07th February, 2022

Replacing Combi Boiler Guide 2022

Replacing your boiler can be a stressful and costly process. That’s why we have written this helpful article to show you your options when it comes to buying a new boiler.

Replacing Combi Boiler Guide 2022

Switching to a Combi Boiler

Has your boiler stopped working, then you are now in need of a replacement, you should consider replacing it with a combi boiler if you haven't already got one. Combi boilers are a brilliant replacement for when you want to increase efficiency and space in your home. We have a great range of best combi boilers available through iHeat.

A combi or combination boiler combines a water heating system and central heating unit into a single body, acting as a unified way to handle heating and hot water without needing two separate boilers and produces hot water on demand.

This means there is no need for a separate water tank system and therefore takes up much less space in your home, which is a major benefit for smaller homes.

Viessmann Worcester Combi Boiler

Another great benefit of a combi boiler is its efficiency. By heating water on demand as opposed to constantly heating stored water, you can save energy and cut costs on your fuel bills.

A new combi boiler should be around 90% efficient, so replacing your old boiler could save you up to £300 according to The Energy Saving Trust.

You can find out more about swapping to a combi boiler here.

Getting an A Rated Efficient Boiler

The efficiency of your boiler plays an important role in how well your boiler operates as well as the cost of your fuel bills.

The higher the efficiency of your boiler, the lower your fuel costs. The Energy Saving Trust estimates that you could save up to £300 a year by replacing your old inefficient boiler with a new A-rated one (90%+ efficient).

All iHeat boilers are A-rated for efficiency, so you know you can rely on us to help you save money and reduce your carbon footprint.

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Buying Your Boiler on Finance

Paying for a boiler on finance spreads out the cost to make it more affordable on a monthly basis instead of paying for it all at once.

With iHeat you can buy a brand new boiler on finance using our super simple to use website with an instant quote and fixed price.

We offer great plans such as 0% APR for 2 years or as little as £10.32/month for 10 years. These prices include the boiler, installation and up to 10 Years Warranty which is activated by the installer as soon as the job is done.

Boiler On Finance

Relocating your boiler

At iHeat, we’re happy to move your boiler from one place in your home to another, providing it is practical.

For example, if your old boiler was taking up far too much room in your kitchen cupboard, you can replace it with a boiler that fits in your airing cupboard. However, you should consider if moving your boiler is worth the extra labour cost.

The Size of Your Boiler

When we talk about boiler size, we’re often referring to the output in kilowatts (kW) as opposed to the physical dimensions of the boiler itself. Kilowatts are the measurement of energy that is output by the boiler in the form of heat.

The right kW boiler for your home depends on a number of factors, including your demand for hot water, the number of bedrooms, bathrooms and radiators.

In general, the higher your demand for heat and hot water, the higher the output you will need.

Size of Home

No of Bedrooms

No of Bathrooms

No of Radiators

Boiler Size

Flat / Bungalow



Up to 10


Medium terrace/semi-detached



Up to 15


Large semi-detached/detached



Up to 20


Different Size Homes Boilers Considering these options before buying a new boiler can really help you to save money on the boiler, installation and fuel bills that follow.

For a free fixed quote for replacing your boiler, click here. For more information, visit our FAQs, Boiler Help or alternatively, contact us through our live chat, email or call us on 0333 305 6880.

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