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New Combi Boiler Installation

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Is your central heating powered by
Do you currently have a hot water tank? (Usually found in an airing cupboard)
How fast does the water flow from your tap?
How many radiators do you have?
When do you need your new boiler?

What is a combi boiler?

A combi – or combination – boiler is a single, compact unit that’s designed to provide both heating and hot-water. A typically space-saving option, this boiler is designed to heat water immediately, rather than heating and storing, which removes the need for a bulky hot water storage cylinder or cold-water storage tank, as usually found with older boiler systems.

How does a combi boiler work?

To provide hot water, combi boilers are on constant standby and connected to the mains water supply. When a tap is turned on, the boiler is triggered into action and it heats the water through a heat exchanger, for on-demand hot water any time of day.

A combi boiler follows the same heating process as a conventional boiler, but the expansion tank is contained in the boiler itself, so water is heated within the boiler before being sent to the radiators.

Pros & cons of a combi boiler

Every household is different, so each home will have their own central heating requirements. There are a number of advantages of having a combi boiler installed into your home, however they may not be suitable for everyone. Here’s a list which in our opinion details some of the pros and cons of combi boilers:

  • Space saving – could be fitted into a standard-sized kitchen cupboard
  • No large water storage cylinders or tanks
  • As there are fewer pieces to the boiler, you have a much lower risk of your pipes freezing
  • Typically quicker and easier & cheaper to install than standard boilers
  • If you have a large, busy household with multiple bathrooms, you could lose water pressure
  • All of the heating takes place within one central unit, meaning when the hot water is turned on, the central heating will be paused

Popular combi boiler brands

At Help-Link we supply a range of combi boilers from some of the leading brands in the industry and we have the knowledge and experience needed to help you make the best decision for your home. The brand you choose could affect factors such as your installation price, so its always best to consider manufacturers when making your choice. Brands we work with include:

Wocester Bosch Group logo

Worcester Bosch is one of the industry’s leading brands and has been manufacturing heating solutions for over 50 years. Their Greenstar range has been awarded a Which? Best Buy for 8 consecutive years.

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Vokera boilers logo

With a strong set of internal values, Vokèra is motivated by a commitment to customer satisfaction. This manufacturer continually endeavours to supply boilers that are both energy-efficient and diverse.

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Ideal logo

With over a century’s worth of experience, Ideal has made their mark in the domestic heating industry by supplying top-quality and energy-efficient heating solutions to a variety of homes and central heating needs.

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Vaillant logo

Vaillant has been supplying heating solutions for households for over 140 years. Regarded by many as an industry trailblazer, this brand is often identified as a pioneer of the combi boiler.

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Baxi logo

Having manufactured boilers since 1866, Baxi is an experienced and well-esteemed domestic heating brand. With over 100 years of industry experience are commited to supplying boilers that are easy to install, use and maintain, this boiler brand continues to strive to meet customer needs across the globe.

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Glow-worm logo

For over 80 years, Glow-Worm has manufactured top-quality boilers with energy-efficiency and reliability in mind. The brand continues to manufacture boilers that could both effectively and efficiently meet homeowner needs.

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Which combi boiler could be best for you?

Making a decision about which combi boiler is best for your home can be a difficult task; especially with all the options to choose from. To help make your decision easier, here’s a list of some popular combi boilers:

Model Series KW outputs (available) Key features Efficiency Rating Average price (without installation)
Worcester Bosch Greenstar 25i, 30i Simple boiler controls, low energy pump, instantaneous hot-water A £875 - £950
Ideal Logic+ C24, C30, C35 Large digital display, boiler frost protection, low lift weight A £670 - £1100
Ideal Vogue C26, C32, C40 Premium components, low lift weight, backlit 3.5” LCD full colour display A £895 - £1221
Vaillant EcoTec Pro 24,28,30 Fully modulating low NOx burner fan, Quiet Mark accreditation, 2-stage frost protection A £857 - £1007

What size combi boiler do you need?

Combi boilers come in a range of outputs, each suitable for different homes and central heating needs. For example, a 28kW boiler could suit a medium-sized home with average heating hot-water needs, whilst a 40kW boiler could suit a large household with a higher central heating demand.

It can be tough to determine the boiler kW output needed for your home, so to provide you with some added help, here’s a table briefly estimating some typical kW outputs and the types of homes they could suit:

24-27kW: 1-2 bedroom, 10 radiators, 1 bathroom

28-34kW: 3-4 bedroom, 15 radiators, 1-2 bathroom

35-42kW: 4+ bedroom, 20 radiators, 2+ bathroom

This information has been supplied By Help-Link UK limited and has been produced for information purposes only and should not be used or relied upon as a substitute for professional advice by a suitably qualified engineer.

How much does it cost to get a combi boiler installed?

The price of a combi boiler differs depending on the brand, size, output and maximum flow rate. The more powerful the boiler, the more it’s likely to cost. Rather than trying to cut costs, you’ll need to choose your new boiler based on the requirements of your home.

Price is likely to be an important factor when choosing your new boiler, so it’s best to work out which type will be the most cost effective with regards to installation, as well as in the future. In some cases, installing the same boiler type (e.g. combi boiler for combi boiler) could be the cheapest option, however this is not always the case, nor is it always the best choice. If you feel like your home could benefit from having another boiler type installed it may be best to switch.

Our free online quote tool is designed to help you find the best boiler for your home. The tool aims to consider factors such as your central heating requirements and budget to provide you with a personalised recommendation for a boiler along with an indicative quote for the cost of installation. Try our free quote tool today or alternatively, give us a call. Our expert team could provide you with the help and advice you need to make the best decision.

[28] Exclusions apply. See www.help-link.co.uk/fixed-price-quote-faqs/

[79] 5% online discount is available to domestic gas customers who receive an online quote for all boiler brands excluding the Ideal Logic HE24, HE30, HO15, HO18 & HO24 and Worcester Bosch 25i ERP, 30i ERP, 15ri, 18ri, 24ri, 30 CDI Classic & 40 CDI Classic boilers which qualify for the winter bundles offer. £50 additional discount available on all like-for-like system swaps and a £100 discount is available on conventional to combi, and combi to conventional boiler swaps. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Help-Link UK Ltd include a filter as part of your quote as this is highly recommended by the boiler manufacturer as a key component in maintaining boiler health, functionality and may potentially be looked upon favourably by manufacturers when assessing warranty work. This filter can be removed at the customer’s request. Quote also includes a programmable thermostat for all combi boiler installations as this is a legal requirement as part of the Boiler + legislation introduced 6th April 2018, and cannot be removed from the installation unless; it is replaced with an alternative smart thermostat; or another energy saving measure as listed in the Boiler + legislation or if a smart thermostat already exists within the property. Offer is not available to Help-Link UK Ltd or HomeServe group employees. This offer cannot be used in conjunction with any other offers. Help-Link UK Ltd have the right to withdraw or change the offer at any time. Online discount is automatically applied when the customer gets a quote using the online quote system at help-link.co.uk and as long as the customer meets all the above criteria.