Benefits of a Combi Boiler, Pros, Cons & Installation Guide 2024

Are you considering upgrading your home’s heating system but unsure which type of boiler to choose?

Combi boilers have become increasingly popular in the UK, offering efficiency and convenience in one compact package.

In this blog post, we’ll explore the benefits of a combi boiler, compare them to conventional boilers, and provide guidance in making the right choice for your home.

Get ready to discover how a combi boiler can revolutionise your heating experience and save you money in the long run.

Our Combi Boiler Guide Summary

• Combi boilers offer efficiency, space-saving convenience and instant hot water on demand.
• It is important to consider the effect of mains water pressure on combi boilers as low pressure can cause problems with hot water supply.
• Upgrading to a combi boiler can provide increased efficiency, space savings and instant hot water supply for many homeowners’ needs.

Read more about replacement boilers here in our guide

What are the Benefits of installing a combi boiler?

A combination boiler, or combi boiler, is a stand-alone heating system that functions as both a water heater and a central heating system in a single, compact unit.

In comparison to conventional boilers, which require a separate hot water cylinder and cold water supply tank, combi boilers heat water directly from the mains, providing hot water and central heating on demand.

This means that when you turn on a hot water tap, a combi boiler instantly heats the cold water, eliminating the need for a hot water storage tank.

Combi boilers work by simply turning your tap or heating on. Therefore, they have become the go-to choice for many UK homeowners due to their numerous advantages over conventional boilers.

However, they also come with some limitations that may make them less suitable for certain situations.

In the following sections, we will dive deeper into the advantages and disadvantages of combi boilers, helping you make an informed decision when it comes to selecting the best heating system for your home.

Advantages of Combi Boilers

There are several reasons why combi boilers have become a popular choice among homeowners. Let’s explore some of the key benefits that make combi boilers stand out from conventional and system boilers.

One of the main advantages of combi boilers is their space-saving design. Unlike conventional and system boilers, these compact combi boilers do not require separate hot water.

High Efficiency

One of the main reasons homeowners choose combi boilers is their impressive efficiency rating.

With an industry-standard efficiency rating of 90-94%, combi boilers outperform conventional boilers and older heating systems, which can devote around 55% of their energy to central heating.

This means that combi boilers can save you a considerable amount of money on your annual heating bills by wasting less energy as they heat water more efficiently.

Moreover, combi boilers come equipped with boiler modulation technology, which allows them to adjust their output to match the heating demand of your home, further increasing their efficiency and reducing energy waste.

This means that your combi boiler will only consume the energy it needs to heat your home, making it an eco-friendly and cost-effective option for heating and hot water.

Compact Size

Another advantage of combi boilers is their compact size. Unlike conventional boilers that require a separate hot water cylinder and cold water storage tank, combi boilers integrate all of their components into a single, compact unit, which can easily fit within a standard kitchen cupboard.

This eliminates the need for additional storage space and allows you to free up valuable space in your home for other purposes, such as a new airing cupboard or extra storage.

Furthermore, the absence of a cold water storage unit means that there is a lower risk of pipes freezing during the chilly British winter months, as there are fewer external components to be affected by the cold.

With a combi boiler, you can enjoy the benefits of a more efficient heating system while also saving space in your home.

Read more – How to hide a combi boiler in your home

Instant Hot Water Supply

Combi boilers have a unique feature that sets them apart from conventional boilers: their ability to provide instant hot water on demand.

When you open a hot water tap, the combi boiler heats the cold water directly from the mains, eliminating the need for a hot water storage tank.

This means that you’ll never run out of hot water as long as the boiler is functioning properly.

This on-demand hot water supply is particularly beneficial for busy households, where multiple people may need hot water at the same time.

With a combi boiler that heats water instantly, you won’t have to wait for the hot water tank to refill and reheat, ensuring that everyone in your home has access to hot water when they need it.

This convenience is just one more reason why combi boilers, also known as combination boilers, are a popular choice among homeowners.

Easy installation

Installing a combi boiler is generally easier and more cost-effective than installing a conventional boiler, thanks to their compact design and fewer external components.

Since combi boilers don’t require a separate hot water cylinder or cold water storage tank, the boiler installation process is more straightforward, which can save you both time and money.

Combi boilers are designed to be put in tight spaces; therefore, hiding a combi boiler in a cupboard or installing a combi boiler in a bathroom is ideal.

Cheap to maintain

In addition to the initial installation savings, combi boilers also have fewer components and pipes to maintain and repair, which can lead to lower ongoing maintenance costs.

Moreover, due to the popularity of combi boilers, there is an ample supply of affordable and readily available replacement parts, making it easier to find the components you need for boiler repairs or upgrades.

All of these factors combine to make combi boilers an attractive option for homeowners looking to upgrade or replace a boiler and central heating system.

Boiler Modulation technology

Boiler modulation technology is a key feature of combi boilers, allowing them to adjust their output based on the heating demand of your home.

This means that the boiler can decrease its maximum output to its minimum output, depending on the heating needs of your home, which enhances efficiency and minimizes energy waste.

This boiler modulation technology not only helps reduce your energy bills but also contributes to a more eco-friendly heating system, as it ensures that your combi boiler only consumes the energy it needs to heat your home.

With boiler modulation technology, you can enjoy a comfortable and efficient heating experience while also doing your part to reduce your carbon footprint.

Built in Wifi

Many modern combi boilers come with built-in WiFi, offering you the convenience of remote control and monitoring through your smart devices.

With a WiFi-enabled combi boiler such as the Viessmann Vitodens 050-w, you can manage your heating system from any location, allowing you to adjust the temperature to suit your needs and preferences, even when you’re away from home.

In addition to providing convenience, the built-in WiFi connectivity can also help with energy management.

Some combi boiler apps can detect component faults and automatically alert an engineer, ensuring that any issues are quickly addressed and resolved.

This smart thermostat technology compatibility adds another layer of benefits to combi boilers, making them an even more attractive choice for homeowners.

Disadvantages of Combi Boilers

While combi boilers offer numerous benefits, they also come with some limitations that you should consider before deciding if a combi boiler is the right choice for your home.

For example, combi boilers are not suitable for larger households that require a lot of hot water at the same time.

They also require a higher initial investment than other types of boilers, and may not be suitable for homes with low water pressure.

Read our guide on combi boiler vs system boiler for a more in depth look as to why.

Meeting High Hot Water Demand

One of the primary limitations of combi boilers is their ability to meet high hot water demand in larger homes with multiple bathrooms.

Since combi boilers heat water directly from the mains as it is needed, they may struggle to provide a consistent supply of hot water to multiple fixtures simultaneously.

In such cases, a conventional or system boiler might be a more suitable choice, as they can store hot water and deliver it to multiple bathrooms at the same time.

However, there are solutions for homeowners who prefer the benefits of a combi boiler but have higher hot water demands.

Storage combi boilers, which combine the advantages of a combi boiler with a built-in storage tank, can provide a reserve of hot water that can be accessed concurrently, ensuring consistent pressure and temperature.

Water Pressure Considerations

Mains water pressure can affect the performance of combi boilers, potentially leading to issues with hot water supply in some homes.

In cases where the mains pressure is low, the combi boiler may experience low pressure, causing the system to shut off and prevent hot water supply.

This can be particularly problematic if you have multiple bathrooms or if you rely on your combi boiler for both heating and hot water.

If low water pressure in your boiler is a consistent issue in your home, it is advisable to consult a professional plumber to inspect your boiler and system to determine the cause of the problem and recommend a suitable solution.

In some cases, installing a booster pump or upgrading to a system boiler may be a viable option to address water pressure issues.

Benefits of storage combi boilers

If your home has a higher hot water demand, a storage combi boiler may be the ideal solution for you. Storage combi boilers combine the benefits of a combi boiler with an integrated storage tank, providing a reserve of hot water that can be accessed concurrently and users will experience the same pressure and a consistent temperature.

This makes storage combi boilers an excellent choice for larger homes or households with multiple bathrooms, where hot water demand may be higher than what a standard combi boiler can provide.

By choosing a storage combi boiler like the Viessmann Vitodens 111-w, you can enjoy the efficiency, convenience, and compact size of a combi boiler while also meeting your home’s hot water needs.

Comparing Combi Boilers to Conventional Boilers

When deciding between a combi boiler and a conventional boiler, it’s essential to consider your home’s size, hot water demand, and existing heating system.

In general, combi boilers are more efficient, compact, and convenient than conventional boilers and changing from a conventional boiler to a combi is very popular for homeonwers in the UK.

They heat water directly from the mains, eliminating the need for a hot water storage tank, and are simple to install and maintain. The best combination boilers in 2024 can also save you up to £800 per year on heating bills compared to conventional boilers.

However, combi boilers may not be suitable for larger homes with high hot water demand, as they can struggle to provide a consistent supply of hot water to multiple fixtures simultaneously.

In such cases, a conventional or system boiler may be a more suitable choice.

Ultimately, the decision between a combi boiler and a conventional boiler will depend on your specific needs, preferences, and budget.

Top Combi Boiler Brands and Models

When choosing a combi boiler, it’s important to consider the top brands and models available to ensure you get the best quality and performance for your investment.

Leading combi boiler brands and models include Baxi, Ideal, Vaillant, Viessmann, and Worcester Bosch. These brands offer a range of options for different home sizes and budgets, providing you with the flexibility to find the perfect combi boiler for your needs.

When selecting the best combi boiler for your home, consider factors such as price, warranty, efficiency, and manufacturer reputation. By comparing the different brands and models, you can make an informed decision and choose the combi boiler that offers the best value and performance for your home.

Making the Right Choice: Combi vs. Conventional Boiler

Choosing between a combi boiler and a conventional boiler will ultimately depend on your home’s size, hot water demand, and existing heating system.

Combi boilers are generally more suitable for smaller homes with lower hot water demand, as they are more efficient, compact, and convenient than conventional boilers.

However, if your home has multiple bathrooms or requires a constant supply of hot water, a conventional boiler may be a better option.

Before making a decision, consider the advantages and disadvantages of both types of boilers, and consult with a professional heating engineer to determine the best option for your home.

By carefully weighing your options and considering your specific needs, you can choose the right boiler that will provide efficient and reliable heating and hot water for years to come.

Why are combi boilers the best option?

Combi boilers are an excellent choice for many homeowners due to their efficiency, compact size, and convenience. Their high efficiency ratings can save you money on your heating bills, while their compact design saves space in your home.

Additionally, energy efficient combi boilers provide instant hot water on demand, ensuring that you’ll never run out of hot water as long as the boiler is functioning properly.

However, it’s important to remember that combi boilers may not be suitable for all homes, particularly those with high hot water demand or multiple bathrooms. In such cases, a conventional or system boiler may be a more appropriate choice.

Ultimately, the decision between a combi boiler and a conventional boiler will depend on your specific needs and preferences, but for many homeowners, combi boilers offer the perfect balance of efficiency, convenience, and performance.

Who can install a combi boiler?

When it comes to installing a combi boiler, it’s essential to hire a qualified and Gas Safe registered heating engineer or plumber to ensure a safe and proper installation. The installer must adhere to building regulations and ensure that the boiler is installed on an appropriate wall with adequate clearance in front of it.

To find the best installer and price for your needs, it’s recommended to get multiple quotes from different heating engineers or plumbers.

This allows you to compare the services and prices offered by different professionals and make an informed decision on who to hire for your combi boiler installation.

Upgrading Your Central Heating System

Upgrading your central heating system to a new boiler, specifically a combi boiler, can offer numerous benefits, making it a worthwhile investment for many homeowners.

With increased efficiency, space savings, and instant hot water supply, a combi boiler can revolutionize your heating experience and save you money in the long run.

If you’re considering upgrading your heating system, a combi boiler is certainly worth considering for the many benefits it provides. Before making the decision to upgrade, consult with a professional heating engineer to determine if a combi boiler is the right choice for your home.

They can assess your current heating system and help you weigh the advantages and disadvantages of different types of boilers, ensuring you make the best choice for your specific needs and preferences.

Summary

In conclusion, combi boilers offer an array of benefits that make them an attractive choice for many homeowners, including high efficiency, compact size, instant hot water supply, easy installation, boiler modulation technology, and built-in WiFi.

However, it’s important to consider your home’s size, hot water demand, and existing heating system when deciding between a combi boiler and a conventional boiler.

By carefully evaluating the advantages and limitations of each type of boiler and consulting with a professional heating engineer, you can make an informed decision and choose the perfect heating solution for your home.

With the right boiler in place, you can enjoy a comfortable, efficient, and reliable heating experience for years to come.

Frequently Asked Questions

Is it worth getting a combi boiler?

Given the high efficiency, cost savings on heating bills and affordability of parts, it is worth getting a combi boiler. See how much a new boiler costs here.

Is it worth upgrading to a combi boiler?

Considering the numerous benefits of installing a combi boiler, such as improved energy efficiency, lower running costs, and the convenience of not needing a hot water tank, it is well worth upgrading to a combi boiler.

The installation process is relatively straightforward and can be completed in a day or two. The cost of installation is also relatively low compared to other types of boilers, making it a great investment for any homeowner.

Once installed, a combi boiler can provide hot water on demand, meaning you will have hot water on demand.

Why not to have a combi boiler?

In conclusion, combi boilers may be a great choice for those with smaller properties and who want to make their heating bills more cost-effective. However, it may not be suitable for larger homes with higher hot water demands due to its lack of back-up water tank.

What is the main difference between a combi boiler and a conventional boiler?

The key difference between a combi boiler and a conventional boiler is that the former supplies hot water directly from the mains, while the latter relies on a separate hot water cylinder and cold water storage tank.

This means that a combi boiler is more efficient and takes up less space than a conventional boiler, as it does not require a hot water cylinder or cold water storage tank.

Are combi boilers more energy-efficient than conventional boilers?

Combi boilers are indeed more energy efficient than conventional boilers, with an efficiency rating of up to 94%, compared to the 70-80% of a conventional boiler.