System Boiler Price Comparison

System boilers are similar to heat-only boilers, they work off the principle of stored hot water. A system boiler heats your radiators directly and produces hot water for your water cylinder. One of the biggest differences between system and heat-only boilers is that system boilers are easier to install than heat-only boilers, so often less expensive as many of the components are built into the boiler itself.

Another way in which a system boiler varies from a heat-only, is that the hot water is pumped directly from the boiler itself, meaning it results in a faster response and usually more economical in terms of running costs. Installation of a heat-only boiler would also include fitting of a feed and expansion cistern.

System boilers, how do they work?

Are you looking at purchasing a brand new system boiler? It could be useful to know how the boiler actually works. There is a sealed hot water cylinder & radiators taht the system pumps hot water through. Usually homes that require a system boiler are ones which already have a traditional heating system in place, due to the extra requirements of a hot water cylinder.

Most system boilers are installed onto an unvented high-pressure system, this means that you don’t need extra boiler facilities that you would with a heat-only boiler, saving you space. The combination of boiler and cylinder also means that you can run more than one tap at the same time without your boiler losing pressure.

System boiler price range (£521-£1,456.68*)

If you are looking for a system boiler then there are loads of different options to choose from. There are system boilers of all shapes and sizes as well as having several different brands to choose from including Worcester Bosch, Glow-worm, Ideal, Baxi & more.

Prices of system boiler vary, value boilers or a premium boiler. The Vokera Mynute i20 system boiler is considered a value boiler, priced at £521. This model has an output of 20kW so is typically best suited to a small home with up to 3 bedrooms and one bathroom. The Vitodens 200-W is a system model manufactured by Viessmann which is considered a premium brand, with 26kW output to heat, this boiler is priced at £1,456.68.

Why choose a System boiler

Does your current central heating system require a cylinder for storing hot water? Then a system boiler could be the right choice for you. Here are a few positive points to help you make an informed decision.

Typically ideal for properties with several bathrooms

Supply of hot water is constant to any number of taps at the same time

No need for an extra tank in the loft

Economical to run

Generally cleaner and more efficient than heat-only boilers as there’s no need for an expansion tank

It could be cheaper to swap a like for like system boiler than to change boiler type

Compare system boiler prices

BrandModel NameTypeFuelkWWarrantyExample Price*
(Including VAT)
VokeraMynute i20SystemGas20kw2£521
VokeraVision 20sSystemGas20kw7£545
VokeraVision 25sSystemGas25kw7£581
PottertonGold 18SystemGas18kW2£588.65
BiasiAdvance Plus ERP 25SystemGas25kW5£594
VokeraMynute i30SystemGas30kw2£596
PottertonGold 24SystemGas24kW2£612.55
BiasiInovia System ERP 25SystemGas25kW5£624
IdealIndependent 15SystemGas15kW5£624.24
FerroliModena HE 18sSystemGas18kW5£628.56
PottertonGold 28SystemGas28kW2£633.36
FerroliModena HE 25sSystemGas25kW5£647.85
BiasiAdvance Plus ERP 30SystemGas30kW7£659.99
IdealIndependent 18SystemGas18kW5£663.62
IdealIndependent 24SystemGas24kW5£710.86
FerroliModena HE 32SSystemGas32kW5£716.78
IdealLogic Plus 15SystemGas15kW7£720.22
Glow-WormEnergy 12SystemGas12kW2£734.69
AristonClas HE Evo 18SystemGas18kW5£750
IdealIndependent 30SystemGas30kW5£750.2
Glow-WormEnergy 15SystemGas15kW2£753.22
IdealLogic 15SystemGas15kW2£771.76
Glow-WormEnergy 18SystemGas18kW2£781.31
AristonE-System OneSystemGas30kW2£793.95
AristonClas HE Evo 24SystemGas24kW5£799
IdealLogic 15SystemGas15kW2£803.81
IdealLogic 18SystemGas18kW2£804.83
PottertonPromax System 12SystemGas12kW2£825.77
IdealLogic Plus 15SystemGas15kW7£827.83
IdealLogic Plus 18SystemGas18kW7£831.95
Glow-WormEnergy 25SystemGas25kW2£833.88
IdealLogic 24SystemGas24kW2£839
IdealLogic 18SystemGas18kW2£839.38
BaxiMegaflo System 15SystemGas15kW7£843.18
VaillantecoFIT pure 612SystemGas12kW2£844.24
IdealVogue 15SystemGas15kW8£850.03
VaillantecoTec plus 612SystemGas12kW5£850.52
VokeraMynute 35 HESystemGas35kW2£850.61
Glow-WormEnergy 30SystemGas30kW2£859.6
IdealLogic Plus 18SystemGas18kW7£860.76
IdealLogic 30SystemGas30kW2£872.09
IdealLogic 24SystemGas24kW2£874.76
IdealLogic Plus 24SystemGas24kW7£892.56
VaillantecoTec plus 615SystemGas15kW5£893.79
PottertonPromax System 24SystemGas24kW1£897.5
IdealLogic Plus 24SystemGas24kW7£899.24
VaillantecoFIT pure 615SystemGas15kW2£901.66
IdealLogic Plus 30SystemGas30kW7£906.41
IdealLogic System 30SystemGas30kW2£910.24
BaxiEcoBlue System 12SystemGas12kW5£912.82
IdealVogue 18SystemGas18kW8£919.49
IdealLogic Plus 30SystemGas30kW7£924.36
Worcester-BoschGreenstar 9iSystemGas9kW5£931.32
BaxiEcoBlue System 15SystemGas15kW5£934.79
Worcester-BoschGreenstar 12iSystemGas12kW5£947.34
BaxiMegaflo System 24SystemGas24kW7£958.29
BaxiEcoBlue System 18SystemGas18kW5£974.72
VaillantecoFIT pure 618SystemGas18kW2£976.97
VaillantecoTec plus 618SystemGas18kW5£989.15
BaxiMegaflo System 28SystemGas28kW7£990.69
Worcester-BoschGreenstar 15iSystemGas15kW5£1001.19
BaxiMegaflo System 32SystemGas32kW7£1015.56
IdealVogue 26SystemGas26kW8£1033.03
ViessmannB1HC Vitodens 100-W 19SystemGas19kW5£1033.16
IdealVogue S15 Gen2SystemGas15kW8£1038.19
Worcester-BoschGreenstar 18iSystemGas18kW5£1047.53
BaxiEcoblue 24SystemGas24kW5£1066.68
ViessmannB1HC Vitodens 100-W 26SystemGas26kW5£1068.04
Worcester-BoschGreenstar 21iSystemGas21kW5£1077.7
IdealVogue 32SystemGas32kW8£1099.5
ViessmannB1HC Vitodens 100-W 30SystemGas30kW5£1100.28
BaxiEcoblue 28SystemGas28kW5£1100.81
Worcester-BoschGreenstar 24iSystemGas24kW5£1110.78
VaillantecoFIT pure 625SystemGas25kW2£1115.9
Worcester-BoschGreenstar 27iSystemGas27kW5£1116.48
Worcester-BoschGreenstar 30iSystemGas30kW5£1118.45
Worcester-BoschGreenstar 30CDi ClassicSystemGas30kW5£1120.56
IdealVogue S18 Gen2SystemGas18kW8£1130.64
VaillantecoTEC Plus 624SystemGas24kW5£1131.17
BaxiEcoblue 32SystemGas32kW5£1151.72
ViessmannB1HC Vitodens 100-W 35SystemGas35kW5£1152.93
IdealVogue S26 Gen2SystemGas26kW8£1159.56
VaillantecoTEC Plus 630SystemGas30kW5£1207.78
VaillantecoTEC Pure 630SystemGas30kW2£1210.46
IdealVogue S32 Gen2SystemGas32kW8£1240.94
Worcester-BoschGreenstar 35CDiSystemGas35kW5£1259.04
VaillantecoTEC Plus 637SystemGas37kW5£1372.65
VaillantecoTEC 627SystemGas27kW5£1423.37
ViessmannVitodens 200-WSystemGas26kW3£1456.68
Worcester-BoschGreenstar Danesmoor Utility 18-25SystemOil18-25kW2£1956
Worcester-BoschGreenstar Danesmoor Kitchen 25-32SystemOil25-32kW2£2175.99
Worcester-BoschGreenstar Danesmoor External 18-25SystemOil18-25kW2£2185.79
Worcester-BoschGreenstar Danesmoor Utility 25-32SystemOil25-32kW2£2409.65
Worcester-BoschGreenstar Danesmoor External 25-32SystemOil25-32kW2£2749.35

System boiler installation costs

Having a new system boiler installed can vary in cost depending on a number of factors such as the type of boiler and central heating system you currently have. The best way to determine the most suitable boiler is to have a professional surveyor visit your house to assess your current system, requirements for installation and your central heating and hot water needs.

Installation costs may increase for any of the following reasons:

• Extra parts required as part of the installation

• Moving the location of the water tanks or your boiler

• Replacing your boiler with a different boiler type will require additional labour

• Some system boilers can be more complicated to install than others, requiring additional time and labour**

What system boiler do I need in my house?

When choosing a boiler one of the most important things that you need to look at is the kW output. The kW output determines how the boiler is able to cope with the demands of hot water for your home, which is determined by the amount of radiators & bathrooms that you have in your home.

We have put together a guide to help you determine what kW output boiler may be suitable for your property:

24-27kW28-34kW35-42kW
1-2 bedroom3-4 bedroom4+ bedrooms
10 radiators15 radiators20 radiators
1 bathroom1-2 bathrooms2+ bathrooms

(This information has been supplied by Help-Link UK limited and has been produced for information purposes only and should not be used or relied upon as a substitute for professional advice by a suitably qualified engineer.)

* Prices correct as of 3rd September 2018 from the list of suppliers

** The above list is not exhaustive and may not have considered all factors.