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Boiler Advice

System Boiler Prices and Installation Costs

System Boiler Prices and Installation Costs

System boiler prices range from around £500 to around £2,500.

This doesn’t include installation or the hot water tank, which a system boiler needs to work.

If you already have a hot water tank, that’s great. If you don’t you will need to add this to any new boiler installation costs.

System Boiler Prices – Should you buy one?

In this guide, we’re going to focus on the system boiler.

We’ll provide you with a quick reminder of the pros and cons of this type of heating solution.

Then we’ll provide you with a comprehensive list of system boiler prices from all the leading manufacturers. 

Now you have all the information you need, all in one place.

Get new boiler quotes online>

System boilers prices pros & cons

All types of boilers have pros and cons, so it’s essential to be aware of what they are and to balance them out with your requirements.

Then we’ll look at new boiler cost further down the page.

If you can’t afford a system boiler installation outright, you can always check out boilers on finance to spread the cost of your boiler.

System Boilers Pros

  • A system boiler can cope when you need hot water from more than one tap at a time. This is because the hot water has already been heated and is currently stored in the hot water cylinder.
  • Unlike a regular heating system, there’s no need for a cold-water tank because the system boiler is able to pull its supply directly from the mains.
  • A system boiler has a built-in pump, meaning it can pull water from the hot water cylinder and quickly deliver it to wherever you need it. That means no waiting around while the water heats up.
  • Solar power systems are compatible with a system boiler if you’re looking to reduce your carbon footprint. The perfect way to reduce your energy bill while reducing the environmental impact. All system boilers are condensing to are highly efficient.

System Boiler Cons

  • Hot water is stored in the tank and so if you need a lot of hot water, all at the same time, then you may need to wait until the tank is refilled before you have a supply of hot water once again.
  • System boilers work best when your hot water usage has some routine or predictability. This then allows a timer to ensure that you have a full tank of hot water to call on when needed.
  • System boilers take up space with their need for a hot water cylinder.
  • It’s essential to ensure that the hot water cylinder is well insulated to prevent the water from cooling down too quickly. Even then, there will be some loss of heat during storage.
  • With more parts to the system, it could be argued that things are more significant potential to go wrong. That means you may need to plan for higher maintenance costs compared to a combination boiler.  If you no longer have a valid warranty, we strongly suggest looking at boiler cover plans to give you peace of mind and avoid hefty and unexpected repair bills.
  • A system boiler needs a water supply with a decent level of pressure, so they’re probably not going to be a good choice for areas with low water pressure. You may also find that you need to upgrade your radiators to cope with the high-water pressure once the water has been heated.

Compare System Boilers Prices

A few thoughts on prices and warranties. The warranties that we’ve listed are all the maximum length of time available, so there may be some qualifying criteria. This might include:

  • Having the boiler installed by the manufacturer’s engineers
  • Registering the warranty within a certain period after installation
  • Ensuring that the boiler is serviced on an annual basis
  • The fitting of a specific filter or adaption

On the pricing, these are guide prices that we’ve identified through our research.

You may find that you can get special offers and promotions to reduce the price further, especially when you buy a fixed-price package with installation.

If you want to replace the back boiler and already have a hot water tank, system boilers can be linked up to this if the hot water cylinder is suitable for use.

You will have to move your actual boiler to somewhere more appropriate in your home, but the savings you will be making will be worth it. Most system boilers can also be used in conjunction with a smart thermostat too to help keep energy bills down.

If you have an older system or require a bit of backup, you can also use immersion heaters with system boilers which can be placed in a hot water cylinder to aid the heating of the hot water.

These can help in rural parts of the country, too if gas or oil boilers are intermittent.


Alpha System Boiler Prices

Boiler ModelWarranty Guide Price
Alpha ProTec Plus 50 System Gas Boiler5 years£980
Alpha ProTec Plus 70 System Gas Boiler5 years£990
Alpha ProTec Plus 90 System Gas Boiler5 years£1,150
Alpha ProTec Plus 115 System Gas Boiler5 years£1,250
Alpha E-TEC 20S System Gas Boiler10 years£785
Alpha E-TEC 30s System Gas Boiler10 years£855
Alpha E-TEC 35s System Gas Boiler10 years£950


Ariston System Boilers Prices

Boiler ModelWarrantyGuide Price
Ariston E-SYSTEM evo 24 System Gas Boiler2 years£675
Ariston E-SYSTEM evo 30 System Gas Boiler2 years£780
Ariston CLAS HE SYSTEM evo 18 System Gas Boiler5 years£710
Ariston CLAS HE SYSTEM evo 24 System Gas Boiler5 years£725
Ariston CLAS HE SYSTEM evo 30 System Gas Boiler5 years£750
Ariston E-System One 24kW Gas Boiler2 years£740
Ariston E-System One 30kW Gas Boiler2 years£795
Ariston Clas System One 18kW Gas Boiler8 years£855
Ariston Clas System One 24kW Gas Boiler8 years£895
Ariston Clas System One 30kw Gas Boiler8 years£1,010


Baxi System Boiler Prices

Boiler ModelWarrantyGuide Price
Baxi 615 15kW System Gas Boiler7 years£875
Baxi 618 18kW System Gas Boiler7 years£890
Baxi 624 24kW System Gas Boiler7 years£1,015
Baxi 818 18kW System Gas Boiler10 years£915
Baxi 824 24kW System Gas Boiler10 years£960
Baxi Megaflo System 15 Gas Boiler7 years£715
Baxi Megaflo System 18 Gas Boiler7 years£745
Baxi Megaflo System 24 Gas Boiler7 years£825
Baxi Megaflo System 28 Gas Boiler7 years£855
Baxi Megaflo System 32 Gas Boiler7 years£945
Baxi Platinum+ 32kW System Gas Boiler10 years£1,030

Firebird System Boilers Prices

Boiler ModelWarrantyGuide Price
Firebird Envirogreen System C20 Internal Oil Boiler2 years£1,555
Firebird Envirogreen System C26 Internal Oil Boiler2 years£1,595
Firebird Envirogreen System C35 Internal Oil Boiler2 years£1,949
Firebird Envirogreen System C44 Internal Oil Boiler2 years£2,175
Firebird Envirogreen Systempac C20 External Oil Boiler2 years£1,859
Firebird Envirogreen Systempac C26 External Oil Boiler2 years£1,910
Firebird Envirogreen Systempac C35 External Oil Boiler2 years£2,395
Firebird Envirogreen Systempac C44 External Oil Boiler2 years£2,555
Firebird Envirogreen Slimline Systempac C20 External Oil Boiler2 years£1,845
Firebird Envirogreen Slimline Systempac C26 External Oil Boiler2 years£1,899
Firebird Envirogreen Slimline Systempac C35 External Oil Boiler2 years£2,349


Glow-worm System Boiler Prices

Boiler ModelWarrantyGuide Price
Glow-worm Energy System 12kW Gas Boiler7 years£695
Glow-worm Energy System 15kW Gas Boiler7 years£720
Glow-worm Energy System 18kW Gas Boiler7 years£759
Glow-worm Energy System 25kW Gas Boiler7 years£780
Glow-worm Energy System 30kW Gas Boiler7 years£849
Glow-worm Ultimate3 25kW System Gas Boiler5 years£729
Glow-worm Easicom3 25s System Gas Boiler3 years£590


Ideal System Boiler Prices

Boiler ModelWarrantyGuide Price
Ideal Logic System S15 Gas Boiler2 years£780
Ideal Logic System S18 Gas Boiler2 years£836
Ideal Logic System S24 Gas Boiler2 years£858
Ideal Logic System S30 Gas Boiler2 years£915
Ideal Vogue GEN2 S15 System Gas Boiler10 years£980
Ideal Vogue GEN2 S18 System Gas Boiler10 years£1,075
Ideal Vogue GEN2 S26 System Gas Boiler10 years£1,145
Ideal Vogue GEN2 S32 System Gas Boiler10 years£1,265
Ideal Logic Max S15 System Gas Boiler10 years£970
Ideal Logic Max S24 System Gas Boiler10 years£1,050
Ideal Logic Max S30 System Gas Boiler10 years£1,085
Ideal Vogue Max S15 System Gas Boiler10 years£1,035
Ideal Vogue Max S18 System Gas Boiler10 years£1,120
Ideal Vogue Max S26 System Gas Boiler10 years£1,200
Ideal Vogue Max S32 System Gas Boiler10 years£1,260
Ideal Logic Plus System S15 Gas Boiler7 years£875
Ideal Logic Plus System S18 Gas Boiler7 years£880
Ideal Logic Plus System S24 Gas Boiler7 years£920
Ideal Logic Plus System S30 Gas Boiler7 years£950


Intergas System Boilers Prices

Boiler ModelWarrantyGuide Price
Intergas Compact HRE SB 18kW System Gas Boiler7 years£780
Intergas Compact HRE SB 24kW System Gas Boiler7 years£870
Intergas Compact HRE SB 30kW System Gas Boiler7 years£950
Intergas Compact HRE SB 40kW System Gas Boiler7 years£1,125


Mistral System Boiler Prices

Boiler ModelWarrantyGuide Price
Mistral Sealed System CS1 20kW Oil Boiler2 years£2,295
Mistral Sealed System CS2 26kW Oil Boiler2 years£2,365
Mistral Sealed System CS3 35kW Oil Boiler2 years£2,695
Mistral Sealed System CS4 41kW Oil Boiler2 years£3,195
Mistral Outdoor Sealed System COD SS1 20kW Oil Boiler2 years£1,600
Mistral Outdoor Sealed System COD SS2 26kW Oil Boiler2 years£1,675
Mistral Outdoor Sealed System COD SS3 35kW Oil Boiler2 years£2,035
Mistral Outdoor Sealed System COD SS4 41kW Oil Boiler2 years£2,150
Mistral Sealed System Non-Condensing S1 20kW Oil Boiler2 yr. parts£1,323
Mistral Sealed System Non-Condensing S2 26kW Oil Boiler2 yr. parts£1,374
Mistral Sealed System Non-Condensing S3 35kW Oil Boiler2 yr. parts£1,482
Mistral Sealed System Non-Condensing S4 41kW Oil Boiler2 yr. parts£1,589
Mistral Outdoor Sealed System Non-Condensing OD SS1 20kW Oil Boiler2 yr. parts£1,492
Mistral Outdoor Sealed System Non-Condensing OD SS2 26kW Oil Boiler2 yr. parts£1,549
Mistral Outdoor Sealed System Non-Condensing OD SS4 41kW Oil Boiler2 yr. parts£1,899
Mistral Outdoor Sealed System Non-Condensing OD SS3 35kW Oil Boiler2 yr. parts£1,699


Potterton System Boilers Prices

Boiler ModelWarrantyGuide Price
Potterton Promax System 12kW Gas Boiler2 years£840
Potterton Promax System 15kW Gas Boiler2 years£932
Potterton Promax System 18kW Gas Boiler2 years£828
Potterton Promax System 24kW Gas Boiler2 years£868
Potterton Promax System 32kW Gas Boiler2 years£959
Potterton Ultra System 12kW Gas Boiler2 years£672
Potterton Ultra System 15kW Gas Boiler2 years£897
Potterton Ultra System 18kW Gas Boiler2 years£1,329
Potterton Ultra System 21kW Gas Boiler2 years£1,319
Potterton Ultra System 24kW Gas Boiler2 years£1,800
Potterton Assure 15kW System Gas Boiler2 years£850
Potterton Assure 18kW System Gas Boiler2 years£889
Potterton Gold 18kW System Gas Boiler2 years£630
Potterton Gold 24kW System Gas Boiler2 years£669
Potterton Gold 28kW System Gas Boiler2 years£799
Potterton Assure 24kW System Gas Boiler2 years£849
Potterton Assure 12kW System Gas Boiler2 years£900


Ravenheat System Boilers Prices

Boiler ModelWarrantyGuide Price
Ravenheat WH System 4-24 26kW Gas Boiler5 years£580
Ravenheat HE98S System Gas Boiler5 years£795
Ravenheat CS System 4-24 26kW Gas Boiler2 years£585


Vaillant System Boiler Prices

Boiler ModelWarrantyGuide Price
Vaillant ecoTEC plus 615 System Gas Boiler10 years£970
Vaillant ecoTEC plus 624 System Gas Boiler10 years£1,229
Vaillant ecoTEC plus 612 System Gas Boiler10 years£895
Vaillant ecoTEC plus 618 System Gas Boiler10 years£1,090
Vaillant ecoTEC plus 630 System Gas Boiler10 years£1,300
Vaillant ecoTEC plus 637 System Gas Boiler10 years£1,530
Vaillant ecoFIT pure 612 system Gas Boiler10 years£895
Vaillant ecoFIT pure 615 system Gas Boiler10 years£985
Vaillant ecoFIT pure 618 System Gas Boiler10 years£1,060
Vaillant ecoFIT pure 625 System Gas Boiler10 years£1,245
Vaillant ecoFIT pure 630 System Gas Boiler10 years£1,220
Vaillant ecoTEC exclusive Green iQ 627 System Gas Boiler10 years£1,385
Vaillant ecoTEC plus 64kW System Gas Boiler5 years£2,692
Vaillant ecoTEC plus 48kW System Gas Boiler5 years£2,278


Viessmann System Boiler Prices

Boiler ModelWarrantyGuide Price
Viessmann Vitodens 200-W B2HE 11kW System Gas Boiler10 years£1,345
Viessmann Vitodens 200-W B2HE 19kW System Gas Boiler10 years£1,485
Viessmann Vitodens 200-W B2HE 25kW System Gas Boiler10 years£1,545
Viessmann Vitodens 200-W B2HE 32kW System Gas Boiler10 years£1,640
Viessmann Vitodens 100-W B1HF 11 kW System Gas Boiler12 years£985
Viessmann Vitodens 100-W B1HF 19 kW System Gas Boiler12 years£990
Viessmann Vitodens 100-W B1HF 26 kW System Gas Boiler12 years£1,092
Viessmann Vitodens 100-W B1HC 32 kW System Gas Boiler12 years£1,169


Vokera System Boiler Prices

Boiler ModelWarrantyGuide Price
Vokera Mynute i20 System Gas Boiler5 years£549
Vokera Mynute i30 System Gas Boiler5 years£615
Vokera Mynute 35HE System Gas Boiler2 years£735
Vokera Vision 20s System Gas Boiler5-7 years£570
Vokera Vision 25s System Gas Boiler5-7 years£610
Vokera Evolve S 18kW System Gas Boiler7 years£440
Vokera Evolve S 24kW System Gas Boiler7 years£519
Vokera Evolve S 30kW System Gas Boiler7 years£640
Vokera Evolve S 35kW System Gas Boiler7 years£685
Vokera Easi-Heat Plus 24S System Gas Boiler5 years£499
Vokera Easi-Heat Plus 30S System Gas Boiler5 years£520


Warmflow System Boilers Prices

Boiler ModelWarrantyGuide Price
Warmflow Agentis Internal System 33kW Oil Boiler5 years£1,725
Warmflow Agentis Internal System 21kW Oil Boiler5 years£1,499
Warmflow Agentis External System 21kW Oil Boiler5 years£1,735
Warmflow Agentis External System 26kW Oil Boiler5 years£1,799
Warmflow Agentis External System 33kW Oil Boiler5 years£1,995
Warmflow Agentis Pro Internal System 21kW Oil Boiler5 years£1,815
Warmflow Agentis Pro Internal System 26kW Oil Boiler5 years£1,880
Warmflow Agentis Pro Internal System 26kW Oil Boiler5 years£1,935
Warmflow Agentis Pro External System 21kW Oil Boiler5 years£1,799
Warmflow Agentis Pro External System 26kW Oil Boiler5 years£2,100
Warmflow Agentis Pro External System 33kW Oil Boiler5 years£2,495


Worcester Bosch System Boilers Prices

Boiler ModelWarrantyGuide Price
Worcester Bosch Greenstar 8000 Style 30kW System Gas Boiler12 years£1,320
Worcester Bosch Greenstar 8000 Style 35kW System Gas boiler12 years£1,440
Worcester Bosch Greenstar 8000 Life 30kW System Gas Boiler12 years£1,230
Worcester Bosch Greenstar 8000 Life 35kW System Gas Boiler12 years£1,350
Worcester Bosch Greenstar 24i System Gas Boiler7 years£1,070
Worcester Bosch Greenstar 12i System Gas Boiler7 years£899
Worcester Bosch Greenstar 9i System Gas Boiler8 years£895
Worcester Bosch Greenstar 15i System Gas Boiler7 years£970
Worcester Bosch Greenstar 18i System Gas Boiler7 years£1,025
Worcester Bosch Greenstar 21i System Gas Boiler7 years£1,029
Worcester Bosch Greenstar 27i System Gas Boiler7 years£1,060
Worcester Bosch Greenstar 30i System Gas Boiler7 years£1,110
Worcester Bosch GB162 50kW System Gas Boiler2 years£2,215
Worcester Bosch GB162 65kW System Gas Boiler2 years£2,645
Worcester Bosch GB162 85kW System Gas Boiler2 years£3,500
Worcester Bosch GB162 100kW System Gas Boiler2 years£3,830
Worcester Bosch Greenstar Danesmoor 12/18 System Oil Boiler2 years£1,759
Worcester Bosch Greenstar Danesmoor 18/25 System Oil Boiler5 years£1,890
Worcester Bosch Greenstar Danesmoor 25/32 System Oil Boiler5 years£2,210
Worcester Bosch Greenstar Danesmoor Utility 12/18 System Oil Boiler5 years£1,735
Worcester Bosch Greenstar Danesmoor Utility 18/25 System Oil Boiler5 years£1,810
Worcester Bosch Greenstar Danesmoor Utility 25/32 System Oil Boiler5 years£2,199
Worcester Bosch Greenstar Danesmoor External 12/18 System Oil Boiler5 years£2,140
Worcester Bosch Greenstar Danesmoor External 18/25 System Oil Boiler2 years£2,295
Worcester Bosch Greenstar Danesmoor External 25/32 System Oil BoilerUp to 5 years£2,650
Worcester Bosch Greenstar 4000 12kW System Gas Boiler10 years£970
Worcester Bosch Greenstar 4000 15 kW System Gas Boiler10 years£999
Worcester Bosch Greenstar 4000 18kW System Gas Boiler10 years£1,095
Worcester Bosch Greenstar 4000 21kW System Gas Boiler10 years£1,045
Worcester Bosch Greenstar 4000 24kW System Gas Boiler10 years£1,095

New system boilers price summary

We compare all the best manufacturers, so if you’re looking for a specific make or model or just browsing, check out our other pages for Viessmann, Worcester Bosch, Baxi, Ideal, Vokera, Vaillant, Alpha, Potterton & more.

You can always click get a quote to get recommended combi boilers, system boilers and regular boilers suited to your home.


Are there additional costs associated with system boiler installation apart from the initial cost?

When installing a system boiler, there are several additional costs to consider beyond the initial purchase price. Firstly, you’ll need to budget for the labour involved in installation, which typically requires the services of a qualified heating engineer or plumber.

Additionally, if your home lacks a hot water cylinder, you’ll need to factor in the cost of purchasing and installing one to complement the system boiler. Furthermore, additional expenses may arise for pipework, fittings, and accessories, depending on the specifics of your heating system layout and installation requirements. Also, Upgrading or installing new heating controls and thermostats may also be necessary, adding to the overall installation cost.

What should be considered when choosing between different system boiler models from various manufacturers?

When choosing between different system boiler models from various manufacturers, it’s important to assess the heating capacity and output of the boiler to ensure it can meet the heating demands of your home. Consider the energy efficiency rating of the boiler, as higher efficiency models can lead to lower energy bills and reduced environmental impact.

Evaluate the warranty and after-sales support offered by the manufacturer, as longer warranties and reliable customer service can provide peace of mind and protection against unexpected repair costs. Additionally, compare the prices of different models and consider the overall value proposition, taking into account factors such as initial purchase price, installation costs, and long-term servicing expenses.

How do system boiler prices compare to other boiler types?

System boiler prices typically fall within a range of £500 to £2,500, excluding installation and the hot water tank necessary for operation. Compared to other boiler types, system boilers often have higher upfront costs due to their inclusion of additional components like the hot water cylinder.

However, despite the initial investment, system boilers can offer long-term savings through their efficiency and ability to provide hot water to multiple taps at once. The absence of a cold-water tank and the built-in pump for quick water delivery contribute to their efficiency. Additionally, system boilers can be compatible with smart home systems for better energy management, further enhancing their potential for long-term savings.

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