Helping UK homeowners make the right heating choices

Boiler Buying Guide

Boiler Buying Guide 2018

Simple steps to take for a hassle free boiler installation

It may not be exciting or sexy but a boiler is one of the most important purchases you can make. Know what to expect and be prepared with our boiler buying guide.

Types of Boiler

With a few exceptions all new and replacement boilers must be high efficiency condensing boilers that can reduce CO2 emissions by up to 25%* and could save you up to £305* per year on your heating bills. It makes sense to embrace this new technology and accept that the slightly higher initial purchase cost will re-couped through lower heating bills.

The next stage is to determine what type of condensing boiler will best suit your lifestyle and home. Regular (also known as conventional or traditional boilers), System or Combi?

In most cases this will be determined for you, if you live in a flat you’ll most probably need a combi boiler, if you have a large family home with no space restrictions then a regular boiler or system boiler will be best suited. Either way this is a job for an expert.

Boiler Manufacturers

When it comes to choosing a brand of boiler for your home there’s a lot to think about. From prices to efficiency ratings, we’ve summed up everything you need to know about some of the main boiler manufacturers on the UK market.

AlphaLearn more about AlphaBoiler efficiency ratings
AristonLearn more about AristonBoiler efficiency ratings
ATAG HeatingLearn more about ATAG HeatingBoiler efficiency ratings
BaxiLearn more about BaxiBoiler efficiency ratings
BiasiLearn more about BiasiBoiler efficiency ratings
FerroliLearn more about FerroliBoiler efficiency ratings
FirebirdLearn more about FirebirdBoiler efficiency ratings
Glow-wormLearn more about Glow-wormBoiler efficiency ratings
GrantLearn more about GrantBoiler efficiency ratings
IdealLearn more about IdealBoiler efficiency ratings
IntergasLearn more about IntergasBoiler efficiency ratings
Johnson & StarleyLearn more about Johnson & StarleyBoiler efficiency ratings
KestonLearn more about KestonBoiler efficiency ratings
MainLearn more about MainBoiler efficiency ratings
MistralLearn more about MistralBoiler efficiency ratings
PottertonLearn more about PottertonBoiler efficiency ratings
RavenheatLearn more about RavenheatBoiler efficiency ratings
VaillantLearn more about VaillantBoiler efficiency ratings
ViessmannLearn more about ViessmannBoiler efficiency ratings
VokèraLearn more about VokèraBoiler efficiency ratings
WarmflowLearn more about WarmflowBoiler efficiency ratings
Worcester BoschLearn more about Worcester BoschBoiler efficiency ratings
ZanussiLearn more about ZanussiBoiler efficiency ratings

Get 3 Quotes

We recommend you get 3 quotes from local and national installers. This will not only give you a good feel for the price you should be paying but will also enable you to assess their professionalism and knowledge against each other. Use boiler quotation services such as that offered by Boiler Guide to contact local heating engineers on your behalf.

Get FREE Boiler Quotes Now

Find professional heating engineers in your local area

Get Free Quotes Now

Bear in mind nationwide firms may be a little more expensive but often provide comprehensive after sales service and support packages.

Be Prepared

Before the engineer arrives to inspect your home be prepared. The engineer should ask you some important questions about your lifestyle and current system. This will enable correct specification of the boiler and central heating system. For more information about the type of system you may have in your home, check out our guide to central heating systems.

Have a think about

  • Where the new boiler will be sited. New condensing boilers produce a plume of steam due to the lower temperature of the exhaust gas from the flue compared to older type boilers. This plume can be a nuisance for you and your neighbours so it’s worth considering the implications of siting the flue in the same location. The engineer will be able to help with this but bear in mind it may be an issue.
  • Your living habits. For example, is there potential for more than one shower to be used at any one time and how well your current boiler copes with demand.
  • Future plans. Do you have any plans to extend your house or convert the loft? Regular boilers require loft space for feed and expansion tanks, System and Combi boilers don’t.
  • Your budget. Know your budget, don’t be persuaded to spend more than you are comfortable with. It may be worth checking out any finance deals on offer.



British Gas new boiler offer

Consider Solar

Modern solar technology may not be as expensive an option as you may think. Most boiler manufacturers also make solar systems that work seamlessly with their own boiler and controls.

Up to 1/3 of your hot water can be gained through solar thermal and combining this with a new boiler installation can be far cheaper than adding it at a later date, it will also add a great deal of value to your property. Government grants are available and solar systems attract just 5% VAT so it’s well worth discussing this with your engineer.

Other Energy Efficiency Options

It’s important to assess the energy efficiency of your home alongside the boiler installation. Supplementing loft insulation or installing cavity wall insulation can be a relatively low cost way to further reduce heating bills and ensure your boiler is working to its maximum efficiency.

Questions to Ask

Don’t be afraid to ask some questions, the engineer will be used to ones below being asked regularly and should be able to give straightforward, honest answers. If he can’t, ask why?

  • Ensure they are Gas Safe (for gas) or OFTEC (for oil) registered.
  • Ask them to provide local referrals.
  • What else is included? After sales service? (see below)
  • Ask for a full written quote itemising all work and parts.
  • What make and efficiency of boiler? Ensure this is specified within the quote.

After Sales Service

It’s essential to establish the after sales service/support the installer is offering. Some installers may be very competent at specifying and installing systems but are they able to repair them? Surprisingly not all have the knowledge to fault find and diagnose problems on the new breed of hi-tech condensing boilers.

Be sure to check their credentials preferably going with a firm that is qualified by the manufacturer to install that make of boiler.

Most of the nationwide installers offer ongoing boiler service and boiler insurance plans. British Gas for example include a years free British Gas HomeCare with all their boiler and central heating installations, this package not only covers the boiler and controls but the whole central heating system, even if it wasn’t installed by British Gas. Well worth considering.

Get FREE Boiler Quotes Now

Find professional heating engineers in your local area

Get Free Quotes Now

  • Know your budget
  • Think of future needs
  • Ask questions
  • After sales service?
  • Get 3 quotes
  • Cheapest is not always best

Selecting the Supplier

Once you have all the quotes in go through them carefully, ensuring you’re comparing apples for apples. Check that they are offering comparable makes and models of boiler. Ensure the outputs and efficiencies of all boilers are similar, if not, question why.

Remember, it’s not all about price but the full package on offer, including the ongoing maintenance.

*Source: Figures based on installing a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas-heated home from an older boiler with a programmer and room thermostat. Based on fuel prices as of April 2018 for a detached house.

Post navigation


A faulty boiler can be a serious hazard. Any heating system, which runs on wood or fossil...

Post navigation


A viable alternative to conventional radiator style central heating systems is underfloor...

British Gas Spring Boiler Offer

Save up to £215 a year with a new boiler from British Gas.

Help-Link New Boiler Offer

Pay monthly boilers from as little as £7.23 a month*

British Gas HomeCare Offer

Get a Gift Card worth up to £50 with selected HomeCare products.


British Gas Boiler Offer