ProTech Boilers

Combi Boiler Replacement

0% Finance available across our Worcester Bosch combi range

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Which Best Buy Boilers

We will help you choose the best new combi boiler for your home

Here at ProTech Boilers we are experts in new combi boiler installation & replacement. We offer a wide range of ‘A’ Rated boilers from leading manufacturers and all of our installations are carried out by our Gas Safe registered engineers.

Regardless of whether you are in urgent need of a combi boiler or if you have just started planning your next boiler purchase, we would love to help! Simply fill in our Get a Quote form to get your FREE no-obligation quote or call us on 0800 138 2223 for more information.

Combi boilers explained

One of our most popular types of new boiler is the combination, or ‘combi’, boiler. It is a high efficiency gas water heater and a central heating boiler in a single compact unit. Combi boilers heat water direct from the water mains when you turn on a hot water tap, meaning, you won’t need a hot water cylinder in the airing cupboard or a cold water storage tank in the loft.

Combi boilers are a common choice for a new boiler as they are one of the most cost-effective and energy-efficient, because water is heated instantaneously rather than being heated and then stored in a hot water cylinder. An added benefit is that hot water is pressurised from the mains, so this means that you could get a powerful shower without the need for a shower pump.

Pro's & con's 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 combi boilers may not be suitable for everyone. Here’s a list, which in our opinion, details some of the pros and cons of combi boilers:

  • Compact sizes means combi boilers are ideal for smaller homes
  • Ideal where there is little or no loft space
  • No need for a hot water cylinder which allows you to free-up (airing cupboard) living space
  • Water tanks not needed which frees up a loft space for conversion
  • Less pipework in the home which could make the installation cheaper
  • If you use more than one shower at a time, it can reduce the flow of hot water. But that does also depend on the strength of your incoming mains water pressure and flow rate
  • It may take a few seconds for your hot water to heat up
  • No back-up of hot water, just in case your boiler ever breaks down

Our best selling combi boilers

Worcest Combi Boiler
Greenstar CDi Combi
Ideal Vogue MAX Combi Boiler
Vogue MAX Combi
Vaillant Combi Boiler
ecoTEC Pro Combi

What size combi do I need?

Use our simple tables to size your combi boiler and then find the best boiler in your size range. We have reviewed boiler models from 9 different boiler manufacturers in this comprehensive guide. Sizing a combi boiler is a bit more complicated, but we offer help here too. You will of course need to get a qualified heating engineer to visit your property to size it accurately, but this is a good start! 

Age of property
pre 1900
1920s-1930s
1950-1980s
1990s
2000 onwards
Insulation levels
Poorly insulated
Some insulation
Moderately insulated
Reasonably insulated
Well insulated
No of bedrooms and bathrooms
1 bed + 1 bath
20kW
20kW
20kW
18kW
18kW
2 bed + 1 bath
24kW
24kW
20kW
20kW
20kW
2 bed + 2 bath
24kW
24kW
20kW
20kW
20kW
3 bed + 1 bath
28kW
28kW
26kW
24kW
24kW
3 bed + 2 bath
28kW
28kW
28kW
24kW
24kW
3 bed + 3 bath
30kW
30kW
30kW
30kW
30kW
4 bed + 1 bath
30kW
30kW
30kW
28kW
28kW
4 bed + 2 bath
32kW
32kW
32kW
30kW
30kW

Which combi boiler would 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 is a list of some popular combi boilers.

Model
Series
KW outputs (available)
Warranty Period
Efficiency Rating
Average Price
Ideal
Logic
24, 30, 35
5 Years
A
£749 – £980
Ideal
Logic MAX
24, 30, 35
10 Years
A
£870 – £1115
Worcester Bosch
Greenstar i
25, 30
5-10 Years
A
£920 – £1050
Vaillant
ecoTEC Pro
24, 28, 30
5-10 Years
A
£980 – £1150
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How much does a new combi boiler cost to install?

The cost of a combi boiler differs depending on the brand, size, output and maximum flow rate. More powerful boilers tend to be more expensive. 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 will provide you with the help and advice you need to make the best decision.

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