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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.
If you’re considering upgrading to a Combi Boiler, check out our pages on New Boiler Cost, Boiler Types, and Which Vaillant Boiler to find the best option for your home.
Get a New Vaillant Boiler Installation with 10 year Parts & Labour Warranty Included
Get a New Worcester Bosch Boiler Installation with up to 12 years Parts & Labour Warranty Included
Get a New Baxi 800 Boiler Installation with 10 year Parts & Labour Warranty Included
Get a New Glow Worm Boiler Installation with up to 10 years Parts & Labour Warranty Included
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 unvented 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.
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.
For more information on upgrading to a modern, efficient new boiler, explore our New Boiler Installation page.
Efficiency is one of the major benefits of combi boilers. Combi boilers utilise less energy than system boilers and conventional 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.
Considering upgrading to a more efficient heating system? Explore our Full Central Heating Installations to optimise your home’s heating efficiency.
Make sure you choose a combi boiler that's the right size for your home and your hot water needs
Annual Servicing is Required
Choose a reputable brand with a good track record for reliability and performance such as Worcester Bosch, Vaillant, Baxi or Glow Worm.
In today’s market, combi boilers emerge as an excellent option, offering efficiency and convenience. While air source heat pumps boast higher efficiency, they come with a significantly higher price tag and often require property upgrades.
Consequently, many homeowners opt for combi boilers as their preferred heating and hot water solution. If you’re considering installing a combi boiler, prioritise reputable brands and trusted installation and servicing companies for peace of mind.
For expert advice and installation, explore our pages on Combi Boiler Conversions, Hydrogen Ready Boilers, or Air Source Heat Pumps.
When it comes to selecting the best combi boiler for your home, several reputable brands stand out, including Vaillant boilers, Worcester Bosch boilers, Baxi boilers, and Glow-worm boilers. Each of these brands offers a range of high-quality combi boilers known for their efficiency, reliability, and durability.
A combi boiler (combination boiler) is a compact heating system that provides both central heating and hot water on demand without the need for a separate water tank. It heats water directly from the mains supply.
A combi boiler heats water as you need it, using a heat exchanger. When you turn on the hot water tap, cold water enters the boiler, is heated, and flows directly to the tap, eliminating the need for a storage tank.
Combi boilers offer several benefits, including space-saving design, reduced installation costs (since there’s no need for a hot water tank), on-demand hot water, and improved energy efficiency, as they only heat water when needed.
Yes, combi boilers are generally very energy-efficient. Many models have an efficiency rating of over 90%, meaning they convert most of the energy they consume into usable heat, helping to lower energy bills.
08/01/24
Tam and his team, great price, great installation , clean tidy, great after care. Most of all Nice people. Vaillant Ecotec Plus. Rad installed.In the words of Tina Turner “simply the best”
05/01/24
Installed a new boiler for us in 2022. New Year’s Eve 2023 we had an unrelated problem with our Co2 alarm, Ed called me, then came round to check everything was fine – fantastic service and we were so grateful!
12/11/23
We had a boiler replaced. The team were amazing from quotation to installation. The new boiler was installed in a day. The house was left tidier than when they arrived. Highly recommended.
03/01/24
19/10/23
Referred to this amazing company Master Gas London as l needed to replace an old boiler. I contacted them, in a couple of days, surveyed, detailed quote with recommendations, and installation arranged.
21/12/23
New boiler, replacement of leaking underfloor heating manifold, rerouting overflow pipe, improved piping in cellar – all completed to a high standard in one day. Thanks!
18/11/23
Highly recommend Master Gas for any boiler issues. They came and fitted a new boiler quickly and at a fair price & were a pleasure to have in the house. Highly recommend.
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.
