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Last updated: 4th April, 2024


Should You Buy A New Gas Boiler?

Should You Buy A New Gas Boiler?

Are the different types of boilers confusing you? Let us explain exactly what gas boiler is, and whether they are a good option for your home.

What Is A Gas Boiler?

A gas boiler is exactly what it says on the tin, a boiler system that heats gas in order to warm your home.

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The gas initially enters a boiler via the mains or an LPG bottle, the resulting hot water is then fed through the central heating system and can also provide a steady stream of hot water to outlets such as sink, bath etc. Gas can be a fuel for each common UK boiler type:

  • Combi boiler

  • System boiler

  • Heat only boiler

Gas Combi Boilers

Although gas can serve any boiler type, combi boilers are a popular choice for a number of reasons. 

Benefits of Combi Boilers

Combi boilers, unlike conventional boilers, link a home’s central heating system and water heating; no separate hot water tank is needed which is cleaner as it avoids potential rust or debris build up.

Combi systems are also easier to service or for boiler replacement due to their popularity, meaning greater availability.

Are New Gas Boilers Efficient?

For most homes in the UK, the cost of heating and hot water can be a very pricey expenditure, with the Energy Saving Trust suggesting over half a home's monthly financial outgoings are spent in this area.

Therefore ensuring your boiler is as efficient as can be could save you money as well as keep you toasty. Here are some other tips for lowering your heating bill.

A boiler's energy efficiency ‘ErP’ is a rating based simply on the percentage of a system's total energy output that is required for ideal heating. 

Naturally, the newer a gas boiler system, the more efficient due to engineering and design progression.

Outdated or failing systems could be the reason for your shock when seeing your monthly energy bills. Most UK boilers are running at 80% energy efficiency with some antiquated models operating at 60% or less!

These sub optimal levels of output are as avoidable as they are shocking.

Age of Boiler

Efficiency Percentage

Efficiency Rating

0+ Years

90% +


10+ Years

85% +


15+ Years

80% +


20+ Years

70% +


25+ Years

60% +


The direct correlation between boiler age and its efficiency is clear to see in the newer systems’ ErP, so it may be worth upgrading your model to an energy efficient boiler. check out our handy guide on the most energy efficient boilers.

New Gas Boiler in Kitchen

Are Gas Boilers Expensive?

Whether you need a brand new boiler or boiler replacement, this fuel type is very cost effective.

The abundant range of gas boilers available also provides ample opportunity for price comparison to ensure a great deal is found.

Gas Boiler Installation 

As with any new boiler installation cost, there are numerous contributing factors such as brand, size/output and installer rates.

Gas boiler unit and installation prices can range from £1000 to in excess of £2000 for sleek top of the line models.

Running Costs Of Gas Boilers

To the delight of any thrifty boiler buyer, gas is the cheapest boiler fuel and can be up to three times cheaper than some of its alternatives!

Should I Buy A Gas Boiler?

If immediate saving and high efficiency are top of your list for a new boiler then yes, a gas boiler properly sourced can be the best option for cutting down your energy bills.

Gas boilers’ enduring popularity with millions of UK homeowners signals the fuel type’s trusted status in the modern heating industry.

Gas Boiler Thermostat

Buying A Gas Boiler From iHeat

Here at iHeat we want our customers to receive the highest quality products, that's why we stock a wide range of gas boilers.

With next day installation available, up to 10 year warranty, and a price match guarantee, get a free instant quote on our website today!

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Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.