Best Boiler for a 4 Bedroom House In The UK 2025

If you’ve recently bought a home or your current boiler has stopped working, it’s time to consider purchasing a new boiler.

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While larger homes with high hot water demands used to rely on system boilers and combi boilers were only considered for smaller homes, things have changed.

Nowadays, combi boiler replacements are often the preferred choice for homes of various sizes because they can reduce energy consumption, lower your energy bills, and reduce your carbon footprint. 

Best Boilers for Homes with 4 Bedrooms – Our Picks

So what is the best boiler for a 4-bedroom house with 1 bathroom? Keep reading for a rundown of our top new boilers, how to choose the best one for you, and other gas boiler questions you may have in mind.

If you have 2 bathrooms in your home, then find our best boilers for large homes here.

Our Top Picks:

• Worcester Bosch Greenstar 8000 Style
• Viessmann Vitodens 100-W
• Alpha E-Tec Plus
• Ideal Logic Max
• Vaillant ecoTEC Plus
• Viessmann Vitodens 200-W

What Size Boiler Do You Need For A 4-Bed House?

For a 4-bedroom house, you’ll typically need a boiler with an output between 28kW to 35kW. The exact size depends on factors like the number of bathrooms, radiators, insulation, and overall hot water demand. 

A 28-30kW boiler usually suffices for a well-insulated 4-bed home with one bathroom, while 35kW might be necessary for less efficient houses or those with multiple bathrooms.

How many kW does a boiler need for a 4-bedroom house?

House Size	Bedrooms	Radiators	Bathrooms	Combi Boiler (kW)	System Boiler (kW)	Regular Boiler (kW)
Small	1-2	Up to 10	1	24-27	15-18	15-18
Medium	3-4	10-15	1-2	28-34	18-26	18-26
Large	4-5	15-20	2-3	35-42	26-40	26-40
Very Large	6+	20+	3+	43-50+	40-50+	40-50+

Which Is The Best Type Of Boiler For A 4-Bedroom House?

When choosing a boiler for a 4-bedroom house, you have three choices: a gas combination boiler, a system boiler, or a conventional boiler.

Each type has its advantages, but your decision will be influenced by the size of your home’s central heating system, hot water demands, and boiler efficiency.

A combi boiler can be a great choice if you choose the right size for your home. They’re incredibly efficient in heating water on demand, which can help reduce energy costs and avoid wasting hot water.

Best Combi Boilers For A 4-Bedroom House

The best combi boiler for a 4-bedroom house is a large, reliable, and powerful system that can meet the higher hot water demand. The best part is that a new combi boiler costs less than you might think.

If you aren’t sure what new boiler to choose for your home, we’ve provided an overview of our top choices below.

If you have a home with 3 bedrooms or a 2-bedroom home, check out our other, less powerful combi boilers that will be better suited to your needs.

Boiler Make	Model	Efficiency Rating	Warranty	Boiler Price	Price with Installation
Worcester Bosch	Greenstar 8000 Style 35kW	94%	Up to 12 years	£1,770 – £2,180	£2,770 – £3,680
Viessmann	Vitodens 100-W 35kW	94%	Up to 10 years	£1,280 – £1,580	£2,280 – £3,080
Alpha	E-Tec Plus 38kW	93%	Up to 13 years	£1,100 – £1,400	£2,100 – £2,900
Ideal	Logic Max C35	94%	Up to 10 years	£1,130 – £1,670	£2,130 – £3,170

Worcester 8000 35kW combi boiler

Overview

The Worcester 8000 35kw combi boiler is a great choice for larger homes as it might not fit in standard kitchen cupboards due to its size.

While combi boilers are more compatible with small homes, the Worcester 8000 has a greater capacity and can effectively heat homes with four bedrooms and more than one bathroom.

This boiler comes with a range of features and a 12-year warranty for peace of mind.

Features

The Worcester 8000 35kW boiler offers excellent connectivity and style. It’s designed to integrate into different home interiors and sizes and provides more convenience thanks to its smart technology.

• Guarantee: The boiler provides a Worcester Bosch max guarantee of 12 years.
• Intelligent Filling System: Works well in larger homes with more bathrooms.
• Wireless: Uses wireless connectivity with a smart thermostat.
• Colour: Available in black or white to suit your home’s style.
• Easy to use: Has a full-colour boiler display.
• Quiet: Even though it’s powerful, it is one of Worcester’s quietest boilers to date.

Why choose this boiler?

There are many excellent reasons to choose the Worcester 8000. It’s energy-efficient, powerful for its size, and delivers hot water quickly.

All of that makes it a great pick for a 4-bedroom home or a larger property.

Viessmann Vitodens 100 35kW combi boiler

Overview

The latest Viessmann Vitodens 100-w boiler is innovative quiet, and affordable. Not only is it both compact and powerful, but it also contains a range of features not found in competing models. These include internet integration, high-level efficiency, and user-friendly LCD touchscreen technology.

This boiler comes with a maximum 12-year warranty, which includes boiler replacement. You will receive a highly functional boiler with built-in Wifi for use with a smart thermostat.

Features

If you want an innovative design with quiet and efficient functionality, you’ll love the excellent features provided by Viessmann. This system is perfect for homes of different sizes and usages.

• Unique: Compact and innovative design.
• Less noise: Low fan speed offers quiet operation.
• High-quality: Features an Inox-Radial heat exchanger.
• Environmentally friendly: Reduced Co2 emissions.
• Easy to use: User-friendly LCD touch screen with integrated wifi interface.

Why choose this boiler?

The Vitodens 100 uses the latest boiler technology to increase efficiency and reduce energy usage by converting more fuel into heat. It has low eco-impact and low Co2 emissions. Plus, it’s convenient that you can get this brand new boiler on finance to help spread the cost over 2 or more years.

Alpha E-Tec 38kW combi boiler

Overview

The Alpha E-Tec 38kw combi boiler is another excellent choice for larger homes.

The boiler uses pipes made from corrosion-free materials and incorporates other high-quality internal components that make it more efficient and durable. Its robust construction is backed by an impressive 13-year max guarantee.

Features

One of Alpha E-Tec’s stand-out features is that a new boiler comes with a warranty of up to 13 years. Many of our customers are unaware of this extensive coverage, which speaks to the boiler’s longevity and quality. 

• Corrosion-resistant: Uses a stainless steel heat exchanger, copper pipe and isolation valve, and zinc-plated expansion vessel.
• Efficiency: Includes a high-efficiency pump and combined condensate and pressure relief valve.
• Easy to use: Easy access to the front of pipes and a user-friendly control panel.

Why choose this boiler?

If you’re looking for a long-lasting, user-friendly, and efficient combi boiler, consider the Alpha E-Tec. It’s not only capable of efficiently heating a large four-bedroom home but it’s also made from durable, corrosion-free materials that are guaranteed to last for at least ten years.

Ideal Logic C35 combi boiler

Overview

The Ideal Logic C35 boiler is suitable for larger homes and a range of styles. With a 35kw output, it can efficiently heat a four-bedroom home. It’s durable, easy to install, and has a modern LCD interface for easier control and monitoring.

Features

Combining the latest technology with quality materials, this high-efficiency boiler is lightweight, robust, and perfect for larger homes.

• Output: 35kW maximum hot water cylinder for central heating and 24kW maximum central heating output.
• Corrosion-resistant: Heat exchanger made from aluminium silicon helps prevent corrosion.
• Warranty: 7-year manufacturer’s warranty.
• Easy to use: LCD Display and low lift weight.

Why choose this boiler?

If you need a reliable, highly efficient boiler for your home, the Ideal Logic C35 fits the bill. This compact combi boiler is stylish and easy to install and can heat a larger home without wasting water and energy.

Best System Boilers for a 4-Bedroom House

The best system boiler for a 4-bedroom house typically falls within the 35-40kW range to meet heating and hot water demands. Popular options include:

• Worcester Bosch Greenstar 8000 Style: While primarily mentioned as a combi boiler, this model is also available as a system boiler. It features built-in WiFi and offers high energy efficiency with up to 12 years of warranty on parts and labour.
• Vaillant ecoTEC plus: This system boiler, renowned for its German engineering, offers long-lasting performance and high efficiency. Despite its power, it’s relatively compact and can fit in a standard kitchen cupboard. It can be controlled remotely via the sensoAPP and comes with a warranty of up to 10 years.
• Viessmann Vitodens 200-W: Designed for ultra-quiet performance, this boiler boasts a 94% efficiency rating and has been voted a Which? Best Boiler. It features a large, user-friendly display and can be controlled via smartphone or tablet using the ViCare app. The warranty can be extended for up to 12 years.

All three of these system boilers are also available as regular (heat-only) boilers.

How to Choose the Right Boiler for Your 4-Bed Home

A new boiler is a big investment, so consider the following factors before making a final decision.

Boiler Type

• Combi boilers: Ideal if you’re short on space and your hot water needs are moderate. They heat water on demand, so no need for a separate tank.
• System and regular boilers: Great for homes with high hot water demand. They use a separate hot water tank, which means you can have hot water instantly and run multiple taps at once without losing pressure.

Boiler Size (kW)

A 35-40kW boiler is typically suitable for a 4-bedroom house. Larger homes with more bathrooms may need a system boiler for a consistent hot water supply.

Efficiency

Higher efficiency means lower energy bills, so look for A-rated boilers with 90% efficiency or higher. This means they convert at least 90% of the fuel they use into heat.

Price

Expect to pay between £2,000 and £3,500 for the boiler itself. Installation costs are extra, usually £500 to £1,500, depending on the complexity of the job. Remember, a more expensive boiler might save you money in the long run if it’s more efficient.

Warranty

Look for a boiler with a comprehensive warranty of 7-10 years. Some brands offer warranties extendable for up to 12 years. Longer warranties indicate that the manufacturer has confidence in their product’s quality and durability.

Installation Requirements

Check if your current system is compatible with the new boiler you’re considering. For system boilers, make sure you have space for a hot water cylinder. A professional survey can help avoid installation complications.

FAQs

What’s the difference between a combi boiler and a system boiler?

Combi boilers are compact systems that heat water when it’s required rather than slowly heating water in a hot water tank, which saves energy.

System boilers use a large hot water cylinder that is slowly heated and used throughout the day. While this ensures a ready supply of hot water, it can waste energy if the stored water isn’t used and cools down.

How many kWs does it take to heat a 4-bedroom house?

The number of kilowatts needed to heat a house depends on its size and the number of radiators.

A small flat with a few radiators requires between 12-24Kw to heat, but for a 4-bedroom house, you’ll need a medium combi boiler with an output of 24-30Kw. Typically, the more radiators you need, the harder the combi boiler has to work.

Where can I get an accurate quote for a new boiler?

You can get an accurate quote for a new boiler at Boiler Central.

Just answer a few questions about your home and we’ll give you a quote for the right type of boiler in seconds. We offer next-day nationwide delivery and zero deposit required on all our new boilers – not to mention great warranties you won’t find anywhere else. Get in touch with us today and make changing your boiler simple!

Final Thoughts

Whether you prioritise energy efficiency, space-saving design, or high hot water output, there’s a boiler to suit your needs. While this guide provides a solid starting point, every home is unique. What works for one 4-bedroom house might not be ideal for another, so reach out for a quote, and we’ll help you choose a boiler that keeps your home warm, your showers hot, and your energy bills in check.