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Which type of boiler is best for me?

Gas and oil boilers are either ‘system’ boilers, which have a separate hot water cylinder to store hot water, or ‘combi’ boilers, which heat hot water on demand and don’t require a hot water cylinder.

A system boiler is more efficient than a combi boiler at producing hot water, however heat is lost from the hot water cylinder over time.

A combi boiler could be more efficient overall, although this depends on several factors such as how many people there are in the property and whether you are likely to install solar panels in the future.

Having a hot water cylinder allows you to store energy from a solar system – if you are not able to install solar panels then this might influence your decision.

Choosing the right boiler for you will depend on different things, including:

  • Size of property
  • How many people stay in the house
  • How many bathrooms
  • How many radiators

Why choose an A-Rated Boiler

An A-rated boiler is considered top of the range with an efficiency rating of at least 90 percent.

The Energy Saving Trust recommends all A-rated boilers as the best choice for UK customers.

Whether you need a new boiler to your current one that is constantly breaking down or trying to increase the value of your home, an A-rated boiler should be a top priority.

Choosing an A-rated boiler is the best choice as you’ll save money and minimize the impact on the environment simultaneously.

LEAP Boiler Scheme

The LEAP Boiler Scheme offers assistance to fuel poor or vulnerable households to repair or replace broken or condemned boilers. Eligibility is based on benefit and household income.

Click here to find out if you are eligible.


Over 20 years experience

3000+ boiler installs annually

24/7 365 Call Centre

Same day breakdown assistance

Over 140 engineers in Scotland (direct labour only, no contractors)

Family ethos - A company you can trust

Worcester / Vaillant Accredited



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City Technical Services (UK) Ltd
Unit 1, Block 16
Clydesmill Place
Clydesmill Industrial Estate
G32 8RF

24/7 CALL CENTRE: 0333 202 0708


GAS SAFE NUMBER: 304963 | VAT NUMBER: 624 4690 37 | COMPANY NUMBER: SC287172

City Technical Services (UK) Limited, Company Registered in Scotland SC287172, of Unit 1, Block 16, Clydesmill Industrial Estate, Cambuslang, Glasgow G32 8RF, is authorised and regulated by the Financial Conduct Authority FRN912336. We act as a credit broker not a lender and offer credit options from a panel of Lenders. All credit is subject to status and affordability.

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