System boiler prices vary significantly, starting at approximately £500 and reaching up to £2,500.
It’s important to note that these figures do not cover the cost of installation or the necessary hot water tank for the system boiler to function.
If you already possess a hot water tank, you’re in a good position; otherwise, the cost of acquiring one will add to the total expenses of installing a new boiler.
System Boiler Prices – Should You Consider Buying One?
This guide will concentrate on system boilers, offering a brief overview of their advantages and disadvantages.
Additionally, we will present an extensive list of system boiler prices from leading manufacturers, providing you with all the essential information compiled in one place.
System boilers price 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 Model | Warranty | Guide Price |
| Alpha ProTec Plus 50 System Gas Boiler | 5 years | £980 |
| Alpha ProTec Plus 70 System Gas Boiler | 5 years | £990 |
| Alpha ProTec Plus 90 System Gas Boiler | 5 years | £1,150 |
| Alpha ProTec Plus 115 System Gas Boiler | 5 years | £1,250 |
| Alpha E-TEC 20S System Gas Boiler | 10 years | £785 |
| Alpha E-TEC 30s System Gas Boiler | 10 years | £855 |
| Alpha E-TEC 35s System Gas Boiler | 10 years | £950 |
Ariston System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Ariston E-SYSTEM evo 24 System Gas Boiler | 2 years | £675 |
| Ariston E-SYSTEM evo 30 System Gas Boiler | 2 years | £780 |
| Ariston CLAS HE SYSTEM evo 18 System Gas Boiler | 5 years | £710 |
| Ariston CLAS HE SYSTEM evo 24 System Gas Boiler | 5 years | £725 |
| Ariston CLAS HE SYSTEM evo 30 System Gas Boiler | 5 years | £750 |
| Ariston E-System One 24kW Gas Boiler | 2 years | £740 |
| Ariston E-System One 30kW Gas Boiler | 2 years | £795 |
| Ariston Clas System One 18kW Gas Boiler | 8 years | £855 |
| Ariston Clas System One 24kW Gas Boiler | 8 years | £895 |
| Ariston Clas System One 30kw Gas Boiler | 8 years | £1,010 |
Baxi System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Baxi 615 15kW System Gas Boiler | 7 years | £875 |
| Baxi 618 18kW System Gas Boiler | 7 years | £890 |
| Baxi 624 24kW System Gas Boiler | 7 years | £1,015 |
| Baxi 818 18kW System Gas Boiler | 10 years | £915 |
| Baxi 824 24kW System Gas Boiler | 10 years | £960 |
| Baxi Megaflo System 15 Gas Boiler | 7 years | £715 |
| Baxi Megaflo System 18 Gas Boiler | 7 years | £745 |
| Baxi Megaflo System 24 Gas Boiler | 7 years | £825 |
| Baxi Megaflo System 28 Gas Boiler | 7 years | £855 |
| Baxi Megaflo System 32 Gas Boiler | 7 years | £945 |
| Baxi Platinum+ 32kW System Gas Boiler | 10 years | £1,030 |
Firebird System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Firebird Envirogreen System C20 Internal Oil Boiler | 2 years | £1,555 |
| Firebird Envirogreen System C26 Internal Oil Boiler | 2 years | £1,595 |
| Firebird Envirogreen System C35 Internal Oil Boiler | 2 years | £1,949 |
| Firebird Envirogreen System C44 Internal Oil Boiler | 2 years | £2,175 |
| Firebird Envirogreen Systempac C20 External Oil Boiler | 2 years | £1,859 |
| Firebird Envirogreen Systempac C26 External Oil Boiler | 2 years | £1,910 |
| Firebird Envirogreen Systempac C35 External Oil Boiler | 2 years | £2,395 |
| Firebird Envirogreen Systempac C44 External Oil Boiler | 2 years | £2,555 |
| Firebird Envirogreen Slimline Systempac C20 External Oil Boiler | 2 years | £1,845 |
| Firebird Envirogreen Slimline Systempac C26 External Oil Boiler | 2 years | £1,899 |
| Firebird Envirogreen Slimline Systempac C35 External Oil Boiler | 2 years | £2,349 |
Glow-worm System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Glow-worm Energy System 12kW Gas Boiler | 7 years | £695 |
| Glow-worm Energy System 15kW Gas Boiler | 7 years | £720 |
| Glow-worm Energy System 18kW Gas Boiler | 7 years | £759 |
| Glow-worm Energy System 25kW Gas Boiler | 7 years | £780 |
| Glow-worm Energy System 30kW Gas Boiler | 7 years | £849 |
| Glow-worm Ultimate3 25kW System Gas Boiler | 5 years | £729 |
| Glow-worm Easicom3 25s System Gas Boiler | 3 years | £590 |
Ideal System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Ideal Logic System S15 Gas Boiler | 2 years | £780 |
| Ideal Logic System S18 Gas Boiler | 2 years | £836 |
| Ideal Logic System S24 Gas Boiler | 2 years | £858 |
| Ideal Logic System S30 Gas Boiler | 2 years | £915 |
| Ideal Vogue GEN2 S15 System Gas Boiler | 10 years | £980 |
| Ideal Vogue GEN2 S18 System Gas Boiler | 10 years | £1,075 |
| Ideal Vogue GEN2 S26 System Gas Boiler | 10 years | £1,145 |
| Ideal Vogue GEN2 S32 System Gas Boiler | 10 years | £1,265 |
| Ideal Logic Max S15 System Gas Boiler | 10 years | £970 |
| Ideal Logic Max S24 System Gas Boiler | 10 years | £1,050 |
| Ideal Logic Max S30 System Gas Boiler | 10 years | £1,085 |
| Ideal Vogue Max S15 System Gas Boiler | 10 years | £1,035 |
| Ideal Vogue Max S18 System Gas Boiler | 10 years | £1,120 |
| Ideal Vogue Max S26 System Gas Boiler | 10 years | £1,200 |
| Ideal Vogue Max S32 System Gas Boiler | 10 years | £1,260 |
| Ideal Logic Plus System S15 Gas Boiler | 7 years | £875 |
| Ideal Logic Plus System S18 Gas Boiler | 7 years | £880 |
| Ideal Logic Plus System S24 Gas Boiler | 7 years | £920 |
| Ideal Logic Plus System S30 Gas Boiler | 7 years | £950 |
Intergas System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Intergas Compact HRE SB 18kW System Gas Boiler | 7 years | £780 |
| Intergas Compact HRE SB 24kW System Gas Boiler | 7 years | £870 |
| Intergas Compact HRE SB 30kW System Gas Boiler | 7 years | £950 |
| Intergas Compact HRE SB 40kW System Gas Boiler | 7 years | £1,125 |
Mistral System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Mistral Sealed System CS1 20kW Oil Boiler | 2 years | £2,295 |
| Mistral Sealed System CS2 26kW Oil Boiler | 2 years | £2,365 |
| Mistral Sealed System CS3 35kW Oil Boiler | 2 years | £2,695 |
| Mistral Sealed System CS4 41kW Oil Boiler | 2 years | £3,195 |
| Mistral Outdoor Sealed System COD SS1 20kW Oil Boiler | 2 years | £1,600 |
| Mistral Outdoor Sealed System COD SS2 26kW Oil Boiler | 2 years | £1,675 |
| Mistral Outdoor Sealed System COD SS3 35kW Oil Boiler | 2 years | £2,035 |
| Mistral Outdoor Sealed System COD SS4 41kW Oil Boiler | 2 years | £2,150 |
| Mistral Sealed System Non-Condensing S1 20kW Oil Boiler | 2 yr. parts | £1,323 |
| Mistral Sealed System Non-Condensing S2 26kW Oil Boiler | 2 yr. parts | £1,374 |
| Mistral Sealed System Non-Condensing S3 35kW Oil Boiler | 2 yr. parts | £1,482 |
| Mistral Sealed System Non-Condensing S4 41kW Oil Boiler | 2 yr. parts | £1,589 |
| Mistral Outdoor Sealed System Non-Condensing OD SS1 20kW Oil Boiler | 2 yr. parts | £1,492 |
| Mistral Outdoor Sealed System Non-Condensing OD SS2 26kW Oil Boiler | 2 yr. parts | £1,549 |
| Mistral Outdoor Sealed System Non-Condensing OD SS4 41kW Oil Boiler | 2 yr. parts | £1,899 |
| Mistral Outdoor Sealed System Non-Condensing OD SS3 35kW Oil Boiler | 2 yr. parts | £1,699 |
Potterton System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Potterton Promax System 12kW Gas Boiler | 2 years | £840 |
| Potterton Promax System 15kW Gas Boiler | 2 years | £932 |
| Potterton Promax System 18kW Gas Boiler | 2 years | £828 |
| Potterton Promax System 24kW Gas Boiler | 2 years | £868 |
| Potterton Promax System 32kW Gas Boiler | 2 years | £959 |
| Potterton Ultra System 12kW Gas Boiler | 2 years | £672 |
| Potterton Ultra System 15kW Gas Boiler | 2 years | £897 |
| Potterton Ultra System 18kW Gas Boiler | 2 years | £1,329 |
| Potterton Ultra System 21kW Gas Boiler | 2 years | £1,319 |
| Potterton Ultra System 24kW Gas Boiler | 2 years | £1,800 |
| Potterton Assure 15kW System Gas Boiler | 2 years | £850 |
| Potterton Assure 18kW System Gas Boiler | 2 years | £889 |
| Potterton Gold 18kW System Gas Boiler | 2 years | £630 |
| Potterton Gold 24kW System Gas Boiler | 2 years | £669 |
| Potterton Gold 28kW System Gas Boiler | 2 years | £799 |
| Potterton Assure 24kW System Gas Boiler | 2 years | £849 |
| Potterton Assure 12kW System Gas Boiler | 2 years | £900 |
Ravenheat System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Ravenheat WH System 4-24 26kW Gas Boiler | 5 years | £580 |
| Ravenheat HE98S System Gas Boiler | 5 years | £795 |
| Ravenheat CS System 4-24 26kW Gas Boiler | 2 years | £585 |
Vaillant System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Vaillant ecoTEC plus 615 System Gas Boiler | 10 years | £970 |
| Vaillant ecoTEC plus 624 System Gas Boiler | 10 years | £1,229 |
| Vaillant ecoTEC plus 612 System Gas Boiler | 10 years | £895 |
| Vaillant ecoTEC plus 618 System Gas Boiler | 10 years | £1,090 |
| Vaillant ecoTEC plus 630 System Gas Boiler | 10 years | £1,300 |
| Vaillant ecoTEC plus 637 System Gas Boiler | 10 years | £1,530 |
| Vaillant ecoFIT pure 612 system Gas Boiler | 10 years | £895 |
| Vaillant ecoFIT pure 615 system Gas Boiler | 10 years | £985 |
| Vaillant ecoFIT pure 618 System Gas Boiler | 10 years | £1,060 |
| Vaillant ecoFIT pure 625 System Gas Boiler | 10 years | £1,245 |
| Vaillant ecoFIT pure 630 System Gas Boiler | 10 years | £1,220 |
| Vaillant ecoTEC exclusive Green iQ 627 System Gas Boiler | 10 years | £1,385 |
| Vaillant ecoTEC plus 64kW System Gas Boiler | 5 years | £2,692 |
| Vaillant ecoTEC plus 48kW System Gas Boiler | 5 years | £2,278 |
Viessmann System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Viessmann Vitodens 200-W B2HE 11kW System Gas Boiler | 10 years | £1,345 |
| Viessmann Vitodens 200-W B2HE 19kW System Gas Boiler | 10 years | £1,485 |
| Viessmann Vitodens 200-W B2HE 25kW System Gas Boiler | 10 years | £1,545 |
| Viessmann Vitodens 200-W B2HE 32kW System Gas Boiler | 10 years | £1,640 |
| Viessmann Vitodens 100-W B1HF 11 kW System Gas Boiler | 12 years | £985 |
| Viessmann Vitodens 100-W B1HF 19 kW System Gas Boiler | 12 years | £990 |
| Viessmann Vitodens 100-W B1HF 26 kW System Gas Boiler | 12 years | £1,092 |
| Viessmann Vitodens 100-W B1HC 32 kW System Gas Boiler | 12 years | £1,169 |
Vokera System Boiler Prices
| Boiler Model | Warranty | Guide Price |
| Vokera Mynute i20 System Gas Boiler | 5 years | £549 |
| Vokera Mynute i30 System Gas Boiler | 5 years | £615 |
| Vokera Mynute 35HE System Gas Boiler | 2 years | £735 |
| Vokera Vision 20s System Gas Boiler | 5-7 years | £570 |
| Vokera Vision 25s System Gas Boiler | 5-7 years | £610 |
| Vokera Evolve S 18kW System Gas Boiler | 7 years | £440 |
| Vokera Evolve S 24kW System Gas Boiler | 7 years | £519 |
| Vokera Evolve S 30kW System Gas Boiler | 7 years | £640 |
| Vokera Evolve S 35kW System Gas Boiler | 7 years | £685 |
| Vokera Easi-Heat Plus 24S System Gas Boiler | 5 years | £499 |
| Vokera Easi-Heat Plus 30S System Gas Boiler | 5 years | £520 |
Warmflow System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Warmflow Agentis Internal System 33kW Oil Boiler | 5 years | £1,725 |
| Warmflow Agentis Internal System 21kW Oil Boiler | 5 years | £1,499 |
| Warmflow Agentis External System 21kW Oil Boiler | 5 years | £1,735 |
| Warmflow Agentis External System 26kW Oil Boiler | 5 years | £1,799 |
| Warmflow Agentis External System 33kW Oil Boiler | 5 years | £1,995 |
| Warmflow Agentis Pro Internal System 21kW Oil Boiler | 5 years | £1,815 |
| Warmflow Agentis Pro Internal System 26kW Oil Boiler | 5 years | £1,880 |
| Warmflow Agentis Pro Internal System 26kW Oil Boiler | 5 years | £1,935 |
| Warmflow Agentis Pro External System 21kW Oil Boiler | 5 years | £1,799 |
| Warmflow Agentis Pro External System 26kW Oil Boiler | 5 years | £2,100 |
| Warmflow Agentis Pro External System 33kW Oil Boiler | 5 years | £2,495 |
Worcester Bosch System Boilers Prices
| Boiler Model | Warranty | Guide Price |
| Worcester Bosch Greenstar 8000 Style 30kW System Gas Boiler | 12 years | £1,320 |
| Worcester Bosch Greenstar 8000 Style 35kW System Gas boiler | 12 years | £1,440 |
| Worcester Bosch Greenstar 8000 Life 30kW System Gas Boiler | 12 years | £1,230 |
| Worcester Bosch Greenstar 8000 Life 35kW System Gas Boiler | 12 years | £1,350 |
| Worcester Bosch Greenstar 24i System Gas Boiler | 7 years | £1,070 |
| Worcester Bosch Greenstar 12i System Gas Boiler | 7 years | £899 |
| Worcester Bosch Greenstar 9i System Gas Boiler | 8 years | £895 |
| Worcester Bosch Greenstar 15i System Gas Boiler | 7 years | £970 |
| Worcester Bosch Greenstar 18i System Gas Boiler | 7 years | £1,025 |
| Worcester Bosch Greenstar 21i System Gas Boiler | 7 years | £1,029 |
| Worcester Bosch Greenstar 27i System Gas Boiler | 7 years | £1,060 |
| Worcester Bosch Greenstar 30i System Gas Boiler | 7 years | £1,110 |
| Worcester Bosch GB162 50kW System Gas Boiler | 2 years | £2,215 |
| Worcester Bosch GB162 65kW System Gas Boiler | 2 years | £2,645 |
| Worcester Bosch GB162 85kW System Gas Boiler | 2 years | £3,500 |
| Worcester Bosch GB162 100kW System Gas Boiler | 2 years | £3,830 |
| Worcester Bosch Greenstar Danesmoor 12/18 System Oil Boiler | 2 years | £1,759 |
| Worcester Bosch Greenstar Danesmoor 18/25 System Oil Boiler | 5 years | £1,890 |
| Worcester Bosch Greenstar Danesmoor 25/32 System Oil Boiler | 5 years | £2,210 |
| Worcester Bosch Greenstar Danesmoor Utility 12/18 System Oil Boiler | 5 years | £1,735 |
| Worcester Bosch Greenstar Danesmoor Utility 18/25 System Oil Boiler | 5 years | £1,810 |
| Worcester Bosch Greenstar Danesmoor Utility 25/32 System Oil Boiler | 5 years | £2,199 |
| Worcester Bosch Greenstar Danesmoor External 12/18 System Oil Boiler | 5 years | £2,140 |
| Worcester Bosch Greenstar Danesmoor External 18/25 System Oil Boiler | 2 years | £2,295 |
| Worcester Bosch Greenstar Danesmoor External 25/32 System Oil Boiler | Up to 5 years | £2,650 |
| Worcester Bosch Greenstar 4000 12kW System Gas Boiler | 10 years | £970 |
| Worcester Bosch Greenstar 4000 15 kW System Gas Boiler | 10 years | £999 |
| Worcester Bosch Greenstar 4000 18kW System Gas Boiler | 10 years | £1,095 |
| Worcester Bosch Greenstar 4000 21kW System Gas Boiler | 10 years | £1,045 |
| Worcester Bosch Greenstar 4000 24kW System Gas Boiler | 10 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.
FAQ’S
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.
