Worcester Bosch Greenstar 42CDi Classic (Combi, Gas)

Our most powerful wall-mounted boiler

Your fixed price with installation




Per month APR

  • Gas Safe installation
  • FREE Honeywell Smart Thermostat RRP £199.99
  • FREE Worcester Bosch magnetic filter worth £154.99
  • FREE system cleanse
  • 10 year warranty
  • Flue - an essential piece of kit worth up to £100
  • Fitting pack
  • All the right safety attachments

Make sure this is the right boiler for you...


Worcester Bosch, Combi, Natural Gas, Greenstar 42CDi Classic




  • Height 760mm
  • Depth 360mm
  • Width 440mm

Hot water flow rate

  • 17.4 @ 35°c ∆T

Central heating output (kW)

  • 30

Hot water output (kW)

  • 42


10 Year Warranty

Worcester Bosch, Combi, Natural Gas, Greenstar 42CDi Classic highlights

  • Top-of-the-range performance
  • Enough power for a big family home
  • FREE Honeywell Smart Thermostat RRP £199.99
  • FREE filter worth up to £130
  • FREE system cleanse
  • Gas Safe Installation

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.