Bradford White® BUILTBEST™ Warranty Upgrade Kit, For Use With: RG250H6/RG275H6/RG2F40S6/RG2F50S6/RG2100H6/RG2D40S6/RG2D50S6/RG2DV40S6/RG2DV50S6/RG2DV50H6/RG2MH40T6/RG2MH30T6/RG2DVMH30T6/RG2DVMH40T6/RG2PDV50H6/RG2PDV75H6/RG2PDV40S6/RG2PDV50S6/RG1PV40S6/RG1PV50S6/RG2PV40S6/RG2PV50S6/RG2PV40T6/RG2PV50T6/RG2PV50H6/RG2PV75H6/RC2PV50H6/RC2PDV50H6/URG250H6/URG275H6/URG2100H6/URG2D40S6/URG2D50S6/URG2DV40S6/URG2DV50S6/URG2DV50H6/URG1PV40S6/URG1PV50S6/URG2PV40T6/URG2PV50T6/URG2PV50H6/URG2PV75H6/URG2PDV40S6/URG2PDV50S6/URG2PDV50H6 Residential Gas Water Heaters and RE2H50S6/RE2H65T6/RE2H80T6/MS65R6/MS120R6/MS80R6 Residential Electric Water Heaters, Specifications: 4 Years Extended Limited Warranty Plan, Domestic