A. O. Smith

Brands Owned by A. O. Smith

U.S. Craftmaster

Most Efficient Water Heater Systems by A. O. Smith

SYSTEM TYPE	TANK SIZE	EFFICIENCY (UEF)	SOLD AS (BRANDS & MODELS)
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPTS-66 2, 10-66-DHPTS 2, HPSA065KD 2, HPS10-66H45DV 2, HPS10266H045DV 2, HPSX-66-DHPT 2	View System
Heat Pump	81 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State 10-80-DHPTA 2, HPA10280H045DV 2, HPPA080KD 2, HPAX-80-DHPT 2, HPTA-80 2, HPA10-80H45DV 2	View System
Heat Pump	82 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPS10280H045DV 2, HPS10-80H45DV 2, 10-80-DHPTS 2, HPSA080KD 2, HPTS-80 2, HPSX-80-DHPT 2	View System
Heat Pump	81 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State 10-80-DHPTA 2, HPA10280H045DV 2, HPPA080KD 2, HPAX-80-DHPT 2, HPTA-80 2, HPA10-80H45DV 2	View System
Heat Pump	82 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPS10280H045DV 2, HPS10-80H45DV 2, 10-80-DHPTS 2, HPSA080KD 2, HPTS-80 2, HPSX-80-DHPT 2	View System

SYSTEM TYPE	TANK SIZE	EFFICIENCY (UEF)	SOLD AS (BRANDS & MODELS)
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi GT-540X3-NEH 1, GTS-540-NEH 1, GT15-540-NO 1, TCT-199O-N 1, ACT-199O-N 1, ATO-540HX3-N 1, LTO-540H-N 1, GTS-540P-NEH 1, TS-540-GEH 1, ATO-540P-N 1, MCT-199O-N 1, TS-540X3-GEH 1, LTO-540P-N 1, SCT-199O-N 1, TS-540P-GEH 1, GT-540-NEH 1, GTS-540X3-NEH 1, TK-540P-NEH 1, T-H3-OS-N 1, LCT-199O-N 1, ATO-540H 1, LTO-540HX3-N 1, GT-540P-NEH 1**	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi GTS-540X3-PEH 11, TS-540X3-LEH 11, TK-540P-PEH 11, ATO-540HX3-P 11, ATO-540H 11, ACT-199O-P 11, ATO-540P-P 11, TS-540-LEH 11, TCT-199O-P 11, MCT-199O-P 11, LTO-540P-P 11, GT-540P-PEH 11, T-H3-OS-P 11, TS-540P-LEH 11, GTS-540-PEH 11, LTO-540HX3-P 11, LCT-199O-P 11, LTO-540H-P 11, GTS-540P-PEH 11, GT-540-PEH 11, GT-540X3-PEH 11, SCT-199O-P 11	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State GT15THR-160X3 1, RTHR-160M 1, MTHR-160X3 1, STHR-160X3 1, JTHR-160M 1, JTHR-160X3 1, LTHR-160M 1, MTHR-160M 1, STHR-160M 1, ATHR-160M 1, LTHR-160X3 1, GTHR-160M 1, GT15THR-160M 1, RTHR-160X3 1, ATHR-160X3 1, GTHR-160X3 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State GT15THR-160X3 1, RTHR-160M 1, MTHR-160X3 1, STHR-160X3 1, JTHR-160M 1, JTHR-160X3 1, LTHR-160M 1, MTHR-160M 1, STHR-160M 1, ATHR-160M 1, LTHR-160X3 1, GTHR-160M 1, GT15THR-160M 1, RTHR-160X3 1, ATHR-160X3 1, GTHR-160X3 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State ATHR-180X3 1, RTHR-180X3 1, STHR-180M 1, RTHR-180M 1, GT15THR-180M 1, STHR-180X3 1, LTHR-180M 1, JTHR-180X3 1, LTHR-180X3 1, JTHR-180M 1, GTHR-180X3 1, MTHR-180M 1, MTHR-180X3 1, GT15THR-180X3 1, GTHR-180M 1, ATHR-180M 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State ATHR-180X3 1, RTHR-180X3 1, STHR-180M 1, RTHR-180M 1, GT15THR-180M 1, STHR-180X3 1, LTHR-180M 1, JTHR-180X3 1, LTHR-180X3 1, JTHR-180M 1, GTHR-180X3 1, MTHR-180M 1, MTHR-180X3 1, GT15THR-180X3 1, GTHR-180M 1, ATHR-180M 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State RTHR-199X3 1, STHR-199M 1, GTHR-199M 1, MTHR-199X3 1, GT15THR-199X3 1, JTHR-199X3 1, ATHR-199M 1, MTHR-199M 1, GTHR-199X3 1, RTHR-199M 1, STHR-199X3 1, LTHR-199M 1, JTHR-199M 1, ATHR-199X3 1, LTHR-199X3 1, GT15THR-199M 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State RTHR-199X3 1, STHR-199M 1, GTHR-199M 1, MTHR-199X3 1, GT15THR-199X3 1, JTHR-199X3 1, ATHR-199M 1, MTHR-199M 1, GTHR-199X3 1, RTHR-199M 1, STHR-199X3 1, LTHR-199M 1, JTHR-199M 1, ATHR-199X3 1, LTHR-199X3 1, GT15THR-199M 1	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi GT-540X3-NEH 1, GTS-540-NEH 1, GT15-540-NO 1, TCT-199O-N 1, ACT-199O-N 1, ATO-540HX3-N 1, LTO-540H-N 1, GTS-540P-NEH 1, TS-540-GEH 1, ATO-540P-N 1, MCT-199O-N 1, TS-540X3-GEH 1, LTO-540P-N 1, SCT-199O-N 1, TS-540P-GEH 1, GT-540-NEH 1, GTS-540X3-NEH 1, TK-540P-NEH 1, T-H3-OS-N 1, LCT-199O-N 1, ATO-540H 1, LTO-540HX3-N 1, GT-540P-NEH 1**	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi GTS-540X3-PEH 11, TS-540X3-LEH 11, TK-540P-PEH 11, ATO-540HX3-P 11, ATO-540H 11, ACT-199O-P 11, ATO-540P-P 11, TS-540-LEH 11, TCT-199O-P 11, MCT-199O-P 11, LTO-540P-P 11, GT-540P-PEH 11, T-H3-OS-P 11, TS-540P-LEH 11, GTS-540-PEH 11, LTO-540HX3-P 11, LCT-199O-P 11, LTO-540H-P 11, GTS-540P-PEH 11, GT-540-PEH 11, GT-540X3-PEH 11, SCT-199O-P 11	View System

Conventional Electric Ain't Efficient!

Guess what!? Conventional electric Water Heaters are not efficient enough for Energy Star to certify them, and these days, there's no reason not to get a heat pump water heater, so you won't find any here.