Best 30kw Combi Boilers for 2024 Review

James Elston
Written by James Elston
Updated on 2nd January 2024
Posted on 1st January 2024
Best 30kw Combi Boilers for 2023 Review

Which is the best 30kW combi boiler for homes in the UK?

This expert guide and article aims to present the top 30 kW combi boilers that are highly sought after by homeowners with average heating and hot water requirements.

These best combi boilers offer a compact and efficient replacement boiler for both heating and hot water supply without the need for hot water tanks.

To help you make a well-informed decision, we will be comparing the best 30 kW combi boilers based on factors such as efficiency, reliability, and cost, so whether you’re looking to install a new combi boiler system or upgrade your current one, this guide will provide you with all the necessary information.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

What are the best 30kW combi boilers?

If you want to know which is the best 30kw combi boiler straight away, these are the contenders who made our shortlist:

Rank30kW boiler
1stViessmann Vitodens 050-w 30kW
2ndWorcester 4000 30kW
3rdWorcester Bosch Greenstar 8000 Style 30kW
4thWorcester 2000 30kW
5thIdeal Logic C30 30kW

So before we take a closer look at our top five best gas combi boilers, let’s first decide if a 30kW boiler is the right choice for your home.

Combi boiler benefits

  • Reducing space: Combination boilers free up important rooms in your house by doing away with the requirement for a separate hot water tank
  • Cost-effective: If you don’t currently have a boiler, then it will be cheaper to install a new combi boiler rather than one with a hot water tank as well.
  • Excellent efficiency: Combi boilers of the modern era are extremely energy-efficient, needing less to provide both heating and hot water.
  • Due to not having to wait for your hot water tank to refill, a combi boiler provides you with instant hot water and an endless supply of it, whenever you need it.
  • Combi boilers often require less plumbing and storage tanks than classic heating systems, making them easier to install.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

How do you decide if a 30kw combination boiler is right for your home?

The best 30kw combi boiler decision is based on various factors such as:

  1. Home heating and hot water requirements
  2. Boiler size and capacity
  3. Energy efficiency rating
  4. Boiler brand reputation and reliability
  5. Price and budget
  6. Warranty and after-sales support
  7. Space and location for installation
  8. Professional assessment and recommendation.

It’s important to consider all these factors, and compare several options before making a final decision, as if a combi boiler is not suitable then you may need to consider a system boiler.

Would your home benefit from a 30kW boiler?

The size of the boiler needed for a house depends on several factors, including:

  1. The home’s size
  2. The number of bathrooms/ showers
  3. Number of radiators
  4. The hot water demand
  5. How much insulation there is
  6. The environment and local weather.

A 30kW boiler may be suitable for a small to medium-sized house with a few radiators and basic hot water demand. However, without a detailed assessment of your heating and hot water requirements, it is difficult to determine the appropriate size of the boiler.

The Best 30kW Combi Boilers

1st Viessmann 050-W 30kW combi boiler

Like most Viessmann boilers, the Viessmann 050-W 30kW combi boiler is a compact, high-performance appliance that provides both heating and hot water for your home.

This Viessmann combi boiler features a modern design and advanced technology for efficient, reliable operation. Available with a 30kW heating output, this boiler is suitable for medium sized homes with up to 2 bathrooms.

Viessmann 050-W 30kW Key features include:

  • Compact design for easy installation
  • High efficiency for lower energy bills
  • Modulating heating output to adjust to your changing needs
  • Equipped with the Inox-Radial stainless steel heat exchanger
  • Intelligent control system for easy operation and maintenance.
  • Suitable for homes with multiple bathrooms.

What is a stainless steel heat exchanger?

The boiler features an inox radial stainless steel heat exchanger, which ensures the efficient and reliable operation of the central heating system. These two key components play a vital role in ensuring your boiler runs smoothly.

take a look at our in-depth Vitodens 050 review here

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

2nd Worcester 4000 30kW combi boiler

The Worcester 4000 30kW combi boiler is a wall-mounted gas boiler that can heat and supply hot water to smaller houses and apartments. It is a good choice for homes with little space because of its A-rated energy efficiency and compact design.

For individuals who desire a single appliance to supply both heating and hot water, the boiler’s small size and adaptable performance make it an affordable option.

The user-friendly heating controls and simple installation of the Worcester 4000 30kW combi boiler make it a sensible option for homeowners and renters. The boiler is made by Worcester Bosch, a well-known company that is renowned for manufacturing durable, high-quality boilers.

Worcester 4000 30kW key features:

  • Hydrogen-ready
  • Suitable to use with Worcester Bosch products and heating controls, including Hive and Nest
  • Quiet operation
  • 10 year warranty
  • Easy access to maintenance is provided through removable side panels.
  • A wonderful option for small to medium-sized homes

read more about the Greenstar 4000 30kw boiler in our review

3rd Worcester Bosch Greenstar 8000 Style 30kW combi boiler

The Worcester Bosch Greenstar 8000 Style boasts dimensions of 400mm x 780mm x 365mm, making it a larger unit. Its stylish design allows it to blend in seamlessly with your decor, and it comes in both black and white options to match your preference.

With a modern and sleek look, it resembles more of a high-tech device than a boiler, making it a stylish addition to any home. The easy-to-install, lightweight design eliminates the need for hiding it away in a kitchen cupboard. If a more compact boiler is desired, consider the Worcester 4000 Combi.

Worcester Bosch Greenstar 8000 30kw key features:

  • Ideal for bigger homes with multiple bathrooms or extensive radiators/underfloor heating.
  • It’s part of the brand’s Style range which places a strong emphasis on design.
  • It offers the same features as the Life range, including power options of 30kW, 35kW, 40kW, 45kW and 50kW, allowing you to choose the best combi boiler fit for your home.
  • With the highest water flow rate among wall-mounted combi boilers, it’s capable of efficiently heating large homes and those with two or more bathrooms.
  • The intelligent filling system ensures the correct pressure without manual intervention, and it’s also one of Worcester Bosch’s quietest boilers.

See more about the Greenstar 8000 30kw here.

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

4th Worcester 2000 30kW combi boiler

The Greenstar 2000 combi boiler is a popular solution for flats and apartments as it is Worcester Bosch’s entry-level boiler.

This small size combi boiler is loved for its silent operation. It contributes significantly to its amazing fit for small living spaces. This shows that the living room or bedroom won’t be hampered by installation.

In fact, the Worcester 2000 makes so little noise that it is recognised as a Quiet Mark product.

With Bosch EasyControl compatible

Controlling your heating is really easy using Bosch EasyControl. This wireless device lets you set heating settings and change the temperature using an app on your smartphone.

Worcester 2000 30kW Key Features include:

  • High levels of efficiency: The Worcester 2000 has an efficiency rate of 93%.
  • It is an ErP A-rated combi boiler for heat and hot water.
  • The 2000 30kW boiler is covered by a warranty from Worcester Bosch for up to 10 years.
  • 5 years is the standard warranty.
  • Whenever a Greenstar System Filter is installed, 6 years
  • 8 years after installation from Boiler Central

Like this budget boiler? See why we like it too here.

5th Ideal Logic C30 30kW combi boiler

For those searching for a dependable and effective heating solution for their homes, the Ideal Logic C30 30kW combi boiler is a popular option. It is a little boiler that doesn’t take up much room, making it a wonderful solution for people who are space-constrained.

The C30 has a user-friendly interface and is straightforward to instal, making it easy to use. A speedy and reliable supply of hot water is ensured by the boiler’s high flow rate. The C30 has a high rating for efficiency and is renowned for being economical to use.

The Ideal Logic C30 30kW combi boiler is, all things considered, a wise choice for individuals searching for a reasonably priced, effective, and small heating solution.

The Ideal Logic C30 is an affordable combi boiler designed for use in residential properties. It is a wall-mounted unit that combines the functions of a central heating boiler and hot water heater into one compact unit, eliminating the need for a separate hot water storage tank.

Ideal Logic C30 30kW key features include:

  • Integrated frost protection – one of the things we particularly enjoy about the Ideal C30 is the built-in frost protection. As a consequence, there is no need to worry if the cold weather might cause boiler problems.
  • Energy efficiency – The C30 uses less energy and is less expensive thanks to its 94% efficiency rating.

Outstanding achievement – It has also won a Queen’s Award and two Good Housekeeping Awards. Additionally, the Energy Saving Trust supports it.

Read more on the Logic c30 here

Get an online fixed price in 20 seconds:

What kind of fuel does your boiler use?

30kw Combi Boiler Replacement

A new 30kW combi boiler can be a good choice, however, the actual power output you require will depend on your specific heating and hot water needs. It’s important to consider factors such as the size of your home, the number of bathrooms, and your average daily hot water usage before deciding on a new combi boiler.

Best 30kw combi boilers to buy in 2024: Summary

All of the previous boilers may be useful to homes in 2024, but the Worcester Bosch 4000, a powerful boiler, is our winner. It stands out from the competition thanks to its superior performance and design, and its high-efficiency performance ensures that it can supply heating and hot water in an energy-efficient manner.

The Worcester Bosch 4000 is easy to instal and use since it has a user-friendly digital display and is compatible with a variety of heating settings, whilst being a reliable and reasonable choice due to its quiet operation and built-in frost protection.

The Worcester Bosch 4000 is one of the most modern boilers available in 2024, making it an intelligent purchase for people seeking a dependable and efficient gas boiler replacement heating option.


What is a 30 kW combi boiler?

A 30 kW combi boiler (combination boiler) is a central heating and hot water system that combines both functions in one unit. It has a heating output of 30 kW.

If you’re looking for more powerful combi boilers, please see our 50kW boilers page.

What size property is a 30 kW combi boiler suitable for?

A 30 kW combi boiler is suitable for properties with 1-2 bathrooms and up to 10 radiators.

How much does a 30 kW combi boiler cost?

The cost of a 30 kW combi boiler can range from £700 to £2,500, depending on the combi boiler brands and model. Read our price guide for boilers here.

The costs associated with installing a new 30kW combi boiler typically include:

  1. Boiler cost: The cost of the boiler itself, including the price of the unit and any additional features or accessories.
  2. Installation cost: The cost of labour to install the boiler, including the time and materials required to complete the installation.
  3. Pipework: The cost of any new or replacement pipework that is needed for the installation.
  4. Building regulations: Any costs associated with obtaining building regulations approval for the installation.
  5. Removal of old boiler: The cost of safely removing and disposing of the old boiler.
  6. Miscellaneous materials: The cost of any additional materials or fittings that are required for the installation, such as a flue or expansion tank.
  7. Warranty: The cost of any extended warranty or after-sales support that is required.

It is important to consider all of these costs when planning and budgeting for a new combi boiler installation.

The cost of running a boiler depends on several factors such as:

  1. Fuel type and cost (e.g. natural gas, propane, oil, electricity)
  2. Boiler efficiency
  3. Size of the boiler
  4. Number of hours of operation
  5. Climate and regional energy costs

Some common expenses include fuel, maintenance, and repair costs. To reduce costs, it’s recommended to regularly maintain the boiler, upgrade to one of our best 30kw energy efficient combi boilers, and use energy-saving practices.

Is a 30 kW combi boiler more energy efficient than a traditional boiler?

Yes, a combi boiler is more energy efficient than a traditional boiler as it can only heat water on demand, rather than continuously heating and storing hot water in a cylinder.

What are the benefits of a 30 kW combi boiler?

Benefits of a 30 kW combi boiler include energy efficiency, space-saving design, hot water on demand, and elimination of the need for a hot water cylinder.

Can a 30 kW combi boiler be used with solar panels?

Yes, a 30 kW combi boiler can be used with solar panels to provide hot water and heating, potentially reducing energy costs.

What are the best boiler brands for combi boilers?

The best boiler manufacturers/brands for combi boilers are as follows:

  • Worcester Bosch: known for their high efficiency ratings and reliability.
  • Vaillant: known for its user-friendly interfaces and energy efficiency.
  • Baxi: known for their affordability and good customer reviews.
  • Ideal: known for their compact design and cost-effectiveness.
  • Viessmann: known for their innovative technology and high-quality products.

These brands have established themselves as leading providers of combi boilers by the most reliable combi boilers on the boiler market. Most of their modern combi boilers offer high performance, efficiency, dependability, and customer satisfaction. Remembering that the best brand for a certain person will rely on their own demands and tastes is extremely important.

How long does a 30 kW combi boiler last?

The lifespan of a 30 kW combi boiler is typically 10-15 years, with proper maintenance and annual service.

Written by
James Elston
James Elston Director Of Boiler Central
Posted on: 1st January 2024

James Elston is our resident boiler replacement and heating expert here at Boiler Central. With over 20 years experience in the boiler installation industry, James ensures that he knows everything there is about our Gas Safe boiler installations, energy saving and home heating solutions. This can be from simply procuring the latest best combi boilers, to reviewing and ensuring that Boiler Central maintains the highest standards across our boiler installation company.

Buy a combi boiler online today!

Instant online quotes. Nationwide next-day fitting

Get my fixed price
Get a great price on a Which? Best Buy boiler online in 20 seconds
  • Over 15,000 boiler installed
  • Rated Excellent on Trustpilot
  • Fair, fixed and final prices
  • No pushy salespeople
  • Next-day installation
  • 0% deposit interest-free finance
Next-day fitting available until 2pmGet a quote now >