Boilers

Greenstar i Professional

Our Greenstar i combi boiler is the replacement for the well-established award-winning Greenstar i Junior, which has been installed in over 1 million homes across the UK.

Perfect for small to medium sized homes with one bathroom, the boilers’ new features have been designed based on installer feedback. These boilers now include increased outputs, higher hot water flow rates of up to 12.3 litres/min, a user friendly control panel and a larger condensate siphon that eliminates the risk of condensate freezing*.

Earn 10 points with these products on the Greenstar Reward Programme.

Features & Benefits

  • Wall mounting jig providing pre-plumbing and rear piping as standard
  • Low lift weight
  • Single panel front for ease of removal
  • Central heating flow and hot water temperatures can be adjusted using simple up/down buttons

Technical Details

Greenstar 25i Greenstar 30i
Part Number Greenstar 25i: 7 733 600 012 Greenstar 30i: 7 733 600 005
ErP Efficiency Rating: Water Greenstar 25i: A Greenstar 30i: A
ErP Efficiency Rating: Heating Greenstar 25i: A Greenstar 30i: A
Solar Compatible Greenstar 25i: No Greenstar 30i: No
Wave Compatible Greenstar 25i: No Greenstar 30i: No
EasyControl Compatible Greenstar 25i: Yes Greenstar 30i: Yes
Control Options Greenstar 25i: Yes Greenstar 30i: Yes
Dimensions (mm) height x width x depth Greenstar 25i: 710 x 400 x 330 Greenstar 30i: 710 x 400 x 330
Clearances (mm) above, sides, below and front Greenstar 25i: 30, 5, 200, 600 Greenstar 30i: 30, 5, 200, 600
Maximum horizontal flue (mm) Greenstar 25i: 4600 Greenstar 30i: 4600
Maximum vertical flue (mm) Greenstar 25i: 6400 Greenstar 30i: 6400
Ingress protection rating Greenstar 25i: X4D Greenstar 30i: X4D
Wall mounting jig supplied Greenstar 25i: Yes Greenstar 30i: Yes
Central heating output (kW) Greenstar 25i: 24 Greenstar 30i: 24
Max DHW output (kW) Greenstar 25i: 25 Greenstar 30i: 30
Hot water flow rate 40°c ∆T (litres per minute) Greenstar 25i: 9 Greenstar 30i: 10.8
Minimum inlet pressure (bar) Greenstar 25i: 1.3 Greenstar 30i: 2
NOx emissions (mg/kWh) Greenstar 25i: 49 (39 with a code plug) Greenstar 30i: 49 (39 with a code plug)
Lift weight (kg) Greenstar 25i: 31.7 Greenstar 30i: 31.7
Effective volume of magnetic length Greenstar 25i: n/a Greenstar 30i: n/a
Canister size (with valves in closed position) Greenstar 25i: n/a Greenstar 30i: n/a
  • 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 metres in length
  • The EasyControl adaptor is required for the Bosch EasyControl to work with our Greenstar oil boilers and our range of regular boilers