiler installation requirements regardless of the time and day you need our assistance.

Our team of high quality professional engineers have an extremely high 4.9 out of 5, Trustpilot score given to us by our happy customers and we are fully accredited by Gas Safe and Corgi registered, as well as FCA approved for all of our financial transactions.

Read more: Best combi boilers & boiler brands

What are the benefits of a regular boiler?

Replacement is simple and easy

Replacing your old regular boiler with a newer version is less costly and damaging to your home. So it’s always the safer option to go with if you don’t want to spend a lot or worry about damages.

Meets your high demand of heating and hot water

If you have a home with multiple bathrooms, then a regular boiler is a great choice. It can meet your demand for hot water and heating. With a large capacity to store hot water, it means that you can use several taps and outlets at the same time.

More efficiency

Older boilers with no condensing technology should be replaced with a condensing boiler. Condensing boilers are more efficient and consume less energy. As a result, they will reduce the cost of your heating bills. Nowadays, some regular boilers are 97% efficient.

Able to have an immersion hearer as a backup

A backup immersion heater would make sure that you don’t go out without hot water in case you boiler breaks down. The immersion heater would be fitted in the hot water cylinder.

Solar compatibility

presently, you can use solar thermal panels to produce hot water using solar power. Just make sure that your cylinder and the model you buy are compatible with solar thermal.

Read about: The Best Brands of System Boilers & Pricing

What are the disadvantages of regular boilers?

Hot water isn’t always instant in busier times

Once you use all the stored hot water in your cylinder, you have to wait for some time to be able to use hot water again. Always buy a cylinder with the capacity to meet your hot water demands and needs.

Needs lots of space

Regular boilers need space for the water tank and the hot water cylinder. That’s why it’s not a good choice for smaller homes that don’t have much space. For smaller homes, a combi boiler is more suitable.

Installation can be costly

Because there are many parts to be installed around the house, a new boiler installation can be pricy. Aside from being expensive it can also take a lot of time.

Read more: Combi boilers common faults  

What is meant by a Condensing Boiler?

The terms condensing and non-condensing can be confusing to people shopping for a new boiler.

Presently, it is stated by law that new boilers must use condensing technology. In short, you don’t have to worry about getting a condensing boiler.

Condensing is not a type of boiler, but rather a technical feature. In a Condensing boiler you get a much bigger heat exchanger. They also produce additional heat from the fuel. The same fuel that would have been wasted in a non- Condensing boiler. As a result, they are more efficient.

non-condensing boilers are less efficient by 50% since a lot of heat was lost in the combustion exhaust gases. On the other hand, new boilers would capture this heat and use it to heat water.

condensing boilers are energy efficient by 90%. They use excess energy to heat your property. Not to mention, they are environmentally friendly and reduce your heating bill.

We don’t just fit heat only boilers!

In addition to heat-only boiler installation we also fit other boiler types like:

  1. The Common, Heat-Only Boiler
  2. A System Boiler
  3. Combi Boiler
  4. New Heat Pump!

We use our vast experience so as to guide you through the correct boiler and boiler installation for your needs.

All of our Installations follow latest UK energy regulations

Over the last few years, the UK has passed several government guidelines for boiler installation and energy efficiency. These guidelines need to be followed. please remember:

  • Gas boilers should have at least a 92% ErP efficiency regardless of boiler type.
  • A Combi boiler installation should have one energy-saving feature.
  • Thirdly, you should have functioning time and temperature controls.

Finance for your heat only boiler…

Without a doubt, buying a new boiler and having a boiler installation or a heat pump, is an investment. However, it can be expensive. Especially paying for it all in one payment, which is why we offer some alternative options.

You can get the job done on a finance package that is FCA-approved if you don’t have enough money on hand.

Not to mention, we also offer a number of split payment options for you to consider.

Read more: Best Ground Source Heat Pumps and Prices?

Boiler Replacement Payment Options – heat only boilers

For new boiler installation, you can pay by card, pay zero deposit, and pay monthly over 2 to 10-years or use our a finance package as well.

So why Let’s Heat for your heat only boiler replacement?

A. Let’s Heat Are Quality & Accredited Boiler Installers

Chiefly, Let’s Heat professional engineers and emergency plumbers provide a professional and reliable emergency plumbing and heating service.

Our Coverage – heat only boilers

Our services include Boiler Installation and Heat Pump Installation, in Cardiff and the surrounding CF postcode areas of South Wales.

We also cover the rest of Wales and all of England (see below).

The installation & repair team are all fully qualified to the highest standards and take pride in our exemplary work standards. Undoubtedly, that includes completing all boiler installation requirements regardless of the time and day.

Qualifications & Accreditations:

our team of high-quality professional engineers has a high score of 4.9 out of 5 Trustpilot and we are fully accredited by Gas Safe and Corgi registered, as well as FCA approved for all of our financial transactions.


Above all, all of our staff at Let’s Heat are experts in their field and have gathered many years of experience. We have worked on a wide selection and variety of emergency plumbing and heating solutions and services throughout Cardiff, the rest of Wales & the UK.

B. Because we care…

Are you still a little confused about where to start or who to use?

Our easy-to-use online questionnaire will help through everything that you, and we, need to know in order to make sure that you have the correct solution for your needs.

We will also ensure that you are completely happy with the solution before completing any work.

Why else?

  • Firstly, we cover Cardiff and the surrounding areas of South Wales
  • Reliable, professional, and trustworthy
  • High Trustpilot score of 4.9 out of 5.
  • Gas Safe Accredited (corgi registered),
  • Our prices are very competitive
  • At any rate, our Finance is FCA accredited.
  • We ensure that your house is kept clean and tidy as well
  • All workmen use floor protection on each job
  • We always make sure your rubbish is correctly disposed of
  • The Service comes with a 12-month snag guarantee
  • In sum, we travel anywhere throughout the UK.

You can research your boiler replacement requirements and choose your new boiler and the boiler installation online, without leaving the house…

If you need a new combi boiler or heat pump and installation, please do not hesitate to reach out to our heating engineers team because they have more information to help you with.

We cover everything that you might need, including the full boiler replacement from us here at Let’s Heat.

Next Day Service – heat only boilers

We replace & install boilers and heat pumps nationwide and include next-day installation (on orders placed before 12/2 pm in all seasons.

All of our engineers are experienced and skilled in all aspects of heating installation services, repair and maintenance.

Alternatively, please take a look at our FAQS or blog, if you have any other questions because there are lots of questions answered in those places.

Best combi boilers & boiler brands

Full range of heating & plumbing services provided by Let’s Heat:

  • Boiler Repairs & Installations
  • Boiler Supply & Fit
  • Financing Your Boiler
  • Emergency Boiler Repairs & Installations
  • Emergency Boiler Supply & Fit
  • Plumbing Repairs
  • Bathroom Plumbing
  • Kitchen Plumbing
  • Emergency Plumbing Repairs
  • Bathroom Plumbing in Emergencies
  • Emergency Kitchen Plumbing
  • General Plumbing Services
  • Emergency Plumbing Services
  • Emergency Gas & Heating Engineer

Areas covered by our Boiler Replacement Services:

The Let’s Heat engineers cover all of Wales & England because they are willing to travel.


Let’s Heat provide Heat Only Boiler installations throughout Wales, including areas like; South East Wales, South Wales, South West Wales, Mid Wales, East Wales, West Wales as well as North Wales.

Welsh Cities:

This includes all of the Welsh cities like: Cardiff, Newport, Swansea, and all other towns and cities in Wales.


What’s more, Let’s Heat provide Heat Only Boiler installations  throughout England, including areas like; South West England, South East England, East Midlands, West Midlands, North West England, and North East England as well.

English Cities:

This includes all of the English cities such as: London, Reading, Southampton, Portsmouth, Bristol, Exeter, Plymouth, Gloucester, Swindon, Oxford, Leicester, Nottingham, Derby, Birmingham, Worcester, Wolverhampton, Walsall, Liverpool, Manchester, Leeds, York, Sheffield, Newcastle, Sunderland as well as Middlesbrough, etc.

Read more:

Worcester Bosch Greenstar 8000 Life Combi Boiler Review 

Best Air Source Heat Pumps and Prices


How long do heat only boilers last?

A good boiler should not only heat your home efficiently but also be able to do it for a long time. If you have newly bought a new boiler, you do not have to worry about getting a replacement for many years. Most modern boilers last for anywhere between 10 to 15 years on average.

What is the difference between a heat only boiler and a system boiler?

Heat only boilers (conventional or regular) work with a cylinder in the airing cupboard. System boilers are more than often found in modern homes with an ‘unvented’ hot water cylinder.

What does heat only mean?

A heat only boiler heats a home by using a cold water tank, a hot water cylinder, in addition to a feed and expansion tank. Heat only boilers are usually found in larger homes because they are able to supply hot water to multiple radiators, taps and showers all at the same time.

How long does it take to install a regular boiler?

A regular boiler can take between 1 to 3 days. The complexity of the installation will determine the duration. A like-for-like boiler replacement would be the quickest to do. However, replacing a different kind of boiler would take longer time to finish. For instance, a combi boiler replaced with regular boiler will require installing a hot water cylinder, a tank and re-routing the pipework. Lastly, moving your boiler would also increase the installation time.

Is a regular boiler the right choice for me?

To get what you exactly need, you should take a look at the pros and cons of regular boilers. There are a lot of things to think of when it comes to choosing the most suitable boiler for you. So here are some of the most important things to keep in mind:

How do regular boilers work?

It is all pretty simple. Basically, a regular boiler will take water from the tank to provide heating. It is important to place your tank as high as possible to have a better water flow in all the system.
A heat exchanger warms up the cold water once you turn on the hot tap or switch on the heating. After that the hot water moves to the hot water storage cylinder where it is kept and circulated. Then valves will direct hot water to the heating system or the taps and outlets.