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Combi Boilers: The Complete Guide

A combi boiler may be the best option for you if you want a heating system that provides both central heating and hot water on demand without the need for a separate water tank. What exactly are combi boilers?. This guide will help you to understand everything you need to know about combi boilers, the history, efficiency, pros & cons.

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About Combi Boilers

Combining a high-efficiency water heater and a central heating boiler into one unit is what combi boilers, also known as combination boilers, do. Without the need for a separate water tank or cylinder, they give your house both hot water and heat your radiators. Since combi boilers do not require a separate water tank or external components, they are perfect for houses with limited space.

Worcester bosch greenstar 4000 installers

Worcester 4000
25kw

10 year parts and labour warranty
Fixed price £2449

Hisory of Combi Boilers

Early 1960s saw the introduction of combi boilers, but it wasn’t until the 1990s that they really took off in the UK. They were initially intended to offer small apartments and dwellings energy-efficient, space-saving heating and hot water. eliminating the requirement for hot water storage cylinders and cold water storage tanks. Combi boilers are one of the most widely used types of boiler in the UK today and are used in homes of all sizes.

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Vaillant Ecofit Pure
25kw

10 year parts and labour warranty
Fixed price £2245

Efficiency of Combi Boilers

Efficiency is one of the major benefits of combi boilers. Combi boilers utilise less energy than traditional boilers since they only heat water when it is required, as opposed to keeping it warm in a tank. They can therefore assist you in lowering your carbon impact and save money on your energy bills. Combi boilers can achieve even greater efficiency when installed with smart technology, such as a smart thermostat and smart radiator valves.

Baxi boiler installers

Baxi 800
25kw

10 year parts and labour warranty
Fixed price £2065

Pros of Combi Boilers

Compact Size

Combi boilers require less space as they remove the need for cold water storage tanks and hot water storage cylinders. This makes them ideal for homes where space is at a premium.

Energy-Efficient

They only heat water when it’s needed, this makes them more energy-efficient than traditional boilers connected to hot water storage cylinders.

Warranty

All components are housed within the boiler, therefore covered under the manufacturers warranty. 

Cons of Combi Boilers

Limited Hot Water Supply

If you have a large household and need to use multiple hot water outlets at the same time, a combi boiler might not be able to keep up with demand.

No Backup Hot Water

If your combi boiler breaks down, you won’t have any backup hot water.

Glow worm boiler installer

Glow Worm Energy
25kw

10 year parts and labour warranty
Fixed price £2065

Things to Consider

When choosing a combi boiler, there are a few other things to consider:

 

Size: Make sure you choose a combi boiler that’s the right size for your home and your hot water needs.

 

Brand: Choose a reputable brand with a good track record for reliability and performance such as Worcester Bosch, Vaillant, Baxi or Glow Worm.

 

Maintenance: Make sure you have your combi boiler serviced regularly to keep it running smoothly and efficiently.

Worcester bosch greenstar 4000 installers

Worcester 2000
25kw

7 year parts and labour warranty
Fixed price £2135

Summary of Combi Boilers

In conclusion, homeowners that desire an effective, space-saving heating and hot water solution frequently choose combi boilers. They have both pros and cons. For many households they are the most popular choice. If you’re thinking about getting a combi boiler for your property, make sure to choose a reputable brand and hire a trusted and reviewed company to install and service it.

Vaillant ecotec plus boiler installer

Vaillant Ecotec Plus
25kw

10 year parts and labour warranty
Fixed price £2565

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What Our Customers Say...

Metty Allen
Metty Allen
18/04/2023
I would definitely recommend Master Gas. They deliver a good service. They're reliable and take great care in carrying out my Gas & Plumbing work in a highly professional manner.
mary lewis
mary lewis
20/03/2023
Would highly recommend. They did a fantastic job with minimum disruption. The system they installed works perfectly as expected. They were always mindfal of the property. Came across as very knowledgeable and professional.
Ja Ma
Ja Ma
16/03/2023
Great service, highly recommended professionals. Ed was hard working and patient. Answered all my questions via Whatsapp and call even after the boiler was installed. Will be using again for sure.
Gillian Latiff
Gillian Latiff
01/03/2023
I had received an extortionate quote from another company and wanted to compare it to Master Gas London. I spoke with Ed and he was so knowledgable and honest. He took the time to explain the different boiler options and let me know the pros and cons of the different boilers. He was very patient and I am so appreciative of the time he took with regards to the choices I could make. It is such a shame I am located too far away to use this company, as their professional response and advice was outstanding.
Thomas Rapley
Thomas Rapley
11/12/2022
5 star! Amazing service. Highly recommend. Thank you Ed, will 100% be using master gas London for all my boiler needs.
Liam Andrews
Liam Andrews
19/10/2022
Highly recommend. Could not fault Ed and Tamer. They were efficient, on time, went out of their way to ensure we were pleased with the work, and took time to explain the new system. The work was finished to a high standard and all pipework routed beautifully.
ai Onishi
ai Onishi
06/06/2022
I was very anxious about my boiler to be fixed properly until I found Ed from the first telephone call, my anxiety has been eased off immediately because he was so polite, explained potential issues and he tried to book me in as quickly as possible even though he is very busy. He was so professional from beginning to end. At the site he investigated the problems and explained to me the issues and he didn’t leave until everything was sorted out properly. Today I was able to take a comfortable bath for the first time in a long time. Thank you Ed. Highly recommend and will definitely recommend to my friends!
Gracie-Mai Walker
Gracie-Mai Walker
28/04/2022
The team are the nicest people on earth so nice and warming, very trustworthy and didn’t leave til the job was done. Worked from 8am til 10pm one day just to get everything running. Couldn’t recommend a better company.
Ubaid Khan
Ubaid Khan
25/04/2022
Erin Delaney
Erin Delaney
19/02/2022
Ed and team came to install a new boiler a few months back and I've been meaning to leave a review ever since because they were so great. Worked all day and didn't leave us until everything was working. They are more than happy to stay in touch if there's any follow ups too which is great.

FAQ'S

A combi boiler is a type of boiler that provides both heating and hot water to your home in one compact unit. It works by heating water directly from the mains supply as and when it is needed.

The size of your property, number of bathrooms and radiators will determine the size of the combi boiler required for your home. Use the free Master Gas London quote tool to find the correct sized combi boiler for your property.

The lifespan of a combi boiler can vary depending on factors such as the brand, model, usage and maintenance. On average, a combi boiler can last between 10 and 15 years.

Combi boilers do not require a separate hot water tank or hot water storage cylinder. They only heat water when needed. This means reduced heat loss and waste, resulting in higher efficiency and cheaper energy expenses.

Yes, a combi boiler can supply hot water to multiple taps and showers at the same time. It is always dependant on the flow rate of the cold mains to the property. With any pressurised system the flow rate and bar must be adequate.

It’s recommended that a combi boiler should be serviced once a year by a Gas Safe registered heating engineer. Regular servicing helps to ensure that the boiler is running safely and efficiently.

Pros of a combi boiler include: compact size, energy efficiency, on-demand hot water, and reduced energy bills. Cons of a combi boiler include: limited hot water supply, may not be suitable for larger properties or high hot water demand.

The cost of installing a combi boiler can vary depending on factors such as the brand, model, and the complexity of the installation. On average it can cost between £1600-£4000 for a combi boiler installation.