Worcester Bosch Greenstar i System

The Worcester Bosch Greenstar i System is the most popular wall-mounted system boiler with 9, 12 ,15, 18, 21 and 24 kilowatt versions.

Suitable for a wide range of homes, this boiler comes with a steel wall-mounting jig that not only allows pipes to go behind the boiler but also the ability to pre-pipe all of the pipework before the boiler is placed on the wall.

The appliance can be used with the range of high efficiency Worcester Bosch Greenstore cylinders.

Features & Benefits

  • Wall mounting jig providing pre-plumbing and rear piping as standard
  • Central heating flow temperatures can be adjusted using simple up/down button
  • Large siphon inside - eliminates risk of condensate pipe freezing
  • Homeowner service reminder
  • Low lift weight
  • Plug & play optional Worcester controls available
  • Achieves an A+ ErP efficiency rating for heating when installed with a Wave smart internet connected control (Excludes 9kW variant)
  • Scan and register the boiler using our FREE online registration app
  • Single panel front for ease of removal
  • Fan can be removed with just one screw and the expansion tank is now inside the boiler
  • Commissioning information for easier completion of the Benchmark checklist

Technical Details

Greenstar i
ErP Efficiency Rating: Water Greenstar i: n/a
ErP Efficiency Rating: Heating Greenstar i: A
Solar Compatible Greenstar i: Yes
Wave Compatible Greenstar i: No
EasyControl Compatible Greenstar i: Yes
Control Options Greenstar i: Yes
Dimensions (mm) height x width x depth Greenstar i: 710 x 400 x 330
Clearances (mm) above, sides, below and front Greenstar i: 30, 5, 200, 600
Maximum horizontal flue (mm) Greenstar i: 4600
Maximum vertical flue (mm) Greenstar i: n/a
Ingress protection rating Greenstar i: IP20
Wall mounting jig supplied Greenstar i: Yes
Central heating output (kW) Greenstar i: 9 / 12 / 15 / 18 / 21 / 24
Max DHW output (kW) Greenstar i: n/a
Hot water flow rate 40°c ∆T (litres per minute) Greenstar i: n/a
Minimum inlet pressure (bar) Greenstar i: n/a
NOx emissions (mg/kWh) Greenstar i: 36 / 45 / 42 / 50 / 49 / 49
Lift weight (kg) Greenstar i: 30.9
Effective volume of magnetic length Greenstar i: n/a
Canister size (with valves in closed position) Greenstar i: n/a
  • Plug & play optional Worcester controls available with installation of optional built-in diverter valve.
  • The Condensesure Siphon has been proven to be effective at preventing frozen condensate at -15°C for a sustained period of 48 hours. 32mm pipework must be used and should not exceed 3 metre.
  • The EasyControl adaptor is required for the Bosch EasyControl to work with our Greenstar oil boilers and our range of regular boilers.