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Combi Boiler Costs: How to Save Money Without Sacrificing Quality

David Jone
Combi Boiler Costs: How to Save Money Without Sacrificing Quality


Installing a new combi boiler can be expensive, with costs quickly mounting up. However, there are ways to get the features and performance you want while staying on budget. This article explores combi boiler cost, tips for saving money, and how to avoid sacrificing quality.

What is a Combi Boiler

A combi, or combination, boiler provides both heating and hot water in a single, compact unit. Combis deliver hot water on demand without needing a bulky cylinder or tank. This makes them an efficient, space-saving option perfect for smaller homes.

Combi Boiler Benefits

Combi boilers offer considerable advantages over traditional boilers:

  • More compact size frees up space
  • No need for water tanks or cylinders
  • Provides hot water instantly whenever you turn on the tap *Generally have a longer life expectancy than conventional boilers
  • Energy efficient, only heating water when required

Combi Boiler Cost Considerations

Several factors affect how much you'll pay to install a new combi boiler:

Upfront Costs

The boiler unit itself starts from £500, ranging up to £2,500 for high-end brands and models. The power output, features, and energy efficiency rating impact the price. More capable, efficient combis cost more.

Installation Costs

. Expect to pay from £500 - £1,000+ for installation. The job complexity, any upgrades needed to pipework or ventilation, and your location influence costs.

Energy Efficiency Rating

The boiler's energy efficiency directly impacts long term spending. models rated A or B cost more initially but waste little gas heating water. Lower rated models are cheaper upfront but pricier to run long-term.


Longer manufacturer warranties bring more peace of mind and indicate better build quality. But extended cover often increases the boiler price. Basic models may just have a 1 or 2-year warranty.

Ways to Save on Combi Boilers

You don't need to break the bank to gain an efficient, quality combi. Here are 5 savvy tips:

Shop Around for Quotes

Get at least 3 installation quotes before deciding. Rates can vary greatly, so shopping around is vital. Let each engineer inspect your home too.

Consider Non-Brand Boilers

Lesser known or own-brand combi boilers can cost much less than big names like Worcester Bosch, Vaillant, or Viessmann. If certifications check out, significant savings are possible.

Have It Installed in Summer/Autumn

Scheduling an off-peak installation for summer or autumn can knock 10-15% off labour fees when demand is lower. Just ensure your old boiler lasts through winter first!

Get a Free Boiler Under Government Scheme

Certain households qualify for government eco-grants, charities and energy company schemes providing free boiler replacements. If eligible, let others cover your boiler cost.

Go For Longer Warranties

Paying slightly more for an extended 5+ year warranty often works out most economical long-term. You'll avoid repair bills during the cover period if problems emerge.

Ensuring You Don't Sacrifice Quality

A cheaper combi boiler makes no sense if it needs endless repairs or wastes energy. Ensure quality with these checks:

Choose a Reputable Manufacturer

Stick to established boiler brands with proven reputations and safety standards. Baxi, Ideal, Vaillant and Worcester Bosch are wise options.

Check Certifications

Look for an independently tested Gas Safe registration and SEDBUK A-rating for efficiency reassurance. These indicate safety, performance and reliability.

Prioritise High Energy Efficiency

As running costs soon outweigh install fees, an A-rated model with low gas usage pays dividends within a couple years through smaller energy bills.


Installing a quality combi boiler doesn't have to devastate your bank balance. Follow the nifty tips and checks above to gain an efficient, reliable boiler tailored to your budget - without sacrificing on quality or features. Saving money is possible with some savoir faire!


Does installing a combi boiler save money?

Yes, as combi boilers only heat water when demanded, they can reduce energy bills by 60% or more versus old-fashioned systems with tanks and cylinders heating water constantly.

What's the best cheap combi boiler?

Baxi and Vaillant offer some of the most reliable budget options. The Baxi 133 combines affordability and performance, while Vaillant's ecoTEC exclusive green models offer high efficiency at reasonable prices.

Should I choose an A-rated energy efficient combi?

In most cases, yes. The higher initial cost is recouped within 2-5 years from energy savings. Plus, greener A-rated combis have less environmental impact over their 15-20 year lifespan.

Where is the cheapest place to install a combi boiler?

Online stores like Boiler Plan, HomeServe, British Gas or So Energy provide some of the most competitive installation quotes. Local plumbers can also offer deals, so get a broad range of quotes.

How long should a combi boiler warranty last?

Look for 5-7 years minimum. Long warranties of 7-10 years indicate the manufacturer has real confidence in build quality and reliability. Check what's covered too, as parts and labour often differ.

David Jone
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