Saunier Duval Boilers Boiler Efficiency RatingModelTypeFuelEfficiency Saunier Duval 500 30bNon-CondensingGas65.0%Saunier Duval 500 30cNon-CondensingGas65.0%Saunier Duval 500 30fNon-CondensingGas68.0%Saunier Duval 500 40bNon-CondensingGas65.0%Saunier Duval 500 40cNon-CondensingGas65.0%Saunier Duval 500 40fNon-CondensingGas68.0%Saunier Duval 500 50bNon-CondensingGas65.0%Saunier Duval 500 50cNon-CondensingGas65.0%Saunier Duval 500 50fNon-CondensingGas68.0%Saunier Duval 500 60bNon-CondensingGas65.0%Saunier Duval 500 60cNon-CondensingGas65.0%Saunier Duval 500 60fNon-CondensingGas68.0%Saunier Duval 500 80bNon-CondensingGas65.0%Saunier Duval 50ff/LPNon-CondensingLPG80.1%Saunier Duval Ecosy 24ECondensingGas89.4%Saunier Duval Ecosy 28ECondensingGas89.2%Saunier Duval Ecosy SB24ECondensingGas89.5%Saunier Duval Ecosy SB28ECondensingGas89.3%Saunier Duval EnviroPlus F28ECondensingGas89.5%Saunier Duval EnviroPlus F28E SBCondensingGas89.6%Saunier Duval Envirotek F28ECondensingGas89.5%Saunier Duval Envirotek F28E SBCondensingGas89.6%Saunier Duval Isofast Condens F35eCondensingGas88.8%Saunier Duval Isofast F28ENon-CondensingGas79.4%Saunier Duval Isofast F35ENon-CondensingGas78.6%Saunier Duval Isomax F28E ANon-CondensingGas78.9%Saunier Duval Saunier Duval F30ENon-CondensingGas79.6%Saunier Duval Sd 235CNon-CondensingGas65.0%Saunier Duval Sd 623Non-CondensingGas70.0%Saunier Duval SD Isotwin Condens F35 ECondensingLPG90.2%Saunier Duval SD Thema Condens F 18 E SBCondensingLPG89.8%Saunier Duval SD Thema Condens F 24 ECondensingLPG89.7%Saunier Duval SD Thema Condens F 30 ECondensingLPG89.8%Saunier Duval SD Themaplus Condens F 30 ECondensingLPG89.8%Saunier Duval Semia Condens F24ECondensingGas86.1%Saunier Duval Semia Condens F30ECondensingGas86.1%Saunier Duval System 400 30Non-CondensingGas68.0%Saunier Duval System 400 40Non-CondensingGas68.0%Saunier Duval System 400 55Non-CondensingGas68.0%Saunier Duval System 400 65Non-CondensingGas68.0%Saunier Duval System 400 80Non-CondensingGas68.0%Saunier Duval Thelia 23Non-CondensingGas70.0%Saunier Duval Thelia 23ENon-CondensingGas70.0%Saunier Duval Thelia 30Non-CondensingGas70.0%Saunier Duval Thelia SB23Non-CondensingGas70.0%Saunier Duval Thelia Twin 28eNon-CondensingGas70.0%Saunier Duval Thema Classic F24ENon-CondensingGas78.3%Saunier Duval Thema Classic F24E PlusNon-CondensingGas78.3%Saunier Duval Thema Classic F30E PlusNon-CondensingGas79.6%Saunier Duval Thema Classic F30E SBNon-CondensingGas79.7%Saunier Duval Thema Classic F35ENon-CondensingGas78.6%Saunier Duval Themis 23Non-CondensingGas65.0%Saunier Duval Xeon 18 HECondensingGas88.6%Saunier Duval Xeon 30 HECondensingGas88.7%Saunier Duval Xeon 30ffNon-CondensingGas79.7%Saunier Duval Xeon 30ff/LPNon-CondensingLPG78.0%Saunier Duval Xeon 30HE LPGCondensingLPG90.7%Saunier Duval Xeon 40ffNon-CondensingGas78.7%Saunier Duval Xeon 40ff/LPNon-CondensingLPG78.0%Saunier Duval Xeon 50ffNon-CondensingGas78.8%Saunier Duval Xeon 60ffNon-CondensingGas79.4%Saunier Duval Xeon 60ff/LPNon-CondensingLPG77.5%Saunier Duval Xeon 80 ffNon-CondensingGas79.4%Saunier Duval Xeon 80ffNon-CondensingGas76.3%Saunier Duval Xeon 80ff/LPNon-CondensingLPG79.8%Saunier Duval Xeon Condens 18CondensingGas88.6%Saunier Duval Xeon Condens 30CondensingGas88.8%Saunier Duval Xeon Condens 30 LPGCondensingLPG90.7%Saunier Duval Xeon40ffNon-CondensingGas75.4%Get FREE Boiler QuotesCompare prices todayNo obligation to buyVisit Boiler Guide to get free quotes from trustworthy heating engineers in your area. Enter postcode Get Quotes