Worcester Bosch Greenstar 25i (Combi, Gas)

Worcester Bosch's most popular boiler

Your fixed price with installation




Per month 9.9% APR

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  • Gas Safe installation
  • Worcester Bosch 10 year guarantee
  • FREE Honeywell Smart Thermostat RRP £199
  • FREE Worcester Bosch magnetic filter RRP £130
  • Manufacturer recommended Fernox chemical flush
  • New condensate installation (if required)
  • New gas pipe upgrade (if required)
  • Other controls & radiator replacement (upon request)

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Worcester Bosch, Combi, Natural Gas, Greenstar 25i




  • Height 710mm
  • Depth 330mm
  • Width 400mm

Hot water flow rate

  • 10.2 @ 35°c ∆T

Central heating output (kW)

  • 24

Hot water output (kW)

  • 25


10 Year Warranty

Worcester Bosch, Combi, Natural Gas, Greenstar 25i highlights

  • Which? Best Buy 2017 – voted for by customers and trade
  • 10 year guarantee
  • Gas Safe installation
  • Rated A for efficiency
  • Fitting pack

Free with your BOXT

Honeywell Wireless Smart Thermostat RRP £199.99

Get the latest in central heating technology free with all wall-mounted combi boilers from BOXT - it's available as an optional upgrade for other boiler types. Control your central heating from your phone. Adjust room temperatures, set timers or switch the heating on or off, whether you’re in the house or not. It’s easy to do it all from the intuitive touchscreen on the thermostat, too.

Smart thermostat
Free filter

We protect your boiler for free too

We put a FREE filter in every BOXT, worth up to £130 RRP. It filters nasties from the system water to protect the boiler and keeps it in top condition for longer.

Award winning know-how

Worcester Bosch boilers are award winning – they've claimed a Which? Best Buy rosette 7 years running. And with a warrant to supply boilers for the Queen's Sandringham Estate, they keep the royals warm and cosy through Christmas.