Website: aquaheat.org.uk0208772 899907956820183info@aquaheat.org.ukFaceBook Page-facebook.com/pages/aquaheatorguk/287190551322707Worcester Worcester Bosch Greenstar Highflow 440CDi & 550CDi Installation and Servicing Instructions October 27, 2017 Boiler Manuals Greenstar Highflow 440CDi & 550CDi Installation and Servicing Instructions INSTALLATION COMMISSIONING & SERVICING NATURAL GAS: GREENSTAR HIGHFLOW 440CDi GC NUMBER 47-406-24 GREENSTAR HIGHFLOW 550CDi GC NUMBER 47-406-25 fileslib. The Worcester Bosch Greenstar CDi Highflow 550 is a condensing gas boiler - we strongly recommend that you choose one of the latest condensing models if possible. With a condensing boiler, you save money on your gas bills because your boiler captures and recycles the heat present in the flue exhaust gases and water vapour condensation for re-use, meaning they operate far more economically and efficiently. The Worcester Bosch Greenstar Highflow 550CDi Details. Worcester Bosch 550 CDi Price as an estimate: £2,800 plus £500-£1,000 for installation. Band Rating: A; Efficiency Rating: 92%; ERP Rating: A heat; B water; LPG Compatible: Yes; Mounting: Floor standing; kW Options: 30.6 kW; Flow Rate: 25 litres per minute; Worcester Warranty: 5 years standard which can be extended; Don't be put off by the new boiler cost!