Worcester Bosch Greenstar 4000 21kW System Boiler LPG 7733600384

Worcester Bosch designed this 21kW LPG condensing system boiler to meet an ErP A efficiency standard. The wall-mounted unit features a pre-piping jig with rear piping as standard to simplify replacing previous Worcester i system models. Siting flexibility is supported by 60/100mm flues that accommodate pipe runs up to 12m long. A 500ml integrated condensate siphon holds discharge volume to minimise freezing risks in frost conditions. To optimise fuel efficiency when heat demand drops, the system operates across a wide modulation range. Operating sound levels remain quiet, reaching up to 42 decibels. A long-text colour screen provides clear system diagnostic text and control menus. Supplied under product code 7733600384, the Greenstar 4000 unit allows direct component access for straightforward servicing.