Combi Boilers: Choose the best right option – a simple guide

Finding the best combi boiler quotes and trusted company to install it in your home can be a daunting task. There are dozens of models for you to choose from, with varying prices and efficiency ratings that you need to consider. Even after you narrow down your search to a few models, it can be hard to tell which one is the best fit for you and your home.

That’s why we’ve put together this comprehensive comparison guide outlining the top 10 combi boilers based on ratings from the leading review websites, efficiency ratings, boiler only prices, and average costs including installation. We’ll also provide you with handy tips and tricks so that you can make an informed decision when it comes time to choose a boiler for your home. So if you’re looking for a reliable combi boiler that fits your budget, this guide is a must-read!

Introduction to Combi Boilers

Combi boilers are an efficient and modern way of heating both your home and hot water instantly. This type of boiler is suitable for small to medium sized properties as it doesn’t require a separate hot water tank. Combination boilers were originally imported from Europe, and have an efficiency rating of over 90%. As such, combi boilers provide hot water on demand and tend to be the boiler of choice for most households.

The average cost of a combi boiler and installation can vary significantly between brands, models, and installers. This can range from around £1,500 to £3,000 depending on the size and complexity of the job. In some cases it might even be possible to convert your current boiler to a combi boiler – this will usually be more economical than starting from scratch as you won’t need as much additional pipework and labour.

Top 10 Combi Boiler Models

When considering the right combi boiler for your home, you’ll want to look at three criteria: ratings from leading review websites, efficiency, and cost. With this in mind, here are the top 10 combi boiler models on the market today:

A-Rated Efficiency

  1. Baxi Duo-Tec GA Combi Boiler
  2. Viessmann Vitodens 100-W Combi Boiler
  3. Vaillant ecoTEC Plus 831 Combi Boiler
  4. Worcester Bosch Greenstar 30i Combi Boiler
  5. Intergas HRE 24/18 Combi Boiler

B-Rated Efficiency

  1. Potterton Gold 24 HE Combi Boiler
  2. Remeha Quinta Pro 28C Combi Boiler
  3. Ideal Logic+ 24 Combi Boiler
  4. Heatline Capriz2 Compact 24 Combi Boiler

C-Rated Efficiency

  1. Halstead Ace High Flow 24KW ErP Combi Boiler

All of these models come with benefits like increased water pressure and temperature controls that make them well suited to meet your home heating needs while remaining affordable and efficient in the long run.

Evaluating Efficiency Ratings

When considering the efficiency level of a combi boiler, two ratings should be taken into account – the efficiency rating (ER) of the boiler and its energy efficiency rating (ErP).

Non-condensing boilers typically have efficiency ratings of 80-88%, while condensing boilers are far more efficient, with ratings above 88%. Boilers that are sold in the United Kingdom must have a factory-certified efficiency of at least 92-94% (ErP). This means that it will consume much less energy than older models.

Combi boilers are also relatively easy to maintain, as they do not have an external tank or hot water tank. This reduces their carbon footprint and lowers your energy bills in the long run.

Understanding Prices & Installation Costs

The cost for a combination boiler can vary drastically, depending on the brand and model, as well as the installation costs. Knowing what to expect when it comes to price and installation costs can help you make an informed decision.

On average, a combi boiler installation will cost between $6,000 and $10,000. This includes the cost of both the boiler and the installation itself. The average cost to replace a boiler is $7,938 – this includes both parts and labour. In general, installing a boiler typically costs between $6,500 and $11,000 depending on the size, age of your home, and layout of your home’s plumbing.

Fortunately for homeowners looking to save money on their combi boiler installation, Compare Combi Boiler Quotes provides free quotes from Gas Safe registered companies for free. Whether you’re looking for an economical single-zone system or an investment in multiple-zone heating systems with advanced controls you can trust Compare Combi Boiler Quotes to help find a quality combi boiler installation tailored to fit your needs.

Helpful Tips for Choosing a Combi Boiler

When shopping for a new combi boiler, there are several helpful tips to keep in mind that can ensure you make the best choice for your home:

Heat Output

Composite boilers with outputs of 24-30 kW are recommended for households with only one bath and shower. If you have more than one bathroom, then a higher output will be required.

Temperature Control

Turning down the temperature of the domestic hot water can help to reduce the risk of scalding in the shower. Most models come with a separate control for this function and it is recommended that it is set to no more than 55°C.


Combi boilers work most efficiently when the water returning to the boiler is below 55°C. This means that it is important to ensure that all radiators have been fitted with thermostatic radiator valves and all pipe runs insulated – both of which help maintain an optimal temperature.

How to Compare Quotes for a Combi Boiler

Comparing quotes for a combi boiler can be a daunting task. With so many different models and brands to choose from, it can be hard to know which one is right for you. Fortunately, Compare Combi Boiler Quotes makes it easy to compare quotes in just 20 seconds.

When you visit the website, you will be presented with a list of the top 10 combi boilers based on ratings from leading review websites, efficiency, and average cost including installation. Each model page also provides an overview of features and specs so you can compare different boilers side-by-side.

Combi boiler prices vary depending on the brand and model but generally range from £600-£2,000, while the flat rate for installation can be around £2,500. By comparing quotes online through Compare Combi Boiler Quotes, you’ll be sure to get the best deal for your situation!

Graph of average combi boiler installation prices from 2000 to 2023 UK

In the UK, Combi Boiler installation prices have been steadily increasing since the start of the millennium. In 2000, a regular (or system) boiler cost between £1,500 and £3,000 while replacing an old-fashioned conventional boiler with a combi could set homeowners back up to £5,000. As of 2021, the average cost of a high-end combi boiler including VAT and installation is £2,200.

Average Combi Boiler Installation Prices 2000-2023

| Year | Regular Boilers | Conventional to Combi Conversion | High-end Combi Boilers |



Overall, there’s no one-size-fits-all answer when it comes to choosing a combi boiler. Everyone’s needs are different and there are plenty of models on the market that can cater to those needs. It’s important to consider factors such as price, ease of installation, efficiency, and reliability before making a decision. Luckily, Compare Combi Boiler Quotes provides a platform for homeowners to compare the models, get free quotes from trusted Gas Safe registered companies, and ultimately make an informed decision based on their individual needs and budget.

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