Complete guide to a new combi boiler installation

Combination or “combi” boilers are one of the most popular choices of home boiler systems within the UK. True to their name sake, these heating systems combine efficient water heating with powerful central heating in one to provide households with on demand hot water and heat.

Our A-rated combi boilers are a great choice for most homes. They’re typically easy to install, compact, and available in a range of sizes and outputs. Our boilers are also compatible with a selection of fuel sources, so whether you’re in need of a LPG, oil or gas combi boiler we have an extensive range of boilers that should be able to suit your needs.

Try our free quote service today if you’re interested in getting a new combi boiler or if you’re facing any trouble with the one you have installed. Our sales team will be in touch in a jiffy.

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What is a combi boiler & how does it work?

A combi boiler is designed to be a highly-efficient means of concurrently heating the water within your home and providing central heating. Combination boilers control your whole central heating system directly from one, compact unit and provide a range of advantages based on factors such as space, energy and costs.

One of the main features of these boilers is their ability to provide instantaneous hot water without water tanks or cylinders, making them typically easy to install and less likely to take up excessive space. This water is filtered through your pipes and fed into your household taps whilst also being used to heat up your radiators. By turning on the hot water tap, you trigger a response that signals the boiler to start heating water from the inside of the system. The heat exchanger transfers the majority of the heat from the burnt gas inside of the boiler to the cold water, and then delivers it to the taps as required.

Modern combi boilers are manufactured to double as condensing boilers which means that they are able to generate water vapour condensation to extract additional heat from its fuel. This is designed to make them even more energy-efficient as they produce more heat with less energy, potentially enabling you to reduce your monthly bills.

The control valves in combination boilers operate in different directions, so it either allows water to flow through the central heating system or diverts it to the appropriate hot water tap— but never both at the same time. You have the option of pre-setting your desired room temperature, this programmes the boiler to work with the room thermostat to ensure your home is heated as you like.

 

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Advantages of a new combi boiler

More and more homeowners are deciding to replace their conventional boiler with a combi boiler, which are typically more efficient. This isn’t surprising when you consider the multitude of advantages that could come with installing a new combi boiler into your home. Buying a combination boiler could positively impact your finances, the decor of your home and your overall lifestyle.

If you, like many others, decide to switch to a combi boiler you could benefit from a number of its advantages. For example, these boilers are designed to be:

 

Compact

There’s no need for any separate tanks or cylinders with combi boilers. They have everything they need packaged in one, so they could leave you with plenty of room to decorate your household as you please. Combi boilers could be a great choice for households with limited space.

Instantaneous Hot Water

By installing a combi boiler, you provide your household with on demand hot water. No water tank = no waiting time!

Efficient & Economical

Combination boilers are designed to be highly-efficient, producing condensation in order for more energy to be used rather than wasted. They also only heat the water that you use, enabling you to potentially make huge savings on your energy bill. You could save up to £215!**

Safe

The cold water released from a combi boiler is more likely to be safe for you and your family to drink as it is fed directly from the mains (although please note this is subject to environmental water advice in your area). This is not always the case with conventional boiler systems as they tend to store cold water in tanks.

Clean

As combi boilers release water directly from the mains, they are less likely to accumulate sludge or debris. This may help prevent boiler issues such as kettling from occurring and could thus save you money in future repair costs.

Potentially capable of boosting your home’s appeal

Due to the numerous advantages of having a combi boiler, you could add it to your list of selling points if you ever choose to sell your home.

Here at HomeServe, we aim to only install products supplied by the best boiler brands, helping ensure that your home heating is functioning in the best way at all times.

Here are some of our top brands for combi boilers:

Worcester Bosch

A popular choice for homeowners within the UK, Worcester Bosch is a British-based domestic heating and hot water product manufacturer.

  • Rated Best Buy by Which? Online review
  • Premium quality
  • Environmentally Conscious

Find out more about Worcester Bosch boilers here.

Ideal

Based in the city of Hull, this boiler brand has specialised in heating solutions for over 100 years.

  • Good Housekeeping Reader Recommended
  • 4-star Which? Online review customer rating
  • Promote strong Values of Customer Service & Innovation

Find out more about Ideal boilers here.

Vokera

This brand is one of the UK’s leading heating manufacturers. Part of the Riello Group, Vokèra has been supplying quality heating products for over 30 years.

  • Continuous Innovation & Technological Advancement
  • H & V News Award Nominated for Domestic Heating Product of the Year
  • Extremely Versatile Products

Find out more about Vokera boilers here.

Vaillant

Established in 1874, this brand pioneered the combi boiler over 35 years ago and has continued to create premium heating products ever since.

  • Extensive Industry Experience
  • Environmentally Aware
  • Forward Thinking

Find out more about Vaillant boilers here.

Baxi

Based in the West Midlands, this brand has been active since 1866. Part of BDR Therma, Baxi aims to supply their customers with reliable, highly-efficient heating products.

  • Company ethos of pride, passion and positivity
  • Values of reliability, respect & innovation
  • Winner of heating product of the year with the Baxi 400 combi boiler

Find out more about Baxi boilers here.

 

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Most popular combi boilers

Selecting a boiler for your household can be a difficult decision to make. If, like many homeowners, you’re struggling to make a choice, here’s an insight into our 4 top selling combi boilers of 2018:

1. Worcester Bosch Greenstar 30i

  • Combination boiler, natural gas
  • Higher hot water flow rates of up to 12.3 litres/min
  • Designed with a user-friendly control panel
  • 400mm x 710mm x 330mm (Width x Height x Depth)
  • Suitable for most small to medium homes with one bathroom

2. Worcester Bosch Greenstar 25i

  • Combination boiler, natural gas
  • Featured condensate siphon to eliminate the risk of condensation freezing
  • Compact build
  • 400mm x 710mm x 330mm (Width x Height x Depth)
  • Ideal for most small to medium sized homes with one bathroom

3. Ideal Logic 24kW

  • Combination boiler, natural gas
  • Designed with a backlit display & user-friendly controls
  • Designed with an easy to use pressure gauge
  • A suitable choice for most smaller properties with one bathroom
  • 395mm x 700mm x 278mm (Width x Height x Depth)

4. Ideal Logic 30kW

  • Combination Boiler, natural gas
  • Compact design
  • Designed with easy to use controls
  • 395mm x 700mm x 278mm (Width x Height x Depth)
  • An ideal choice for most households with limited space and no more than one bathroom

 

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Cost of a combi boiler installation

“How much will a new combi boiler cost?” This is a question on the minds of a great deal of homeowners in the UK. The cost of a new combi boiler is dependent on a number of factors. These can include the type of boiler it is, its size as well as the cost and complexity of the installation process.

Often the cost of the combi boiler itself will be significantly lower than the overall price given by the person installing it. This will usually be due to the additional cost of installation, which can indeed be a complex process. Although this overall cost may seem expensive, it is important to remember that you are paying for quality. All installations should be carried out by a Gas Safe registered engineer who will follow strict protocol checks and procedures. This should provide you with peace of mind and allow you to have confidence in the fact that your installation has been completed to the highest regulated standard.

Boiler prices can also be affected by the product’s brand. Here at HomeServe, we aim to only install boilers of high quality from reputable boiler labels. This allows our customers to rest assured that getting their home heating up and running effectively is our priority.

Here at HomeServe, we provide our customers with a means of assessing how much it would cost to install a new boiler into their home. Our free quote service will take into account factors such as your current central heating system, how many radiators you have and whether you are planning on having a gas combi boiler or an oil or LPG combi boiler. If you’d like to receive a valuable estimate of how much your new combi boiler installation could cost, try our instant, online quote now.

 

 

Which combi boiler is best for my home?

Combi boilers can come in a range of shapes and sizes, each suitable for specific kinds of properties and rooms. Due to this, choosing the right boiler for your home can seem to be a quite a  conundrum. Nevertheless, ensuring that you make the right decision for your home is significantly important as it can affect the quality of heating that you and your family receive, and thus impact the level of comfort that you feel in your home.

 

A key factor to consider when making a decision about a suitable boiler for your home is the kW output required. kW outputs relate to the size of the boiler and are reliant on the number of bathrooms and radiators present within your household. The higher the kW output of your boiler, the better the supply of hot water you’d receive. However, this is not to say that you should purchase the highest output available, you must ensure that the boiler size correlates with the size of your home.

Here’s a simplified guide to the average kW output needed based upon the property size:

24-27kW 1-2 bedroom, 10 radiators, 1 bathroom
28-34kW 3-4 bedroom, 15 radiators, 1-2 bathroo
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.)

 

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Benefits of switching to a combi boiler

If you make the choice of switching to a modern combi boiler, you could notice the advantages instantly. For example, you could have considerably more room available in your home as combi boilers, in contrast with conventional boilers, do not take up excessive space. A large amount of room is needed for conventional boilers as they require additional components such as cylinders and tanks. Additionally, with conventional boilers you can be limited to the hot water available in the tank; whereas with a combi boiler, hot water is always available at your command. Combi boilers could also be a cheap and easy option because they usually hang on your wall in a single unit with less components required than a conventional or system boiler. Although, switching from one system type to another could incur some additional costs due to tasks such as pipework rerouting, as well as other factors.

All in all, installing a new combi boiler into your home could prove to be significantly beneficial for your household. These boilers are typically extremely practical and efficient, using energy in the most useful way to deliver instantaneous hot water without using excessive fuel. Combi boilers can therefore be deemed as a cost-effective option, capable of saving you up to £215** on your yearly expenses. If you feel that you could benefit from installing a new combi boiler into your home, try our free quote tool online to get a better idea about how much a new installation could cost. We can then arrange an appointment with one of our trained surveyors, and you’ll be on your way to benefiting from the plethora of the advantages of a combi boiler in no time!

 

*Online discount is available to domestic gas and LPG customers who receive an online quote for all boiler brands excluding Ideal Logic HO18 & HO24 & like-for-like system swaps on the Ideal Logic HE24 and HE30, and Ideal Logic HO12 & HO15 boilers. Discount will be applied as long as the quoted price is still applicable at the point of sale. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Offer is not available to HomeServe employees. | All boiler manufacturer types on like-for-like system swaps excluding the following boilers: Ideal Logic HE24 & HE30, Ideal Logic HO12, HO15, HO18 & HO24 are eligible for a £50 discount and then 5% discount off the final quoted price. Conventional to combi boiler swaps also qualify for an additional £100 discount after 5% initial discount is applied. This offer cannot be used in conjunction with any other offers. HomeServe 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 www.HomeServeboilers.com and as long as the customer meets all the above criteria.

** Source: energysavingtrust.org.uk. Saving calculated when replacing G rated with A rated boiler in a semi-detached house.