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Home / Home Improvements / Boilers / Gas Boilers
  • Ideal
  • Ferroli
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  • Potterton
  • Worcester

Gas Boiler:

Are you thinking about getting a brand new combi boiler for your home to keep it nice and warm in winter? Gas boilers are one of the most significant investments that you can make when you’re improving your home. If you’ve never had new one installed before or it’s been a long time since you last replaced your gas boiler, what is it that you need to know to make the right choice for your household?

  • Gas boilers are normally fuelled by natural gas although LPG is another option available in locations that do not have a mains gas supply.
  • A gas boiler is usually used to heat water that comes out of taps in your bathroom, kitchen and cloakroom and to provide hat water for your central heating radiators in your home to keep you warm.

Types of Gas Boiler

There are different types of gas boiler such as the

Combi boiler installation prices

When budgeting for your replacement combi boiler, here’s a general range of prices to give you a good idea of just how much you’ll need to save up:

On your quote Range of prices
The cost of your boiler £625-£6,190
Boiler installation cost £630-£780
Cost of moving pipes £190-£310
Mechanical flush before installation £440-£535
TOTAL £1,885-£7,815

As you can see, there’s a really wide variation between the bottom price and the top price. That variation is caused mainly by the cost of the boiler you choose. Please do bear in mind that most homeowners will choose a combi boiler which costs them between £625 and £1,250 so you should expect to pay no more than £1,885 to £2,500 when you factor in installation charges.

In addition, mechanical flushes are only needed when you’re replacing a very old boiler system. What that means, in probably 85% or more of installations, is that you won’t need to budget the £440 to £535 it costs into your calculations.

Later in this article, we’ll look at the other factors that influence the price of a gas combi boiler installation.

Benefits of a new gas boiler

  • A new gas boiler is likely to be more efficient than your old one.
  • More cost effective resulting in you probably being able to save a significant amount of money on your fuel bills every year.
  • It is also possibly going to be more compact than your old one thus taking up less space.

Which gas boiler to choose

There are a number of different key factors that not only influence the price of the boiler you pay but which also influence how suitable the boiler is for your home.

Dimensions – first is the height, the width, and the depth of your boiler. If your replacement combi boiler is going into the same place in your home where it is now, your installer will probably recommend a boiler which is exactly the same size or very close in size. If you’re moving the boiler to a new location in your property, be sure to tell the installer where you want it to go to so that he or she can recommend a boiler which fits comfortably into the place you have in mind.

Flow rate – the flow rate lets you know how many litres of water your combi boiler can handle every minute. The more taps you have around the home, the better it is to have a higher flow rate.

Output – closely connected to the flow rate is the output (measured in kilowatts (kW)). You want your water to be hot when it comes out of the tap or out of the shower. To achieve that, you’ll need a combi boiler that can easily heat up the amount of water that your household generally needs just when it needs it.

Energy efficiency rating – combi boiler technology has come a long way in a few years and they’ve become very energy efficient. “A”-rated boilers use 90% of more of the gas used in heating water for your taps and your radiators with “B”-rated boilers coming close behind at 85-89% utilisation. The more energy efficient your boiler, the lower your gas bills.

What other factors does an installer consider when making a combi boiler recommendation for your home? Of course, every property is different and the people living in these properties have different needs but here’s the general rule of thumb installers use:

  • Small property with up to 10 radiators and 1 bathroom – a combi boiler with 24kW-27kW output
  • Medium-sized property with up to 15 radiators and 2 bathrooms – a combi boiler with 28-34kW output
  • Large property with up to 20 radiators and 2 or more bathrooms – a combi boiler with an output greater than 35kW output.

If you get the right boiler, you’ll benefit every year from sizable savings on your utility bills. Get it wrong and, although you’ll have all the hot water and heating you’ll ever need, you won’t see the savings on what you pay for your gas because your new combi boiler will cost a lot more to run.

Combi Boiler Brands & their Prices

There are six main boiler manufacturers in the UK and installers prefer to work with these big brands because of the quality of the combi boilers they produce and the length of guarantees they offer to clients.

Worcester Bosch combi boiler costs - EE Rating (A)

Established in 1962 and suppliers to Sandringham Estate, Worcester Bosch score very highly on internet review sites with both customers and installers.

Worcester Bosch combi boilers guarantees last between 2 years and 5 years depending on the actual model you choose with your installer.

WORCESTER BOSCH Dimensions Max Flow (litres per min) Max Output Price
Greenstar 25Si 710mm x 400 mm x 330 mm 10.2 25 kW £850
Greenstar 28i Junior 710 mm x 400 mm x 330 mm 11.4 28 kW £855
Greenstar 28CDi Compact 680 mm x 390 mm x 280 mm 11.4 28 kW £975
Greenstar 30Si 710 mm x 400 mm x 330 mm 12.3 30 kW £955
Greenstar 29CDi Classic 760 mm x 440 mm x 360 mm 12.3 29 kW £1,020
Greenstar 32CDi Compact 680 mm x 390 mm x 280 mm 13.1 32 kW £1,085
Greenstar 34CDi Classic 760 mm x 440 mm x 360 mm 14.3 34 kW £1,060
Greenstar Highflow 550CDi 850 mm x 600 mm x 600 mm 14.3 30 kW £2,035
Greenstar 36CDi Compact 680 mm x 390 mm x 280 mm 14.7 36 kW £1,205
Greenstar 38CDi Classic 760 mm x 440 mm x 360 mm 16.4 38 kW £1,275
Greenstar 42CDi Classic 760 mm x 440 mm x 360 mm 17.1 42 kW £1,435
Greenstar Highflow 440CDi 850 mm x 600 mm x 600 mm 20 29 kW £1,710
Greenstar 24i Junior 710 mm x 400 mm x 330 mm 9.8 24 kW £765
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