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 HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	67 gal	4.02	A. O. Smith , American , Lochinvar , Reliance , State HPSX-66-DHPT 2, 10-66-DHPTS 2, HPS10266H045DV 2, HPSA065KD 2, HPTS-66 2, HPS10-66H45DV 2	View System
Heat Pump	81 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPTA-80 2, HPAX-80-DHPT 2, HPPA080KD 2, 10-80-DHPTA 2, HPA10-80H45DV 2, HPA10280H045DV 2	View System
Heat Pump	82 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPTS-80 2, HPSX-80-DHPT 2, HPSA080KD 2, 10-80-DHPTS 2, HPS10280H045DV 2, HPS10-80H45DV 2	View System
Heat Pump	81 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPTA-80 2, HPAX-80-DHPT 2, HPPA080KD 2, 10-80-DHPTA 2, HPA10-80H45DV 2, HPA10280H045DV 2	View System
Heat Pump	82 gal	3.88	A. O. Smith , American , Lochinvar , Reliance , State HPTS-80 2, HPSX-80-DHPT 2, HPSA080KD 2, 10-80-DHPTS 2, HPS10280H045DV 2, HPS10-80H45DV 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 ATO-540HX3-N 1, ACT-199O-N 1, T-H3-OS-N 1, TK-540P-NEH 1, ATO-540H 1, TS-540P-GEH 1, GTS-540X3-NEH 1, GTS-540-NEH 1, TCT-199O-N 1, GT-540X3-NEH 1, LTO-540H-N 1, SCT-199O-N 1, MCT-199O-N 1, ATO-540P-N 1, GT-540-NEH 1, LCT-199O-N 1, GTS-540P-NEH 1, LTO-540P-N 1, LTO-540HX3-N 1, TS-540X3-GEH 1, GT15-540-NO 1, TS-540-GEH 1, GT-540P-NEH 1**	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi LTO-540H-P 11, ATO-540HX3-P 11, GTS-540P-PEH 11, SCT-199O-P 11, ATO-540H 11, GT-540P-PEH 11, GTS-540X3-PEH 11, ACT-199O-P 11, TS-540P-LEH 11, TS-540-LEH 11, TS-540X3-LEH 11, TCT-199O-P 11, T-H3-OS-P 11, TK-540P-PEH 11, ATO-540P-P 11, LTO-540HX3-P 11, GT-540X3-PEH 11, MCT-199O-P 11, LTO-540P-P 11, LCT-199O-P 11, GT-540-PEH 11, GTS-540-PEH 11	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State LTHR-160M 1, MTHR-160X3 1, JTHR-160M 1, ATHR-160M 1, RTHR-160X3 1, MTHR-160M 1, JTHR-160X3 1, RTHR-160M 1, GT15THR-160X3 1, GTHR-160M 1, GTHR-160X3 1, LTHR-160X3 1, ATHR-160X3 1, STHR-160M 1, STHR-160X3 1, GT15THR-160M 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State LTHR-160M 1, MTHR-160X3 1, JTHR-160M 1, ATHR-160M 1, RTHR-160X3 1, MTHR-160M 1, JTHR-160X3 1, RTHR-160M 1, GT15THR-160X3 1, GTHR-160M 1, GTHR-160X3 1, LTHR-160X3 1, ATHR-160X3 1, STHR-160M 1, STHR-160X3 1, GT15THR-160M 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State ATHR-180X3 1, GTHR-180X3 1, GTHR-180M 1, LTHR-180X3 1, STHR-180X3 1, MTHR-180X3 1, MTHR-180M 1, LTHR-180M 1, RTHR-180M 1, GT15THR-180M 1, RTHR-180X3 1, GT15THR-180X3 1, STHR-180M 1, ATHR-180M 1, JTHR-180M 1, JTHR-180X3 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State ATHR-180X3 1, GTHR-180X3 1, GTHR-180M 1, LTHR-180X3 1, STHR-180X3 1, MTHR-180X3 1, MTHR-180M 1, LTHR-180M 1, RTHR-180M 1, GT15THR-180M 1, RTHR-180X3 1, GT15THR-180X3 1, STHR-180M 1, ATHR-180M 1, JTHR-180M 1, JTHR-180X3 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State GT15THR-199X3 1, LTHR-199M 1, JTHR-199X3 1, GTHR-199M 1, GTHR-199X3 1, MTHR-199M 1, GT15THR-199M 1, STHR-199M 1, RTHR-199M 1, JTHR-199M 1, ATHR-199X3 1, LTHR-199X3 1, STHR-199X3 1, RTHR-199X3 1, ATHR-199M 1, MTHR-199X3 1	View System
Gas Tankless	1 gal	0.95	A. O. Smith , American , GSW , John Wood , Lochinvar , Reliance , State GT15THR-199X3 1, LTHR-199M 1, JTHR-199X3 1, GTHR-199M 1, GTHR-199X3 1, MTHR-199M 1, GT15THR-199M 1, STHR-199M 1, RTHR-199M 1, JTHR-199M 1, ATHR-199X3 1, LTHR-199X3 1, STHR-199X3 1, RTHR-199X3 1, ATHR-199M 1, MTHR-199X3 1	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi ATO-540HX3-N 1, ACT-199O-N 1, T-H3-OS-N 1, TK-540P-NEH 1, ATO-540H 1, TS-540P-GEH 1, GTS-540X3-NEH 1, GTS-540-NEH 1, TCT-199O-N 1, GT-540X3-NEH 1, LTO-540H-N 1, SCT-199O-N 1, MCT-199O-N 1, ATO-540P-N 1, GT-540-NEH 1, LCT-199O-N 1, GTS-540P-NEH 1, LTO-540P-N 1, LTO-540HX3-N 1, TS-540X3-GEH 1, GT15-540-NO 1, TS-540-GEH 1, GT-540P-NEH 1**	View System
Gas Tankless	None gal	0.95	A. O. Smith , American , Lochinvar , Reliance , State , Takagi LTO-540H-P 11, ATO-540HX3-P 11, GTS-540P-PEH 11, SCT-199O-P 11, ATO-540H 11, GT-540P-PEH 11, GTS-540X3-PEH 11, ACT-199O-P 11, TS-540P-LEH 11, TS-540-LEH 11, TS-540X3-LEH 11, TCT-199O-P 11, T-H3-OS-P 11, TK-540P-PEH 11, ATO-540P-P 11, LTO-540HX3-P 11, GT-540X3-PEH 11, MCT-199O-P 11, LTO-540P-P 11, LCT-199O-P 11, GT-540-PEH 11, GTS-540-PEH 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.