Eco Happy (Solar Expert)

Published February 8, 2024

Welcome to the most comprehensive and only guide you will need on the cost of a new Worcester Bosch Greenstar 30i. It will generally cost you between £1,995 and £3,500 depending on the type and complication level of the job, and this is just for the installation of the new boiler and controls, additional items such as radiators will move the quote upwards. There are various elements that influence the price of the job such as boiler system type, the fuel the boiler runs on and where you want the new boiler installed.

Our handy guide pulls real time prices from the best boiler installers and gives them a best price ranking taking into account everything included in the job for the price. Sometimes the lowest headline price is not the best price, but we’ve done all the hard work for you so sit back, grab a coffee and choose the best value installer for your new Greenstar 30i – choosing the right installer could save you enough for a week in the sun, so it’s really worth spending 5 minutes reading this guide to make sure you get the best deal

Read this guide to make sure you get the best price!

Worcester Bosch Greenstar 30i

Greenstar 30i Best Price for same location combi swap

The most common job type is replacing an old combi boiler with a new Greenstar 30i combi boiler in the same location with a horizontal flue (the flue runs out from the back of your boiler through the external wall of your house). This will tend to be the cheapest of jobs as it will generally be finished in one day and the only thing the engineer has to do is remove the old boiler and put the new one in the same place.

Overall Best Price: BOXT £2,120

BOXT offer really good value for money on this job. Their headline price isn’t the cheapest on offer as E.on advertise £1,995 (more about why that’s not the best value later) but examining all the extras included within the package you can see why it is outstanding value:

  • 10 year warranty
  • System flush and filter included
  • pipework included
  • Nest 3rd generation learning thermostat included (you can switch this for a Hive or Worcester Bosch equivalent at no extra charge)
  • 120 month 10.9% APR finance available

HomeServe are the most expensive on offer here at £2,727, BOXT are an impressive 28% cheaper – which is £607 left in your pocket!

Best Finance Price: Heatable £2,070

A great headline price plus the option of 2 years 0% APR finance packages to help spread the cost without incurring interest. There are compromises in the package though:

  • additional pipework isn’t included so would be an extra cost
  • wireless controls are included rather than a smart thermostat – you could always upgrade for about £200 extra

But if interest free credit is your priority then this is the package for you. 

Which Best Buy

Price to be wary of: E.on £1,995

The cheapest headline price across all top installers, plus with 3 years 0% APR available the offer looks irresistible, that is until you read the small print:

  • it only includes a 5 year warranty – it’s an extra £150 to extend it to a 10 year warranty
  • pipework isn’t included, so if needed will be an additional charge
  • no thermostat is included in the price – to upgrade to a Tado smart thermostat is an extra £238

Extending the warranty and adding the smart thermostat to make the job like for like with BOXT will cost you £2,383, or £263 more than the same job with BOXT.

Best PriceInstallerNext Day InstallationWarrantySystem FlushFilterPipework IncludedThermostatFinance AvailablePrice
1BOXTYes10 yearsMagnaCleanseAdey MC1+YesNest 3rd Generation10 years 10.9% APR£2,120
2HeatableNo10 yearsAdeyWorcester BoschNoWireless controls2 years 0% APR£2,070
3Clever Energy BoilersNo10 yearsYesNoNoNone1 year Buy Now Pay Later£2,120
4Boiler PlanNo10 yearsNoNoNoHoneywell Lyric T610 years 5.9% APR£2,271
5Hassle Free BoilersNo10 yearsNoNoNoNone10 years 9.9% APR£2,399
6E.onNo5 yearsYesTF1NoNone3 years 0% APR£1,995
7Britsh GasNo5 yearsNoNoNoHive2 years 0% APR£2,578
8Help-LinkNo2 yearsYesSentinel VortexUp to 6cmYes2 years 0% APR£2,727
9HomeServeNo2 years YesSentinel VortexUp to 6cmYes2 years 0% APR£2,727
data correct as of 04-01-2023. online published installation prices Gas Worcester Bosch Greenstar 30i: same boiler location, same system type, horizontal flue

Greenstar 30i Best Price With a Vertical Flue

If your flue goes out of your roof rather than through the wall you have a vertical flue. The only difference in this job is that vertical flues are typically a more expensive part than horizontal flues and can be much more tricky to fit – especially as the installer will need external access to your roof, so they will tend to charge more. We’ve compared published prices of major installers and have found you the bargains and the quotes to avoid if you need a Greenstar 30i combi swap with a vertical flue.

Overall Best Price:  BOXT £2,465

Excellent value again from BOXT and their 2nd Overall Best Price award. They only charge an incremental £345 versus the horizontal flue job, provided your boiler and flue are direct replacements in the same place as the old boiler and flue. 

  • 10 year warranty
  • System flush and filter included
  • pipework included
  • Nest 3rd generation learning thermostat included (you can switch this for a Hive or Worcester Bosch equivalent at no extra charge)
  • 120 month 10.9% APR finance available

BOXT charge a huge £756 LESS than E.on for exactly the same job, that is a 30%!

Best Finance Price: Heatable £2,465

Exactly the same price as BOXT for this job, plus they have the 2 years 0% APR finance on offer. As with the horizontal flue job a little compromise is needed:

  • additional pipework isn’t included so would be an extra cost
  • wireless controls are included rather than a smart thermostat – you could always upgrade for about £200 extra

But an affordable headline price with 2 years interest free credit.

Price to be wary of: E.on £3,221

It looks like E.on really don’t want vertical flue installation jobs as they charge a whopping £1,226 more than for exactly the same job but with a horizontal flue. The same issues also apply when  you look at the detail:

  • it’s an extra £150 to extend the included 5 year warranty to 10 years
  • additioanl pipework for the installation will cost more
  • there’s not a thermostat in the bundle – that costs £238 extra 

Avoid E.on if your flue sticks out of your roof and you need a new combi boiler!

Best PriceInstallerPriceVertical Flue Incremental Cost
1BOXT£2,465£345
2Heatable£2,465£395
3Hassle Free Boilers£2,679£280
4E.on£3,221£1,226
data correct as of 04-01-2023. online published installation prices: same boiler location, same system type, vertical flue

Best Price changing from Conventional Boiler to Greenstar 30i

Many homeowners decide to replace their old conventional boiler with a space saving combi boiler such as the Greenstar 30i, which provides instant hot water convenience plus frees up extra space by removing the hot and cold water tanks. As changing systems is a bigger job, generally takes more time and requires disposal of two water tanks as well as the old boiler it normally costs more. We’ve done all the homework for you and found the best deals.

Best Overall Price: Boiler Plan £2,561

A cracking deal from Boiler Plan saving you a huge £559 than if you chose HomeServe for the job. Plus your get:

  • 10 year warranty
  • Honeywell Lyric T6 thermostat 
  • And 10 years 5.9% APR finance is available 

Best Finance Price: Heatable £2,795

A competitive headline price plus the option of 2 years interest free credit.

Price to be wary of: HomeServe £3,120

22% more expensive than Boiler Plan for exactly the same Worcester Bosch 30i. Pocket the savings!

Best PriceInstallerNext Day InstallationWarrantySystem FlushFilterPipework IncludedThermostatFinance AvailablePrice
1Boiler PlanNo10 yearsNoNoNoHoneywell Lyric T610 years 5.9% APR£2,561
2Clever Energy BoilersNo10 yearsYesNoNoNone1 year Buy Now Pay Later£2,590
3HeatableNo10 yearsAdeyWorcester BoschNoWireless Controls2 years 0% APR£2,795
4BOXTYes10 yearsMagnaCleanseAdey MC1+YesNest 3rd Generation10 years 10.9% APR£2,920
5E.onNo5 yearsYesTF1NoNone3 years 0% APR£2,756
6Hassle Free BoilersNo10 yearsNoNoNoNone10 years 9.9% APR£3,049
7Help-LinkNo7 yearsYesSentinel VortexUp to 6cmYes2 years 0% APR£3,120
8HomeServeNo7 yearsYesSentinel VortexUp to 6cmYes2 years 0% APR£2,727
data correct as of 04-01-2023. online published installation prices: same boiler location, conventional to combi, horizontal flue

Best Price LPG Greenstar 30i

As a trend installation of LPG powered Greenstar 30i tend to be slightly more expensive than those running on natural gas. So it’s important to compare the market here also before deciding on an installer.

Best Overall Price:  BOXT £2,420

Another win for BOXT with a strong overall bundle including a Nest smart thermostat it’s good value all round.

Best Finance Price:  Heatable £2,470

A competitive headline price combined with two years interest free credit on offer.

Best PriceInstallerNext Day InstallationWarrantySystem FlushFilterPipework IncludedThermostatFinance AvailablePrice
1BOXTYes10 yearsMagnaCleanseAdey MC1+YesNest 3rd Generation10 years 10.9% APR£2,920
2HeatableNo10 yearsAdeyWorcester BoschNoWireless Controls2 years 0% APR£2,795
3Boiler PlanNo10 yearsNoNoNoHoneywell Lyric T610 years 5.9% APR£2,521
data correct as of 04-01-2023. online published installation prices: same boiler location, same system type, horizontal flue

Best Price Greenstar 30i New Location

If you wish to have your new Greenstar 30i boiler in a different location to the old one the incremental cost for the change of location can vary massively by installer. We’ve pulled apart the pricing structures of major installers so you can understand the costs and choose the right installer for the right job – depending where you want your new boiler to go.

Best Price Same Room New Location:  BOXT £2,570

Best Price New Room:  BOXT £2,720

Best Price Loft or Attic:  Heatable £2,920

Price to be wary of:  E.on charge £3,371 for a move to a loft or attic, a whopping £1,076 more than a same location swap!

Best PriceInstallerSame LocationSame Room New LocationSame Room New Location IncrementNew RoomNew Room IncrementLoft or AtticLoft or Attic Increment
1BOXT£2,420£2,570£150£2,720£300£2,920£500
2Heatable£2,470£2,710£240£2,870£400£2,970£500
3E.on£2,295£3,026£731£3,201£906£3,371£1,076
data correct as of 04-01-2023. online published installation prices: same boiler location, same system type, horizontal flue

Best Price Greenstar 30i replacing a Back Boiler

When your back boiler reaches the end of it’s useful life most people replace it with a modern combi boiler. As this job is more complicated than a replacement combi boiler in the same location it usually costs more because there is also a hot water tank to remove and the new boiler will need to go into a new location. 

Overall Best Price: BOXT £3,320

Fractionally more expensive price than E.on with a lot more value in the bundle. Plus a super clear and transparent pricing structure to move the boiler to other rooms

  • £0 additional cost to install into an airing cupboard
  • £300 additional cost to move the boiler into a new room
  • £500 additional cost to move the boiler into a loft or attic

Best PriceInstallerCost to install in airing cupboardInstall into a new roomIncremental cost of moving to a new roomCost to install in loft or atticIncremental cost of moving to loft or attic
1BOXT£3,320£3,620£300£3,820£500
2E.on£3,259N/AN/AN/AN/A
3Heatable£3,490N/AN/AN/AN/A
data correct as of 04-01-2023. online published installation prices: new boiler location, swap back boiler to combi greenstar 30i, horizontal flue

Greenstar 30i Boiler Only Price

RetailerBoiler Only Price
Plumbnation£1,148.76
Direct Heating Supplies£1,148.78
City Plumbing Supplies£1,192.00
Screwfix.com£1,460.79
data correct as of 04-01-2023.

For more information on the Worcester Bosch Greenstar 30i manual and technical data see our guide.

FAQs Greenstar 30i

How much does a Worcester Bosch Greenstar 30i boiler cost with installation?

typically between £1,750 and £3,500 depending on the job type, what sort of boiler it is replacing, boiler location, fuel type (gas, LPG, Oil) and any other extras added to the job (smart thermostats, gas pipe replacement etc)

Are Worcester Bosch Greenstar 30i boilers a Which? Best Buy?

Yes, they have been recommended by Which? for a staggering 11 years as a Best Buy.

How many Worcester Bosch Greenstar 30i boilers have been installed in the UK?

Over one Million have been installed in UK homes, reliably keeping houses warm and producing hot water on demand

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