Cost to buy and install new combi or system boilers

See the trade cost for combi & system boilers and how much local heating companies near you will charge for installing your new boiler (whether it is a like for like combi swap or installing a system boiler in a new location).

What are combi boilers?

Combi boilers (combination boilers) are compact small boilers which both heat water directly which comes out of your hot taps and also send hot central heating water to your radiators to heat your home.

How do combi boilers work?

To get your radiators hot the system water in your home's radiators and pipes is circulated using a pump through the combi boiler’s main heat exchanger which is heated by a gas burner.

When you turn on a hot water tap or shower a flow sensor tells the combi boiler’s diverter valve to redirect the heated system water internally through a second ‘plate to plate’ heat exchanger which indirectly heats up mains water and in seconds sends the now hot mains water to your hot tap or shower.

Why are combi boilers so popular?

No space needed for hot water cylinders or water tanks, low cost, range of out-puts to suit all properties, simple to install, maintain - all persuasive reasons why combi boilers are the number one choice when UK homeowners buy a new boiler.

What are system boilers and how do they work?

System boilers are a great solution for large family homes as they provide a constant supply of hot water for baths, showers and washing up. A system boiler works by filling a large, insulated storage cylinder with hot water so there is a constant supply of hot water ready to be used at any time.

 

How much do Worcester Bosch combi boilers cost?

  • Greenstar 2000 Combi boiler (25/30kw) - Suitable for one bathroom small to medium homes, fits between standard kitchen cabinets. Quietest in range, efficient and guarantee ranging from 5 – 6 years.
  • Greenstar 4000 Combi boiler (25/30kw) - Ideal for small to medium homes with one bathroom. Modern design, easy to use colour display, efficient, quiet and guarantee ranging from 7 - 8 years.
  • Greenstar Si Compact Combi boiler (25/30kw) - Suitable for small to medium homes with one bathroom, fits into a standard kitchen cupboard, easy to use controls and guarantee ranging from 7 – 8 years.
  • Greenstar CDi Compact combi boiler (28/32/36kw) - suitable for small, medium and large-sized properties with one or two bathrooms. Compact enough to fit into a standard kitchen cupboard but powerful enough for homes with more than one bathroom. Guarantee ranging from 7 - 8 years.
  • Greenstar 8000 Life Combi boiler (30/35/40/45/50kw) - most powerful wall hung combi boiler range with a modern design, wireless connectivity and guarantee ranging from 8 – 10 years.
  • Greenstar 8000 Style Combi boiler (30/35/40/45/50kw) - Top of the range, look like huge black or white wall hung iPhones, connected technology and power to comfortably heat large homes with two or more bathrooms. Guarantee ranging from 8 – 10 years.

 

Worcester Bosch combi boilers cost (trade ex VAT)
Worcester Bosch Combi Boilers

Boiler Cost

Greenstar 2000 25kw combi £600
Greenstar 2000 30kw combi £700
Greenstar 4000 25kw combi £820
Greenstar 4000 30kw combi £920
Greenstar 25Si Compact Combi £900
Greenstar 30Si Compact Combi £1,000
Greenstar 28CDi Compact Combi £800
Greenstar 30CDi Compact Combi £900
Greenstar 32CDi Compact Combi £1,050
Greenstar 8000 Life 30 Combi £1,040
Greenstar 8000 Life 35 Combi £1,150
Greenstar 8000 Life 40 Combi £1,300
Greenstar 8000 Life 45 Combi £1,550
Greenstar 8000 Life 50 Combi £1,800
Greenstar 8000 Style 30 Combi (Black or White) £1,100
Greenstar 8000 Style 30 Combi (Black or White) £1,200
Greenstar 8000 Style 30 Combi (Black or White) £1,350
Greenstar 8000 Style 30 Combi (Black or White) £1,600
Greenstar 8000 Style 30 Combi (Black or White) £1,850

 

How much do Worcester Bosch system boilers cost?

  • Greenstar 4000 System boiler (12/15/18/21/24kw) - Suitable for one bathroom small to medium homes. Modern design, quiet, easy to use colour display and guarantee ranging from 7 – 8 years.
  • Greenstar I System boiler (27/30kw) - Small but powerful, suitable for small, medium and large homes whilst fitting into a standard kitchen cupboard, easy to use controls and guarantee ranging from 7 – 8 years.
  • Greenstar 8000 Life System boiler (30/35kw) - most powerful wall hung system boiler range with a modern design, wireless connectivity and guarantee ranging from 8 – 10 years.
  • Greenstar 8000 Style System boiler (30/35kw) - Top of the range, look like huge black or white wall hung iPhones, connected technology and power to comfortably heat large homes with two or more bathrooms. Guarantee ranging from 8 – 10 years.

 

New Worcester Bosch system boilers cost (trade ex VAT)

Worcester Bosch System Boilers

Boiler Cost

Greenstar 4000 12kw System

£800

Greenstar 4000 15kw System

£850

Greenstar 4000 18kw System

£880

Greenstar 4000 21kw System

£890

Greenstar 4000 24kw System

£950

Greenstar 27i System

£940

Greenstar 30i System

£980

Greenstar 8000 Life 30 System

£1,060

Greenstar 8000 Life 35 System

£1,180

Greenstar 8000 Style 30 System

£1,150

Greenstar 8000 Style 35 System

£1,250

 

How much do Vaillant combi boilers cost?

  • ecoFIT pure combi (25/30/35kw) - compact to fit in a cupboard so suitable for small homes. Efficient, quiet, smart controls and guarantee ranging from 2-10 years.
  • ecoTEC pro combi (24/28/30kw) - smart boiler for small to medium homes. Full range of thermostat controls (from analogue timers to ySMART app controlled) and 2-10 years guarantee.
  • ecoTEC plus combi (25/32/35/38kw) - high performance, precision control and efficiency suitable for any home and 5-10 years guarantee.
  • ecoTEC Green iQ combi (35/43kw) - best in range for efficiency and control, fully compatible with vSMART app, 85% recyclable and 5-10 years guarantee.

 

New Vaillant combi boilers cost (trade ex VAT)

Vaillant Combi Boilers

Boiler Cost

ecoFIT pure 825 combi

£760

ecoFIT pure 830 combi

£865

ecoFIT pure 835 combi

£970

ecoTEC Pro 24 combi

£850

ecoTEC Pro 28 combi

£950

ecoTEC Pro 30 combi

£1,000

ecoTEC Plus 825 combi

£1,000

ecoTEC Plus 832 combi

£1,100

ecoTEC Plus 835 combi

£1,170

ecoTEC Plus 838 combi

£1,260

ecoTEC Plus 938 combi

£1,400

ecoTEC Green iQ 835 combi

£1,250

ecoTEC Green iQ 843 combi

£1,460

 

How much do Vaillant system boilers cost?

  • ecoFIT pure system (12/15/18/25/30kw) - compact to fit in a cupboard so suitable for small homes. Efficient, quiet, smart controls and 2-10 years guarantee.
  • ecoTEC plus system (12/15/18/24/30/37kw) - high performance, precision control and efficiency suitable for any home and 5-10 years guarantee.
  • ecoTEC Green iQ system (27kw) - best in range for efficiency and control, fully compatible with vSMART app, 85% recyclable and 5-10 years guarantee.

 

Vaillant System Boilers

Boiler Cost

ecoFIT pure 612 system

£730

ecoFIT pure 615 system

£800

ecoFIT pure 618 system

£865

ecoFIT pure 625 system

£1,000

ecoFIT pure 630 system

£1,060

ecoTEC plus 612 system

£780

ecoTEC plus 615 system

£840

ecoTEC plus 618 system

£920

ecoTEC plus 624 system

£1,050

ecoTEC plus 630 system

£1,150

ecoTEC plus 637 system

£1,270

ecoTEC Green iQ 627 system

£1,150

 

Boiler installation steps

There is more to getting a new boiler than choosing a brand, boiler type and then getting a gas safe registered engineer to fit your new boiler to the wall.

  • Powerflush existing system using old boiler to clean out corrosion debris. The existing radiators and pipes will have corrosion debris in them which needs to be cleaned out so it doesn’t clog up the highly efficient low water content (ie very small holes) heat exchanger in your new boiler
  • Remove old boiler – say goodbye to your old faithful boiler (hanky handy for tears). Your old boiler may have been bigger, had pipes running in different directions and so some making good of cabinets or walls may be required.
  • New location or configuration will require adapting pipes, flue to suit new boiler. Different boilers have pipes coming and going from different positions and so some local alignment of pipes and flue may be required.
  • Fit new boiler. The big event….up goes the new shiny white box onto the frame and make all the connections (power supply, gas, mains water in, flow and return pipes, hot water out, flue, pressure relief pipe….anything else?).
  • Recommend extras to customer; corrosion debris filter, limescale inhibitor, smart controls, system corrosion inhibitor, bleed radiators, top up system pressure
  • Commission whole central heating system, explain to customer how to top up pressure, bleed radiators, set timer/thermostat/controls
  • Register new boiler for Gas Safe Register and manufacturer warranty

 

Extra costs to consider when getting a new boiler

Replace radiators £160-320
Add radiators £260-380
Powerflush radiators and pipes £250-800
Fit water tanks £135-180
Fit new central heating pipework £750-1,100
Install thermostat controls £120-250

Estimates for common heating engineer jobs;

JobEstimate
Cost to replace a heating programmer £180
Cost to powerflush a central heating system £500 Visit
New combi or system boiler installation – like for like replacement £500
Cost to fix a boiler fault error code £85
Cost to fit thermostatic radiator valves (TRVs) £94
Cost to fit smart heating controls £100
Cost to fit a radiator £80
Boiler service cost £90
Boiler repair costs (e.g. pump, diverter valve or heat exchanger) £333
Replacement of a vented system £580

Rates for other trades

New boiler installation cost in the UK
New boiler installation cost in the UK (excluding VAT or callout charges)
Location in UKNew boiler installation cost
New boiler installation near Aberdeen£560
New boiler installation near Amber Valley£480
New boiler installation near Angus£540
New boiler installation near Arun£546
New boiler installation near Ashfield£476
New boiler installation near Aylesbury Vale£562
New boiler installation near Barnsley£466
New boiler installation near Basildon£530
New boiler installation near Basingstoke & Deane£546
New boiler installation near Bassetlaw£490
New boiler installation near Bath & North East Somerset£520
New boiler installation near Bedford£560
New boiler installation near Belfast£424
New boiler installation near Birmingham£464
New boiler installation near Blackburn£474
New boiler installation near Blackpool£482
New boiler installation near Bolton£496
New boiler installation near Bournemouth£542
New boiler installation near Bracknell Forest£572
New boiler installation near Bradford£468
New boiler installation near Braintree£520
New boiler installation near Breckland£484
New boiler installation near Bridgend£452
New boiler installation near Brighton£528
New boiler installation near Bristol£506
New boiler installation near Broadland£534
New boiler installation near Broxtowe£474
New boiler installation near Bury£490
New boiler installation near Caerphilly£452
New boiler installation near Calderdale£460
New boiler installation near Cambridge£550
New boiler installation near Canterbury£490
New boiler installation near Cardiff£464
New boiler installation near Carmarthenshire£398
New boiler installation near Charnwood£458
New boiler installation near Chelmsford£518
New boiler installation near Cheltenham£620
New boiler installation near Cherwell£554
New boiler installation near Chester£438
New boiler installation near Colchester£510
New boiler installation near Conway£408
New boiler installation near Coventry£466
New boiler installation near Crewe & Nantwich£468
New boiler installation near Dacorum£560
New boiler installation near Derby£460
New boiler installation near Doncaster£488
New boiler installation near Dover£468
New boiler installation near Dudley£466
New boiler installation near Dumfries & Galloway£504
New boiler installation near Dundee£548
New boiler installation near East Ayrshire£380
New boiler installation near East Devon£494
New boiler installation near East Dunbartonshire£560
New boiler installation near East Hampshire£538
New boiler installation near East Hertfordshire£552
New boiler installation near East Lindsey£438
New boiler installation near East Riding£392
New boiler installation near Eastleigh£560
New boiler installation near Edinburgh£512
New boiler installation near Elmbridge£582
New boiler installation near Epping Forest£586
New boiler installation near Erewash£466
New boiler installation near Exeter£514
New boiler installation near Falkirk£550
New boiler installation near Fife£522
New boiler installation near Flintshire£452
New boiler installation near Gateshead£520
New boiler installation near Gedling£470
New boiler installation near Glasgow£550
New boiler installation near Gloucester£644
New boiler installation near Guildford£592
New boiler installation near Gwynedd£464
New boiler installation near Halton£474
New boiler installation near Harrogate£448
New boiler installation near Havant & Waterloo£532
New boiler installation near Highland£640
New boiler installation near Horsham£536
New boiler installation near Huntingdonshire£542
New boiler installation near Ipswich£606
New boiler installation near Isle of Wight£524
New boiler installation near Kings Lynn & West Norfolk£520
New boiler installation near Kingston-upon-Hull£392
New boiler installation near Kirklees£456
New boiler installation near Knowsley£464
New boiler installation near Lancaster£514
New boiler installation near Leeds£454
New boiler installation near Leicester£462
New boiler installation near Lisburn£422
New boiler installation near Liverpool£464
New boiler installation near London£578
New boiler installation near Luton£572
New boiler installation near Macclesfield£484
New boiler installation near Maidstone£510
New boiler installation near Manchester£478
New boiler installation near Mid Bedfordshire£554
New boiler installation near Mid Sussex£548
New boiler installation near Middlesbrough£490
New boiler installation near Milton Keynes£562
New boiler installation near Neath Port Talbot£468
New boiler installation near New Forest£538
New boiler installation near Newbury£548
New boiler installation near Newcastle-under-Lyme£446
New boiler installation near Newcastle-upon-Tyne£522
New boiler installation near Newport£466
New boiler installation near North Ayrshire£448
New boiler installation near North East Lincolnshire£508
New boiler installation near North Hertfordshire£558
New boiler installation near North Lanarkshire£554
New boiler installation near North Lincolnshire£434
New boiler installation near North Somerset£496
New boiler installation near North Tyneside£518
New boiler installation near North Wiltshire£620
New boiler installation near Northampton£544
New boiler installation near Norwich£520
New boiler installation near Nottingham£460
New boiler installation near Nuneaton & Bedworth£460
New boiler installation near Oldham£486
New boiler installation near Oxford£562
New boiler installation near Pembrokeshire£408
New boiler installation near Perth & Kinross£540
New boiler installation near Peterborough£548
New boiler installation near Plymouth£492
New boiler installation near Poole£540
New boiler installation near Portsmouth£524
New boiler installation near Powys£616
New boiler installation near Preston£490
New boiler installation near Reading£574
New boiler installation near Redcar & Cleveland£472
New boiler installation near Reigate & Banstead£580
New boiler installation near Renfrewshire£530
New boiler installation near Rhondda, Cynon, Taff£430
New boiler installation near Rochdale£484
New boiler installation near Rochester-upon-Medway£560
New boiler installation near Rotherham£474
New boiler installation near Salford£478
New boiler installation near Salisbury£502
New boiler installation near Sandwell£462
New boiler installation near Scarborough£484
New boiler installation near Scottish Borders£740
New boiler installation near Sefton£464
New boiler installation near Sevenoaks£534
New boiler installation near Sheffield£484
New boiler installation near Slough£576
New boiler installation near Solihull£464
New boiler installation near South Ayrshire£454
New boiler installation near South Bedfordshire£560
New boiler installation near South Cambridgeshire£530
New boiler installation near South Gloucestershire£514
New boiler installation near South Kesteven£544
New boiler installation near South Lanarkshire£552
New boiler installation near South Oxfordshire£548
New boiler installation near South Somerset£526
New boiler installation near South Tyneside£518
New boiler installation near Southampton£554
New boiler installation near Southend-on-Sea£512
New boiler installation near St Albans£580
New boiler installation near St Helens£464
New boiler installation near Stafford£472
New boiler installation near Stockport£482
New boiler installation near Stockton-on-Tees£494
New boiler installation near Stoke-on-Trent£446
New boiler installation near Stratford-on-Avon£492
New boiler installation near Stroud£576
New boiler installation near Suffolk Coastal£640
New boiler installation near Sunderland£518
New boiler installation near Swale£504
New boiler installation near Swansea£456
New boiler installation near Tameside£476
New boiler installation near Teignbridge£504
New boiler installation near Tendring£574
New boiler installation near Test Valley£522
New boiler installation near Thamesdown£620
New boiler installation near Thanet£510
New boiler installation near The Wrekin£508
New boiler installation near Thurrock£530
New boiler installation near Torbay£500
New boiler installation near Trafford£484
New boiler installation near Vale of Glamorgan£460
New boiler installation near Vale of White Horse£570
New boiler installation near Vale Royal£448
New boiler installation near Wakefield£466
New boiler installation near Walsall£462
New boiler installation near Warrington£490
New boiler installation near Warwick£480
New boiler installation near Waveney£506
New boiler installation near Waverley£570
New boiler installation near Wealden£540
New boiler installation near West Lancashire£470
New boiler installation near West Lothian£550
New boiler installation near West Wiltshire£620
New boiler installation near Wigan£474
New boiler installation near Windsor & Maidenhead£574
New boiler installation near Wirral£458
New boiler installation near Wokingham£576
New boiler installation near Wolverhampton£464
New boiler installation near Wrexham Maelor£566
New boiler installation near Wychavon£530
New boiler installation near Wycombe£586
New boiler installation near York£456