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Worcester Boilers Boiler Efficiency Rating

Worcester Bosch is one of the most well known boiler manufacturers in UK and have become a popular choice with homeowners looking for gas, oil or LPG boilers since their beginnings in 1962.

Their condensing boiler technology has seen Worcester Bosch lead the way when it comes to highly efficient boilers. With an extensive range of Combi, Regular and System boilers, their Greenstar models will help to lower the carbon footprint of your home as well your energy bills. These boilers have won several awards thanks to emitting low levels of CO2 and NOx, making them kinder on the environment than many other boilers on the market.

ModelTypeFuelEfficiency
Worcester 14/19 CBi RSFNon-CondensingGas79.4%
Worcester 15 CBi RSFNon-CondensingGas76.6%
Worcester 15 Sbi RSFNon-CondensingGas79.1%
Worcester 19/24 CBi RSFNon-CondensingGas78.4%
Worcester 24 CBi RSFNon-CondensingGas76.9%
Worcester 24 CDi – L OFNon-CondensingLPG79.6%
Worcester 24 Cdi BFNon-CondensingGas79.4%
Worcester 24 Cdi OFNon-CondensingGas76.2%
Worcester 24 Cdi RSFNon-CondensingGas76.0%
Worcester 24 CDi RSF-LNon-CondensingLPG80.5%
Worcester 24 I RSFNon-CondensingGas76.1%
Worcester 24 LE RSFNon-CondensingGas76.0%
Worcester 24 Sbi RSFNon-CondensingGas78.3%
Worcester 24 SI II RSFNon-CondensingLPG80.5%
Worcester 240 CFNon-CondensingGas65.0%
Worcester 240bfNon-CondensingGas65.0%
Worcester 240ofNon-CondensingGas65.0%
Worcester 240rsfNon-CondensingGas70.0%
Worcester 24CDi RSF Serial ASBNon-CondensingGas78.1%
Worcester 24CDi RSF Serial ASCNon-CondensingLPG80.5%
Worcester 24i – L RSFNon-CondensingGas78.3%
Worcester 24i JuniorNon-CondensingGas78.0%
Worcester 25 Si – L RSFNon-CondensingGas78.0%
Worcester 25 Si RSFNon-CondensingLPG81.1%
Worcester 25Si – LL RSFNon-CondensingLPG81.1%
Worcester 26 Cdi XtraCondensingGas85.4%
Worcester 26 CDi Xtra RSFCondensingLPG86.5%
Worcester 26 CDi Xtra RSF – LCondensingGas86.4%
Worcester 28 CDi – L RSFNon-CondensingLPG80.7%
Worcester 28 Cdi RSFNon-CondensingGas78.9%
Worcester 28 LE RSFNon-CondensingGas78.9%
Worcester 28 SI II RSFNon-CondensingGas78.4%
Worcester 28 Si RSFNon-CondensingLPG81.4%
Worcester 280rsfNon-CondensingGas70.0%
Worcester 28i JuniorNon-CondensingGas78.9%
Worcester 28i RSFNon-CondensingGas78.0%
Worcester 35 CDi II RSFNon-CondensingGas78.5%
Worcester 35 Cdi RSFNon-CondensingGas78.9%
Worcester 533 Compact ErPCondensingGas89.8%
Worcester 533 Compact NGCondensingGas89.8%
Worcester 535 Compact ErPCondensingGas89.8%
Worcester 535 Compact NGCondensingGas89.8%
Worcester 80 ic RSFNon-CondensingGas75.2%
Worcester 9.24electronicrsfNon-CondensingGas70.0%
Worcester 9.24electronicrsfeNon-CondensingGas70.0%
Worcester 9/14 CBi RSFNon-CondensingGas78.5%
Worcester Bosch 50/70.000Non-CondensingOil85.3%
Worcester Bosch 70/90-000-NI-LNon-CondensingOil84.2%
Worcester Bosch 70/90.000Non-CondensingOil83.9%
Worcester Bosch 90/110.000Non-CondensingOil85.1%
Worcester Bosch Greenstar ZWBR 7-25ACondensingGas89.4%
Worcester Bosch RX-2 RSFCondensingGas85.4%
Worcester Bosch/British Gas CC1 ZWB 7-29ACondensingGas88.7%
Worcester Bosch/British Gas CS1 ZB 7-28ACondensingGas88.8%
Worcester Bosch/British Gas ICC2 ZWBR 11-37ACondensingGas89.5%
Worcester Bosch/British Gas ICC2 ZWBR 8-30ACondensingGas89.5%
Worcester Bosch/British Gas ICS1 ZBR 8-35ACondensingGas89.6%
Worcester Bosch/British Gas ICS1 ZSBR 7-28ACondensingGas88.8%
Worcester Bosch/British Gas RD529 ZWB 7-29 ACondensingGas88.7%
Worcester Danesmoor 12/14-000-GB-LNon-CondensingOil84.4%
Worcester Danesmoor 12/14-R00-GB-LNon-CondensingOil84.4%
Worcester Danesmoor 12/14.OOONon-CondensingOil84.3%
Worcester Danesmoor 12/14.ROONon-CondensingOil84.3%
Worcester Danesmoor 15/19.OOONon-CondensingOil85.3%
Worcester Danesmoor 15/19.ROONon-CondensingOil85.3%
Worcester Danesmoor 20/25 – R00-GB-LNon-CondensingOil84.2%
Worcester Danesmoor 20/25-000-GB-LNon-CondensingOil84.2%
Worcester Danesmoor 20/25.OOONon-CondensingOil83.9%
Worcester Danesmoor 20/25.ROONon-CondensingOil83.9%
Worcester Danesmoor 26/32.OOONon-CondensingOil85.1%
Worcester Danesmoor 26/32.ROONon-CondensingOil85.1%
Worcester Danesmoor 32/50 – 000 -GB – LNon-CondensingOil84.3%
Worcester Danesmoor 32/50.000Non-CondensingOil83.1%
Worcester Danesmoor 50/70 – 000 – GB – LNon-CondensingOil84.1%
Worcester Danesmoor 50/70.000Non-CondensingOil84.6%
Worcester Danesmoor FS 12-18Non-CondensingOil84.7%
Worcester Danesmoor FS 18-25Non-CondensingOil85.6%
Worcester Danesmoor System 12/14-0S0-GB-L SystemNon-CondensingOil84.4%
Worcester Danesmoor System 12/14-RS0-GB-L SystemNon-CondensingOil84.4%
Worcester Danesmoor System 12/14.OSONon-CondensingOil84.3%
Worcester Danesmoor System 12/14.RSONon-CondensingOil84.3%
Worcester Danesmoor System 15.19.OSONon-CondensingOil85.3%
Worcester Danesmoor System 15/19.RSONon-CondensingOil85.3%
Worcester Danesmoor System 20/25-0S0-GB-L SystemNon-CondensingOil84.2%
Worcester Danesmoor System 20/25-RS0-GB-L SystemNon-CondensingOil84.2%
Worcester Danesmoor System 20/25.OSONon-CondensingOil83.9%
Worcester Danesmoor System 20/25.RSONon-CondensingOil83.9%
Worcester Danesmoor Utility 12/14-000-GB-L UtilityNon-CondensingOil84.4%
Worcester Danesmoor Utility 12/14-R00-GB-L UtilityNon-CondensingOil84.4%
Worcester Danesmoor Utility 12/14.OOONon-CondensingOil84.3%
Worcester Danesmoor Utility 12/14.ROONon-CondensingOil84.3%
Worcester Danesmoor Utility 15/19.OOONon-CondensingOil85.3%
Worcester Danesmoor Utility 15/19.ROONon-CondensingOil85.3%
Worcester Danesmoor Utility 20/25-000-GB-L UtilityNon-CondensingOil84.2%
Worcester Danesmoor Utility 20/25-R00-GB-L UtilityNon-CondensingOil84.2%
Worcester Danesmoor Utility 20/25.OOONon-CondensingOil83.9%
Worcester Danesmoor Utility 20/25.ROONon-CondensingOil83.9%
Worcester Danesmoor Utility 32/50 – 000 – GB – Utility – LNon-CondensingOil84.3%
Worcester Danesmoor Utility 50/70 – 000 – GB – Utility – LNon-CondensingOil84.1%
Worcester Danesmoor Wall Mounted 12/19 – R00 – GB – LNon-CondensingOil84.4%
Worcester Danesmoor WM 12/19 RSNon-CondensingOil84.1%
Worcester Delglo 2bfNon-CondensingGas65.0%
Worcester Delglo 2ofNon-CondensingGas65.0%
Worcester Delglo 3bfNon-CondensingGas65.0%
Worcester Delglo 3ofNon-CondensingGas65.0%
Worcester Firefly HD II 100Non-CondensingOil65.0%
Worcester Firefly HD II 40Non-CondensingOil65.0%
Worcester Firefly HD II 40 D typeNon-CondensingOil65.0%
Worcester Firefly HD II 50Non-CondensingOil65.0%
Worcester Firefly HD II 50 D typeNon-CondensingOil65.0%
Worcester Firefly HD II 60 D typeNon-CondensingOil65.0%
Worcester Firefly HD II 70Non-CondensingOil65.0%
Worcester Firefly HD II 80Non-CondensingOil65.0%
Worcester Firefly PJ90-120Non-CondensingOil65.0%
Worcester GB 162-50 kWCondensingGas88.7%
Worcester GB162-50 V2CondensingGas88.7%
Worcester GB162-65 V2CondensingGas88.6%
Worcester GB162-65kWCondensingGas88.9%
Worcester Greenstar 12 RiCondensingGas88.8%
Worcester Greenstar 12i SystemCondensingGas88.8%
Worcester Greenstar 12i System ErPCondensingGas89.8%
Worcester Greenstar 12i System ErP LPGCondensingLPG89.8%
Worcester Greenstar 12Ri ErPCondensingGas88.8%
Worcester Greenstar 12Ri ErP LPGCondensingLPG89.0%
Worcester Greenstar 15 i SystemCondensingLPG89.8%
Worcester Greenstar 15i System ErPCondensingGas89.7%
Worcester Greenstar 15i System ErP LPGCondensingLPG89.1%
Worcester Greenstar 15RiCondensingLPG89.8%
Worcester Greenstar 15Ri ErPCondensingGas88.8%
Worcester Greenstar 15Ri ErP LPGCondensingLPG89.1%
Worcester Greenstar 18 i SystemCondensingLPG89.8%
Worcester Greenstar 18i System ErPCondensingGas89.7%
Worcester Greenstar 18i System ErP LPGCondensingLPG89.1%
Worcester Greenstar 18RiCondensingLPG89.8%
Worcester Greenstar 18Ri ErPCondensingGas88.8%
Worcester Greenstar 18Ri ErP LPGCondensingLPG89.2%
Worcester Greenstar 21i System ErPCondensingGas89.7%
Worcester Greenstar 21i System ErP LPGCondensingLPG89.1%
Worcester Greenstar 24CondensingGas88.6%
Worcester Greenstar 24 RiCondensingGas89.2%
Worcester Greenstar 24i juniorCondensingLPG90.1%
Worcester Greenstar 24i SystemCondensingGas89.2%
Worcester Greenstar 24i System ErPCondensingGas89.7%
Worcester Greenstar 24i System ErP LPGCondensingLPG89.1%
Worcester Greenstar 24Ri ErPCondensingGas89.2%
Worcester Greenstar 24Ri ErP LPGCondensingLPG88.9%
Worcester Greenstar 25 SiCondensingLPG90.1%
Worcester Greenstar 25 Si CompactCondensingGas89.8%
Worcester Greenstar 25i ErPCondensingGas89.6%
Worcester Greenstar 25i ErP LPGCondensingLPG89.1%
Worcester Greenstar 25Si Compact ErPCondensingGas89.8%
Worcester Greenstar 25Si Compact ErP LPGCondensingLPG90.4%
Worcester Greenstar 27 I System CompactCondensingGas89.0%
Worcester Greenstar 27 Ri CompactCondensingGas89.0%
Worcester Greenstar 27i System Compact ErPCondensingGas89.0%
Worcester Greenstar 27i System Compact ErP LPGCondensingLPG89.9%
Worcester Greenstar 27Ri Compact ErPCondensingGas89.0%
Worcester Greenstar 27Ri Compact ErP LPGCondensingLPG89.9%
Worcester Greenstar 28CondensingGas88.6%
Worcester Greenstar 28 CDi CompactCondensingLPG90.9%
Worcester Greenstar 28CDi Compact ErPCondensingGas89.8%
Worcester Greenstar 28CDi Compact ErP LPGCondensingLPG90.4%
Worcester Greenstar 28i juniorCondensingLPG90.1%
Worcester Greenstar 29CDi ClassicCondensingGas89.1%
Worcester Greenstar 29CDi Classic ErPCondensingGas89.1%
Worcester Greenstar 29CDi Classic ErP LPGCondensingLPG90.1%
Worcester Greenstar 29CDi CombiCondensingLPG90.1%
Worcester Greenstar 29HE Conventional ZB 7-29CondensingGas88.7%
Worcester Greenstar 30CondensingGas88.6%
Worcester Greenstar 30 CDi Classic RegularCondensingLPG90.2%
Worcester Greenstar 30 CDi Classic SystemCondensingLPG90.2%
Worcester Greenstar 30 I System CompactCondensingGas89.0%
Worcester Greenstar 30 LXi SystemCondensingGas89.0%
Worcester Greenstar 30 Ri CompactCondensingGas89.0%
Worcester Greenstar 30 SiCondensingLPG90.1%
Worcester Greenstar 30 Si CompactCondensingGas89.8%
Worcester Greenstar 30CDi Classic Regular ErPCondensingGas89.2%
Worcester Greenstar 30CDi Classic Regular ErP LPGCondensingLPG90.2%
Worcester Greenstar 30CDi Classic System ErPCondensingGas89.2%
Worcester Greenstar 30CDi Classic System ErP LPGCondensingLPG90.2%
Worcester Greenstar 30i ErPCondensingGas89.6%
Worcester Greenstar 30i ErP LPGCondensingLPG89.1%
Worcester Greenstar 30i System Compact ErPCondensingGas89.0%
Worcester Greenstar 30i System Compact ErP LPGCondensingLPG89.9%
Worcester Greenstar 30Ri Compact ErPCondensingGas89.0%
Worcester Greenstar 30Ri Compact ErP LPGCondensingLPG89.9%
Worcester Greenstar 30Si Compact ErPCondensingGas89.8%
Worcester Greenstar 30Si Compact ErP LPGCondensingLPG90.4%
Worcester Greenstar 32 CDi CompactCondensingGas89.8%
Worcester Greenstar 32CDi Compact ErPCondensingGas89.8%
Worcester Greenstar 32CDi Compact ErP LPGCondensingLPG90.4%
Worcester Greenstar 34 CDi CombiCondensingLPG90.1%
Worcester Greenstar 34CDi ClassicCondensingGas89.1%
Worcester Greenstar 34CDi Classic ErPCondensingGas89.1%
Worcester Greenstar 34CDi Classic ErP LPGCondensingLPG90.1%
Worcester Greenstar 34CDi CombiCondensingGas89.1%
Worcester Greenstar 35 CDi Classic SystemCondensingLPG90.2%
Worcester Greenstar 35CDi Classic System ErPCondensingGas89.2%
Worcester Greenstar 35CDi Classic System ErP LPGCondensingLPG90.2%
Worcester Greenstar 36 CDi CompactCondensingLPG90.9%
Worcester Greenstar 36CDi Compact ErPCondensingGas89.8%
Worcester Greenstar 36CDi Compact ErP LPGCondensingLPG90.4%
Worcester Greenstar 36LXiCondensingGas89.8%
Worcester Greenstar 37 CDiCondensingLPG90.4%
Worcester Greenstar 38CDi ClassicCondensingGas89.0%
Worcester Greenstar 38CDi Classic ErPCondensingGas89.0%
Worcester Greenstar 38CDi Classic ErP LPGCondensingLPG90.0%
Worcester Greenstar 38CDi CombiCondensingLPG90.0%
Worcester Greenstar 40 CDi Classic RegularCondensingLPG90.2%
Worcester Greenstar 40CDi Classic Regular ErPCondensingGas89.2%
Worcester Greenstar 40CDi Classic Regular ErP LPGCondensingLPG90.2%
Worcester Greenstar 42 CDiCondensingLPG90.4%
Worcester Greenstar 42CDi ClassicCondensingGas89.4%
Worcester Greenstar 42CDi Classic ErPCondensingGas89.0%
Worcester Greenstar 42CDi Classic ErP LPGCondensingLPG90.0%
Worcester Greenstar 9i System ErPCondensingGas89.8%
Worcester Greenstar 9i System ErP LPGCondensingLPG89.8%
Worcester Greenstar Camray 12/18CondensingOil90.9%
Worcester Greenstar Camray 18/25CondensingOil91.2%
Worcester Greenstar Camray 25/32CondensingOil91.7%
Worcester Greenstar Camray External 12/18CondensingOil90.9%
Worcester Greenstar Camray External 18/25CondensingOil91.2%
Worcester Greenstar Camray External 25/32CondensingOil91.7%
Worcester Greenstar Camray External System 12/18CondensingOil90.9%
Worcester Greenstar Camray External System 18/25CondensingOil91.2%
Worcester Greenstar Camray External System 25/32CondensingOil91.7%
Worcester Greenstar Camray System 12/18CondensingOil90.9%
Worcester Greenstar Camray System 18/25CondensingOil91.2%
Worcester Greenstar Camray System 25/32CondensingOil91.7%
Worcester Greenstar Camray Utility 12/18CondensingOil90.9%
Worcester Greenstar Camray Utility 18/25CondensingOil91.2%
Worcester Greenstar Camray Utility 25/32CondensingOil91.7%
Worcester Greenstar Camray Utility System 12/18CondensingOil90.9%
Worcester Greenstar Camray Utility System 18/25CondensingOil91.2%
Worcester Greenstar Camray Utility System 25/32CondensingOil91.7%
Worcester Greenstar CDi 25 CdiCondensingGas90.0%
Worcester Greenstar CDi 27 CDiCondensingLPG90.4%
Worcester Greenstar CDi 30 CDiCondensingGas89.4%
Worcester Greenstar Cdi 30 Cdi ConventionalCondensingGas89.5%
Worcester Greenstar Cdi 30 Cdi SystemCondensingGas89.5%
Worcester Greenstar CDi 31 CDiCondensingGas89.4%
Worcester Greenstar CDi 35 CDiCondensingGas89.4%
Worcester Greenstar Cdi 40 CdiCondensingGas89.4%
Worcester Greenstar Cdi 40 Cdi ConventionalCondensingGas89.1%
Worcester Greenstar Danesmoor 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor 18/25-OOO-GBCondensingOil90.8%
Worcester Greenstar Danesmoor 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor External 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor External 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor External 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor External 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor External 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor External 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor System 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor System 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor System 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor System 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor System 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor System 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor System External 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor System External 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor System External 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor System External 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor System External 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor System External 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor System Utility 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor System Utility 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor System Utility 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor System Utility 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor System Utility 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor System Utility 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor Utility 12/18CondensingOil91.1%
Worcester Greenstar Danesmoor Utility 12/18 ErPCondensingOil91.1%
Worcester Greenstar Danesmoor Utility 18/25CondensingOil90.9%
Worcester Greenstar Danesmoor Utility 18/25 ErPCondensingOil90.9%
Worcester Greenstar Danesmoor Utility 25/32CondensingOil90.7%
Worcester Greenstar Danesmoor Utility 25/32 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor Utility 32/50 ErPCondensingOil90.5%
Worcester Greenstar Danesmoor Utility 50/70 ErPCondensingOil90.7%
Worcester Greenstar Danesmoor Wall Mounted 18/25CondensingOil90.7%
Worcester Greenstar Danesmoor Wall-Mounted 12/18CondensingOil90.7%
Worcester Greenstar FS 30 CDi RegularCondensingGas88.9%
Worcester Greenstar FS 30CDi Regular ErPCondensingGas88.9%
Worcester Greenstar FS 42 CDi RegularCondensingGas88.8%
Worcester Greenstar FS 42CDi Regular ErPCondensingGas88.8%
Worcester Greenstar HE 12/22 RSCondensingOil89.5%
Worcester Greenstar HE Plus ZWBR 11-35ACondensingGas89.5%
Worcester Greenstar HE Plus ZWBR 7-28ACondensingGas88.7%
Worcester Greenstar HE ZB 7-27ACondensingGas88.8%
Worcester Greenstar HE ZWB 7-27ACondensingGas88.7%
Worcester Greenstar Heatslave 12/18CondensingOil89.3%
Worcester Greenstar Heatslave 18/25-OSO-GBCondensingOil89.1%
Worcester Greenstar Heatslave 25/32CondensingOil89.1%
Worcester Greenstar Heatslave External 12/18CondensingOil89.3%
Worcester Greenstar Heatslave External 18/25CondensingOil89.1%
Worcester Greenstar Heatslave External 25/32CondensingOil89.1%
Worcester Greenstar Heatslave II 12/18CondensingOil89.4%
Worcester Greenstar Heatslave II 12/18 ErPCondensingOil89.4%
Worcester Greenstar Heatslave II 18/25CondensingOil89.2%
Worcester Greenstar Heatslave II 18/25 ErPCondensingOil89.2%
Worcester Greenstar Heatslave II 25/32CondensingOil89.0%
Worcester Greenstar Heatslave II 25/32 ErPCondensingOil89.0%
Worcester Greenstar Heatslave II External 12/18CondensingOil89.4%
Worcester Greenstar Heatslave II External 12/18 ErPCondensingOil89.4%
Worcester Greenstar Heatslave II External 18/25CondensingOil89.2%
Worcester Greenstar Heatslave II External 18/25 ErPCondensingOil89.2%
Worcester Greenstar Heatslave II External 25/32CondensingOil89.0%
Worcester Greenstar Heatslave II External 25/32 ErPCondensingOil89.0%
Worcester Greenstar Highflow 440CondensingGas89.1%
Worcester Greenstar Highflow 440 CDiCondensingGas89.2%
Worcester Greenstar Highflow 440CDi ErPCondensingGas89.2%
Worcester Greenstar Highflow 550 CDiCondensingGas89.2%
Worcester Greenstar Highflow 550CDi ErPCondensingGas89.2%
Worcester Greenstar R 25 HE CombiCondensingGas88.7%
Worcester Greenstar R 28 HE SystemCondensingGas88.8%
Worcester Greenstar R 29 HE ConventionalCondensingGas88.8%
Worcester Greenstar R 30 HE CombiCondensingGas88.7%
Worcester Greenstar R 30 HE Plus CombiCondensingLPG89.7%
Worcester Greenstar R 30HE Plus CombiCondensingGas88.7%
Worcester Greenstar R 35 HE Plus CombiCondensingGas89.5%
Worcester Greenstar R 40 HE ConventionalCondensingGas89.0%
Worcester Greenstar R 40 HE Plus CombiCondensingGas88.9%
Worcester Greenstar Utility 18/25-OOO-GBCondensingOil90.8%
Worcester Greenstar Utility 32/50-000-GBCondensingOil90.7%
Worcester Greenstar Utility 50/70-000-GBCondensingOil90.5%
Worcester Greenstar ZB 7-28 HECondensingGas88.8%
Worcester Greenstar ZWB 7-25 HE CombiCondensingGas88.7%
Worcester Greenstar ZWB 7-30 HE CombiCondensingGas88.7%
Worcester Greenstar ZWBR 11-35 HE PlusCondensingGas89.5%
Worcester Greenstar ZWBR 7-30 HE PlusCondensingGas88.7%
Worcester Heat Slave 12/14.OSONon-CondensingOil82.8%
Worcester Heat Slave 12/14.RSONon-CondensingOil82.8%
Worcester Heat Slave 15/19.OSONon-CondensingOil83.7%
Worcester Heat Slave 15/19.RSONon-CondensingOil83.7%
Worcester Heat Slave 20/25.OSONon-CondensingOil82.4%
Worcester Heat Slave 20/25.RSONon-CondensingOil83.7%
Worcester Heatslave 12/14-OSO-GB-L Oil CombiNon-CondensingOil82.7%
Worcester Heatslave 12/14-RSO-GB-L Oil CombiNon-CondensingOil82.7%
Worcester Heatslave 12/14RSNon-CondensingOil70.0%
Worcester Heatslave 2 g40bfNon-CondensingGas65.0%
Worcester Heatslave 2 g40ofNon-CondensingGas65.0%
Worcester Heatslave 2 g50bfNon-CondensingGas65.0%
Worcester Heatslave 2 g50ofNon-CondensingGas65.0%
Worcester Heatslave 20/25-OSO-GB-L Oil CombiNon-CondensingOil82.5%
Worcester Heatslave 20/25-RSO-GB-L Oil CombiNon-CondensingOil82.5%
Worcester Heatslave 20/25RSNon-CondensingOil70.0%
Worcester Heatslave 26/32-OSO-GB Oil CombiNon-CondensingOil83.4%
Worcester Heatslave 26/32-RSO-GB Oil CombiNon-CondensingOil83.4%
Worcester Heatslave 9.24bfNon-CondensingGas65.0%
Worcester Heatslave 9.24ofNon-CondensingGas65.0%
Worcester Heatslave 9.24rsfNon-CondensingGas70.0%
Worcester Heatslave highflow3.5rsfNon-CondensingGas72.0%
Worcester Heatslave highflow4.5bfNon-CondensingGas65.0%
Worcester Heatslave highflow4.5ofNon-CondensingGas65.0%
Worcester Heatslave highflowbfNon-CondensingGas65.0%
Worcester Heatslave highflowofNon-CondensingGas65.0%
Worcester Heatslave juniorbfNon-CondensingGas65.0%
Worcester Heatslave juniorofNon-CondensingGas65.0%
Worcester Heatslave senior12bfNon-CondensingGas65.0%
Worcester Heatslave senior12ofNon-CondensingGas65.0%
Worcester Heatslave senior15bfNon-CondensingGas65.0%
Worcester Heatslave senior15ofNon-CondensingGas65.0%
Worcester Heatslave senior6bfNon-CondensingGas65.0%
Worcester Heatslave senior6ofNon-CondensingGas65.0%
Worcester High Flow 400 BFNon-CondensingGas75.9%
Worcester Highflow 400 Electronic BF BFNon-CondensingGas80.0%
Worcester Highflow 400 Electronic OF OFNon-CondensingGas78.5%
Worcester Highflow 400 Electronic RSF RSFNon-CondensingLPG80.3%
Worcester Highflow 400 OFNon-CondensingGas75.2%
Worcester Highflow 400 RSFNon-CondensingGas79.2%