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Last updated: 13 March 2024

35kW Boilers – Everything You Need to Know

35 kw boiler

If you’re looking to replace your boiler with a new 35kW boiler for your home, look no further. You can find and compare different boiler brands and boiler models with outputs of 35kW here in this article.

35kW boilers have a large and powerful output size meant for large homes with high heating and water demands (approximately 15-20 radiators). With that in mind, 35kW boilers are associated with system and conventional boilers because they use hot water cylinders to store a lot of hot water. Yet, there are still combi boilers with 35kW outputs.

We’ve compiled a list of system, combi, and conventional boilers with an output range of 35kW (kilowatts). They can all be a great addition to your home.

When it comes find to finding the best 35kW boiler installer, it can take several hours, if not days, to source the most suitable installers and get their quotes. It’s important to collect multiple quotes so you can learn the bets deals in your area.

To speed up this process while ensuring that you only receiving professional quotes, get your quotes from GreenMatch. Simply fill in the form then within 48 hours, you’ll hear directly from up to 4 licensed installers in your local area.

With up to 4 quotes, you can compare and choose the most competitive offer. All of our quotes are 100% free and come with no obligation.

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35kW System Boilers

A 35kW system boiler can provide direct central heating and hot water to your home with the help of a hot water storage cylinder. Installing a system boiler can be less complex and cheaper because they don’t need a cold water tank as they pull water from the mains.

They are a great match for homes with large heating demands. We’ve gone ahead and selected three 35kW system boilers for you to choose from that will fit your heating needs.

1. Vokèra Evolve S 35kW System Gas Boiler

Vokera evolve s35kW system gas boiler

The first system boiler we’ve selected is one of the A-rated gas boilers by Vokèra –a well-known brand in the boiler industry. This particular boiler is a wall-mounted, 35kW condensing boiler. It offers a good choice for medium-to-large homes looking for high energy efficiency

    • Efficiency: 94%
    • Central Heating Output: 35kW
    • Warranty: 7 years
    • Estimated price (excl. installation): £684 (incl. VAT)

2. Worcester Bosch Greenstar 8000 Life 35kW System Gas Boiler

Worcester Bosch Greenstar 8000 Life 35kW System Gas Boiler

Like the first system boiler we listed, this 35kW Worcester system boiler runs on gas and has high A-rated energy efficiency. This modern boiler offers modern features such as wireless compatibility with the Bosch EasyControl and the optional Intelligent Filling System that helps automatically monitor and adjust the boiler’s pressure.

    • Efficiency: 94%
    • Central Heating Output: 35kW
    • Warranty: up to 12 years
    • Estimated price (excl. installation): £1,357 (incl. VAT)

3. Grant Vortex Eco Utility 35kW System Oil Boiler

Grant Vortex Eco Utility 35kW System Oil Boiler

The last 35kW system boiler in this list is an oil-fired boiler manufactured by Grant. As an oil-fired boiler, the Vortex Eco Utility System has a lower energy efficiency than the other 35kW system boilers we listed. Yet, it makes up for it as it’s favoured by many engineers who rate it highly. It also has an award-winning condensing heat exchanger (Riello RDB burner) that can help lower the running cost.

    • Efficiency: 92.4%
    • Central Heating Output: 35kW
    • Warranty: up to 5 years
    • Estimated price (excl. installation): £1,875 (incl. VAT)

We’ve just researched and compared three 35kW system boilers for you here. But as you might have realised, there are many options to choose from and many installers offer different deals. With the right installer, you can get a good and competitive deal on a new 35kW boiler.

35kW Combi Boilers

If you’re a bit low on space in your home, we’ve found some 35kW combi boilers that can still meet your large heating demands. Combi boiler installation can be easy as they are known for being compact and don’t require any additional tanks to be installed. With a 35kW combi boiler you’ll have both a central heating output and a domestic hot water output.

Below you can see our three picks for combi boilers with a domestic hot water output of 35kW. All three combi boilers below are reviewed as being a “Best Buy” product by Which.

1. Worcester Bosch Greenstar 8000 Life 35kW Combi Gas Boiler

This 35kW Worcester Bosch combi boiler is made by one of the top UK boiler market leaders. The quality of Worcester Bosch boilers is recognised around the industry, and its 12-year parts and labour warranty makes it a safe purchase for your home. This particular 35kW Worcester boiler is a part of the manufacturer’s most powerful boiler range.

If you’re looking for a similar boiler, Worcester Bosch also has the Greenstar 8000 Style 35kW. It has similar features but comes in more styles and with more controls.

    • Efficiency: 94%
    • Central Heating Output: 35kW
    • Domestic Hot Water Output: 34.5kW
    • Warranty: up to 12 years
    • Estimated price (excl. installation): £1,610 (incl. VAT)

2. Viessmann Vitodens 200-W 35kW Combi Gas Boiler

Viessmann Vitodens 200-W 35kW Combi Gas Boiler

Our second option for combi boilers is a Viessmann 35kW combi boiler, also called a Viessmann 35kw combination boiler. Customers of the Viessmann Vitodens 200-W 35kW say they’re satisfied with the boiler and rate it highly for its long lifespan and Wi-Fi integration. So if you’re looking for a Viessmann 35kw boiler, this option can be an efficient choice for your home.

    • Efficiency: 94%
    • Central Heating Output: 32kW
    • Domestic Hot Water Output: 34kW
    • Warranty: up to 10 years
    • Estimated price (excl. installation): £1,320 (incl. VAT)

3. Vaillant ecoTEC plus 835 Combi Gas Boiler

Vaillant ecoTEC plus 835 Combi Gas Boiler

Vaillant’s ecoTEC plus combi boiler is another great option to meet your heating needs. This particular Vaillant combi boiler with 35kW delivers high performance, efficiency, and control. Out of all 35kW combi boilers, this Vaillant 35kW combi boiler is one of the highest rated ones by engineers who compliment its build quality.

    • Efficiency: 94%
    • Central Heating Output: 32.2kW
    • Domestic Hot Water Output: 35kW
    • Warranty: 10 years
    • Estimated price (excl. installation): £1,431 (incl. VAT)

The process of choosing a boiler model and boiler installer can be daunting as there are a lot of factors to consider –such as efficiency, warranty, and most of all cost. The cost of a new boiler with 35kW can vary depending on where you live and the installation complexity.

We can help you get competitive boiler quotes and reduce the risk of overpaying by connecting you with up to 4 boiler installers in your area from our network of trusted installers.

We make the process as easy as clicking a button and answering a few short questions about your home heating situation. In return, you get tailor-made boiler quotes for free. That’s way easier than calling multiple local installers individually!

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35kW Heat-Only Boilers

A heat-only boiler, also known as a regular or conventional boiler, is an older type of boiler that requires both a cold and hot water tank to supply heating and water to your home. Conventional boilers continue to find their place in many larger homes in the UK, making them an ideal choice for 35kW boilers.

Conventional boiler installations are more complex because they require cold water tanks and hot water cylinders. They’re typically only recommended if you already have a heat-only boiler. We’ve listed 3 of the options you have when choosing a 35kW heat-only boiler.

1. Worcester Bosch Greenstar 8000 Life 35kW Regular Gas Boiler

Worcester Bosch Greenstar 8000 Life 35kW Regular Gas Boiler

The Greenstar 8000 Life conventional boiler by Worcester Bosch is ideal for larger homes with more than one bathroom. It comes with wireless integration with a smart thermostat and a modern new design. As a 35kW Worcester system boiler, it is reliable, has a long warranty, and has been a favourite of homeowners for more than a decade.

    • Efficiency: 94%
    • Central Heating Output: 35kW
    • Warranty: up to 12 years
    • Estimated price (excl. installation): £1,546 (incl. VAT)

2. Vaillant ecoTEC plus 435 Regular Gas Boiler

Vaillant ecoTEC plus 435 Regular Gas Boiler

This 35kW Vaillant boiler is ErP A-rated for heating efficiency and has been given a “Best Buy” product award from Which. Its modern power-saving mode can reduce its power use by 86% helping you save on fuel and money. Consider this 35kW Vaillant boiler if you’re looking for a highly rated premium boiler for your large home.

    • Efficiency: 93%
    • Central Heating Output: 35.1kW
    • Warranty: 5 years
    • Estimated price (excl. installation): £1,453 (incl. VAT)

3. Grant Vortex Boiler House 35kW Regular Oil Boiler

Grant Vortex Boiler House 35kW Regular Oil Boiler

The final 35kW heat-only boiler on our list is the Vortex Boiler House oil boiler manufactured by Grant. As an oil boiler, it is an efficient option if you’re not connected to the gas grid. It is a standing, 35kW condensing boiler that is known for being durable.

    • Efficiency: 94.6%
    • Central Heating Output: 35kW
    • Warranty: 5 years
    • Estimated price (excl. installation): £2,045 (incl. VAT)

It’s good to consider that the prices we’ve included for each 35kW boiler on this page are only estimates. Your local boiler installer can quote you a different price depending on where you live and the installation complexity.

Because prices can vary, the best strategy we recommend is to compare quotes from multiple boiler installers. By comparing quotes from multiple installers you can ensure you’re not overpaying.

The typical way to find multiple installers is by painstakingly calling them one by one and spending hours re-explaining your heating situation to each of them. If you want to skip this tedious and long process, just click the button below and answer some short questions about your heating demands. In return, we’ll give you free comparison quotes from up to 4 installers in much less time than it takes to call the installers in your local area.

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Hannah Maza
Written by Hannah Maza, Writer

As a writer with a deep understanding of low-carbon energy systems, Hannah aims to breakdown knowledge barriers and share insights to empower individuals in their pursuit of creating more environmentally conscious homes.

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