How much does a new boiler cost in 2020? | A Helpful Guide
The initial price for a brand new boiler will land anywhere between £500 and £2,500, but this will only include the boiler itself.
There are many deciding factors to consider before landing on a final figure. It doesn’t have to feel like climbing Mt. Everest when you’re trying to work this out!
What is the usual cost for a new boiler installation?
It depends on your needs. There are many reasons why you might be dealing with this situation. Your boiler may have stopped working in the cold weather, or it’s perfectly operational and you’re just planning ahead. Either way, you can’t go wrong with the research.
Should I replace my boiler?
Every boiler loses efficiency over time, but some drop faster than others depending on the manufacturer. If your boiler’s costing you money because of poor efficiency, you’ll need to get a replacement. The cost of a new boiler can be intimidating, but if you choose to go with constant repairs instead, you’ll lose whatever you’ll have saved to poor efficiency, which is nothing but a big waste.
A brand new, modern, high efficiency condensing boiler can save you from to £200 to £400 per year, so a replacement boiler should be an easy choice.
There are two main types of boiler installations:
- Like for like swaps – Replacing a boiler with another of the same type
- Complete change or system upgrade – Replacing your current boiler or system with a new type
How much is a new combi boiler?

What is a combi boiler?
Combi is short for ‘combination’. They have this name because they combine heating and DHW (Domestic Hot Water) in one compact, unit. They’re different to regular (open vent) or system boilers because they don’t need a cold water storage tank in the attic or a hot water cylinder. Essentially, you get hot water as it’s needed.
REMEMBER: Every modern boiler built in the last 12-15 years, regardless of boiler type, is a condensing boiler.
Further Information on Combi Boilers:
Combi Boiler Prices
BRAND | MODEL | OUTPUT (KW) | PRICE | FUEL |
---|---|---|---|---|
Viessmann | Vitodens 100-W Combi | 26 | £1,017.98 (inc VAT) | Gas/LPG |
Worcester Bosch | Greenstar 25i Combi | 25 | £935.15 (inc VAT) | Gas/LPG |
Vaillant | ecoTEC pro Combi | 24 | £969.98 (inc VAT) | Gas/LPG |
Grant | VortexBlue Floor Standing Combination Boiler Oil ErP | 36 | £2,764.99 (inc VAT) | Oil |
Viessmann | Vitodens 050-W | 29 | £807.11 (inc VAT) | Gas/LPG |
How much is a new regular boiler?
They include a cold water storage tank kept in the attic, and a hot water cylinder – usually kept in your airing cupboard.
Regular boilers get their water supply from the mains, which gets heated and stored in the hot water cylinder. The immediate availability of hot water because of this makes them a perfect choice for larger properties with more than 2 bathrooms. Regular boilers are a great option if there’s a higher demand for water across many taps and showers.
Regular Boiler Prices
BRAND | MODEL | OUTPUT (KW) | PRICE | FUEL |
---|---|---|---|---|
Viessmann | Vitodens 100-W Compact Regular | 26 | £954.96 (inc VAT) | Gas/LPG |
Worcester Bosch | Greenstar 24Ri Regular Boiler | 24 | £932.56 (inc VAT) | Gas |
Vaillant | ecoTEC Plus 424 Regular | 24 | £1,030.98 (inc VAT) | Gas |
Grant | VortexBlue 26kw Kitchen/Utility Floor Standing Regular Boiler Oil ErP | 36 | £1,793.98 (inc VAT) | Oil |
Viessmann | Vitodens 050-W | 29 | £954.96 (inc VAT) | Gas/LPG |
How much is a new system boiler?
The cost of new system boiler by itself can vary, but will land somewhere between £500 and £1,500. A system boiler installation will need extra features and services to ensure success.
What is a system boiler?
It’s easy to get system boilers and regular boilers confused, because they both need a hot water cylinder. A system boiler is a closed system, with no need for a cold water storage tank in the attic, saving a lot on space. System boilers are capable of supplying hot water to many outlets at the same time.
System Boiler Prices
BRAND | MODEL | OUTPUT (KW) | PRICE | FUEL |
---|---|---|---|---|
Viessmann | Vitodens 100-W System Boiler | 26 | £1,077.98 (inc VAT) | Gas/LPG |
Ideal | Independent 24KW System Boiler | 24 | £872.98 (inc VAT) | Gas |
Vaillant | ecoTEC Plus 624 System Boiler | 24 | £1,220.98 (inc VAT) | Gas |
Grant | VortexBlue 26kw Kitchen/Utility Floor Standing Regular Boiler Oil ErP | 36 | £1,997.98 (inc VAT) | Oil |
How much is a Regular to Combi Boiler installation?
What’s included in a regular to combi installation?
- Brand New, Modern Condensing Combination Boiler
- Horizontal or Vertical Flue
- Microbubble Deaerator (If the Client Wants it)
- Magnetic Filter
- Limescale Filter
- Boiler Plus Compliant Programmable Thermostat/Internet Enabled Learning Thermostat
- North Facing Weather Compensation
- Chemical Flush & Inhibitor
- Associated Pipe Work
- Extended 7-10 Years Warranties
- Commission & Test to MFI & Complete Benchmark
- Building Regulation Notification with Certification including Landlord Certificates
- Hand Over & Induction on Boiler, Controls & Best Usage
How much is a Sealed System to Combi Boiler Installation?
What’s included in a sealed system to combi installation?
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Brand New, Modern Condensing Combination Boiler
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Horizontal or Vertical Flue
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Microbubble Deaerator [If the Client Wants it]
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Limescale Filter
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Boiler Plus Compliant Programmable Thermostat/Internet Enabled Learning Thermostat
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Chemical Flush & Inhibitor
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Associated Pipe Work
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Extended 7-10 Years Warranties
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Commission & Test to MFI & Complete Benchmark
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Building Regulation Notification with Certification including Landlord Certificates
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Hand Over & Induction on Boiler, Controls & Best Usage
How much is an old combi to new combi installation?
What’s included in an old combi to new combi installation?
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Brand New, Modern Condensing Combination Boiler
-
Horizontal or Vertical Flue
-
Microbubble Deaerator [If the Client Wants it]
-
Limescale Filter
-
Boiler Plus Compliant Programmable Thermostat/Internet Enabled Learning Thermost
-
Chemical Flush & Inhibitor
-
Associated Pipework
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Registration of Extended 7-10 Years Warranties
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Commission & Test to MFI & Complete Benchmark
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Building Regulation Notification with Certification including Landlord Certificates
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Hand Over & Induction on Boiler, Controls & Best Usage
How much is a Back Boiler to New Combi Boiler Installation?
What’s included in a back boiler to new combi installation?
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Brand New, Modern Condensing Combination Boiler
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Horizontal or Vertical Flue
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Microbubble Deaerator [If the Client Wants it]
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Limescale Filter
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Boiler Plus Compliant Programmable Thermostat/Internet Enabled Learning Thermostat
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Chemical Flush & Add an Approved Inhibitor
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Associated Pipe Work to Complete Installation
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Registration of Extended 7-10 Years Warranties
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Commission & Test to MFI & Complete Benchmark
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Building Regulation Notification with Certification including Landlord Certificates
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Hand Over & Induction on Boiler, Controls & Best Usage
How much is Full Central Heating with a New Combi Boiler?
What’s included in a full central heating and new combi boiler installation?
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Brand new Condensing Combi Boiler
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Horizontal or Vertical Flue
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Magnetic Filter
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Microbubble Deaerator [If the Client Wants it]
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Limescale Filter [If Required]
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Boiler Plus Wireless Digital Programmable Thermostat/Internet Enabled Learning Thermostat
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North Facing Weather Compensation [If workable]
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New Gas Run
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Radiators
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TRV (Thermostatic Radiator Valves)
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Lock-Shield Radiator Valves
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Chemical Flush & Inhibitor
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All Associated Pipe Work
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Registration of Extended 7-10 Year Warranties
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Commission & Test to MFI & Completion of Benchmark
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Building Regulation Notification with Certification including Landlord Certificates
-
Hand Over & Induction on Boiler, Controls & Best Usage
What’s included in a new boiler installation?
1. Magnetic Filter
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Reduced energy bills
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Drastic improvement to your boiler’s efficiency
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Reduced likelihood of frequent/expensive repairs
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Extension of boiler’s lifespan
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Reduction of carbon footprint
2. Hardwater Filter
3. Power Flush/Chemical Flush
What is a chemical flush?
What is a power flush?
5. Boiler Size/kW Rating
6. Upgraded heating controls

7. Gas Upgrade

8. Flue Position
In most properties, it’s more common for a boiler flue to exit the building horizontally.
9. Condensate Pump
10. Additional Scaffolding

11. Additional unplanned work
12. Boiler Suppliers And Warranty Choices
Which Boiler Brand and Installer Should I Choose?
Are Viessmann the best boiler manufacturer?
As a whole, the German manufacturer Viessmann has truly raised the bar in terms what it brings to its customers. Want to know why Viessmann stands above other manufacturers like Worcester Bosch, Vaillant and Ideal? Here are a few key points:
- Recipient of Which? Best Buy title for for 2017-2019
- Excellent efficiency (94-98%), reliability and durability
- Utilises a patented Inox-Radial Stainless Steel Heat Exchanger (Unique in the UK)
- Extended 7-10 Year Warranties available if installed by Premium Viessmann Installer Boilerhut
- Competitors such as Worcester Bosch use Aluminium for their heat exchangers, meaning longevity it greatly decreased
- Widest Range of Domestic Gas Boilers in the UK
- Combined PRV (Pressure Release Valve) and Condensate
- Helpful Articles, Boiler Reviews and Comparisons. Free Advice on Central Heating.
I want the best boiler installer as well…why choose Boilerhut?

- Hundreds of 5-star Trustpilot reviews written directly by our customers
- Our intelligent quoting tool can give you a a free, no-obligation quote in minutes
- Excellent prices for top-quality products, including finance options
- Boiler care plans available to ensure your boiler’s lifespan is extended
- Extended 7-10 Year Warranties
- Quote is finalised on the same day to ensure installation is followed up within days, not weeks.
- Only the Most Experienced, Highest Quality Gas Safe Engineer are recruited
- PAS 2030 Accredited Company with Quality Management Best Practices
- Excellent After-Sales Customer Support
- Helpful articles, boiler reviews and comparisons. Free advice on central heating.
Boilerhut – A Premium Viessmann Installer
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Send an email through to sales@boilerhut.co.uk with your queries
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Call 029 2009 989 to speak to a heating expert directly
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Great explanation on boiler costs. Many people tend to forget that there are other costs involved while installing the boiler. We too have written a similar article on our blog( here: https://www.aquatek.info/new-boilers-cost-guide/) thought it was relevant to the guide so posted it.