waterheaterspecs

A.O. Smith Corporation

A.O. Smith Corporation is the ENERGY STAR partner of record for 456 certified model numbers in 32 rating sets (216 heat-pump, 204 gas tankless, 32 gas storage, 4 residential-duty commercial gas storage), under 13 brand names. Among the 9 medium-draw heat-pump sets here, A. O. Smith HPS10-50H45DV 2 has the highest UEF, 3.80. The shortest heat-pump tank listed, 33 in tall, is A. O. Smith HPACO-45 1+AXST-50LBTTP 1. CO2 (R-744) refrigerant runs in 84 of this partner’s 216 heat-pump model numbers. The largest rating set here, A. O. Smith ACT-199O-N 1, covers 51 model numbers sold as A. O. Smith, American, Lochinvar, Reliance, State and Takagi.

Certified models as of October 27, 2026 · Open these sets in the Heater finder

First-hour rating against rated volume, this partner against the rest of the heat-pump list

Listed hereOther heat-pump sets

First-hour rating, gal

First-hour rating against rated volume, this partner against the rest of the heat-pump list40608010012014030405060708090100110120Rated volume, gal1×1.5×American Standard ASHPWH-40American Standard ASHPWH-50American Standard ASHPWH-65American Standard ASHPWH-80Arctic Arctic-HP-Hot Water-KA06-50Arctic Arctic-HP-Hot Water-KA06-80Ariston ARIHPWH-40-TAriston ARIHPWH-50-TAriston ARIHPWH-65-TAriston ARIHPWH-80-TBradford White RE2H50S-Bradford White RE2H65T-Bradford White RE2H80T-Bradford White RE2HP50-1NCTTBradford White RE2HP65-1NCTTBradford White RE2HP80-1NCTTCarnot Labs N51Eco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1AFriedrich PROH40 T2 FD310BMFriedrich PROH50 T2 FD310BMFriedrich PROH65 T2 FD310BMFriedrich PROH80 T2 FD310BMGE Profile PF40S10FPY01GE Profile PF50S10FPY01GE Profile PF65S10FPY01GE Profile PF80S10FPY01GE Profile PH40S10BPY01GE Profile PH50S10BNY01GE Profile PH50S10BPY01GE Profile PH65S10BNY01GE Profile PH65S10BPY01GE Profile PH80S10BNY01GE Profile PH80S10BPY01Gree GRS-3.0Pd/TD50GANhA-DGree GRS-3.0Pd/TD70GANhA-DLG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802DMidea CAN3-RSJ-15/190RDVN3-L3Midea CAN3-RSJ-15/190RDVN3-L4Midea CAN3-RSJ-15/250RDVN3-L3Midea CAN3-RSJ-15/250RDVN3-L4Midea CAN3-RSJ-15/300RDVN3-L3Midea CAN3-RSJ-15/300RDVN3-L4Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMBReclaim Energy MP120F-RCReclaim Energy MP80F-RCRheem PROPH40 T0 RH120-MRheem PROPH40 T2 RH375-15Rheem PROPH40 T2 RH375-30Rheem PROPH50 T0 RH120Rheem PROPH50 T0 RH120-MRheem PROPH50 T2 RH375-15Rheem PROPH50 T2 RH375-30Rheem PROPH65 T0 RH120-MRheem PROPH65 T2 RH375-15Rheem PROPH65 T2 RH375-30Rheem PROPH80 T0 RH120-MRheem PROPH80 T2 RH375-15Rheem PROPH80 T2 RH375-30Rinnai REHP50Rinnai REHP80SanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBSmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80Vaughn Thermal ME120HPTVaughn Thermal ME50HPTVaughn Thermal ME65HPTVaughn Thermal ME80HPTVaughn Thermal MP120FHPTVaughn Thermal MP55FHPTVaughn Thermal MP80FHPTGiant GTHPCO-45 1+GTXST-50S 1A. O. Smith HPACO-45 1+AXST-66 1A. O. Smith HPACO-45 1+AXST-80 1A. O. Smith GC6-PS4050V 1A. O. Smith GC6-PS5065V 1A. O. Smith HP1080H45DV 1A. O. Smith HP1050H45DV 1A. O. Smith HPACO-45 1+AXST-50T 1A. O. Smith HPTU-66CTA 1A. O. Smith CAHP-40 2A. O. Smith CAHP-50 2A. O. Smith CAHP-66 2A. O. Smith CAHP-80 2A. O. Smith HPACO-45 1+AXST-50LBTTP 1A. O. Smith HPS10-50H45DV 2A. O. Smith HPS10-66H45DV 2A. O. Smith HPS10-80H45DV 2A. O. Smith HPTV-50 2A. O. Smith HPTV-66 2A. O. Smith HPTV-80 2A. O. Smith FPTU-50 1A. O. Smith FPTU-66 1A. O. Smith FPTU-80 1American PG10 34 100 2V 2A. O. Smith HPS10-80H45DV 2
First-hour rating against rated volume, this partner against the rest of the heat-pump list406080100120140306090120Rated volume, galAmerican Standard ASHPWH-40American Standard ASHPWH-50American Standard ASHPWH-65American Standard ASHPWH-80Arctic Arctic-HP-Hot Water-KA06-50Arctic Arctic-HP-Hot Water-KA06-80Ariston ARIHPWH-40-TAriston ARIHPWH-50-TAriston ARIHPWH-65-TAriston ARIHPWH-80-TBradford White RE2H50S-Bradford White RE2H65T-Bradford White RE2H80T-Bradford White RE2HP50-1NCTTBradford White RE2HP65-1NCTTBradford White RE2HP80-1NCTTCarnot Labs N51Eco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1AFriedrich PROH40 T2 FD310BMFriedrich PROH50 T2 FD310BMFriedrich PROH65 T2 FD310BMFriedrich PROH80 T2 FD310BMGE Profile PF40S10FPY01GE Profile PF50S10FPY01GE Profile PF65S10FPY01GE Profile PF80S10FPY01GE Profile PH40S10BPY01GE Profile PH50S10BNY01GE Profile PH50S10BPY01GE Profile PH65S10BNY01GE Profile PH65S10BPY01GE Profile PH80S10BNY01GE Profile PH80S10BPY01Gree GRS-3.0Pd/TD50GANhA-DGree GRS-3.0Pd/TD70GANhA-DLG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802DMidea CAN3-RSJ-15/190RDVN3-L3Midea CAN3-RSJ-15/190RDVN3-L4Midea CAN3-RSJ-15/250RDVN3-L3Midea CAN3-RSJ-15/250RDVN3-L4Midea CAN3-RSJ-15/300RDVN3-L3Midea CAN3-RSJ-15/300RDVN3-L4Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMBReclaim Energy MP120F-RCReclaim Energy MP80F-RCRheem PROPH40 T0 RH120-MRheem PROPH40 T2 RH375-15Rheem PROPH40 T2 RH375-30Rheem PROPH50 T0 RH120Rheem PROPH50 T0 RH120-MRheem PROPH50 T2 RH375-15Rheem PROPH50 T2 RH375-30Rheem PROPH65 T0 RH120-MRheem PROPH65 T2 RH375-15Rheem PROPH65 T2 RH375-30Rheem PROPH80 T0 RH120-MRheem PROPH80 T2 RH375-15Rheem PROPH80 T2 RH375-30Rinnai REHP50Rinnai REHP80SanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBSmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80Vaughn Thermal ME120HPTVaughn Thermal ME50HPTVaughn Thermal ME65HPTVaughn Thermal ME80HPTVaughn Thermal MP120FHPTVaughn Thermal MP55FHPTVaughn Thermal MP80FHPTGiant GTHPCO-45 1+GTXST-50S 1A. O. Smith HPACO-45 1+AXST-66 1A. O. Smith HPACO-45 1+AXST-80 1A. O. Smith GC6-PS4050V 1A. O. Smith GC6-PS5065V 1A. O. Smith HP1080H45DV 1A. O. Smith HP1050H45DV 1A. O. Smith HPACO-45 1+AXST-50T 1A. O. Smith HPTU-66CTA 1A. O. Smith CAHP-40 2A. O. Smith CAHP-50 2A. O. Smith CAHP-66 2A. O. Smith CAHP-80 2A. O. Smith HPACO-45 1+AXST-50LBTTP 1A. O. Smith HPS10-50H45DV 2A. O. Smith HPS10-66H45DV 2A. O. Smith HPS10-80H45DV 2A. O. Smith HPTV-50 2A. O. Smith HPTV-66 2A. O. Smith HPTV-80 2A. O. Smith FPTU-50 1A. O. Smith FPTU-66 1A. O. Smith FPTU-80 1American PG10 34 100 2V 2A. O. Smith
Each circle is one rating set; filled circles grow with the number of model numbers. Dashed lines mark first-hour output of 1× and 1.5× the rated volume.

Rating sets by type

Heat pump, 21 rating sets

Heat-pump rating sets by draw pattern
Rating setRated volumeFirst-hour ratingUEFEnergyRefrigerantLow cut-off
High draw pattern12 of the 58 high-draw heat-pump sets
A. O. Smith CAHP-80 2Also listed as American, Lochinvar, Reliance, State
Show 9 model numbers
  • A. O. Smith CAHP-80 2**, HPA10-80H45DV 2**, HPTA-80 2**
  • American HPA10280H045DV 2**
  • Lochinvar CHPA-80 2**, HPPA080KD 2**
  • Reliance 10-80-DHPTA 2**
  • State CSHP-80 2**, HPAX-80-DHPT 2**
81 gal95 gal3.881,279 kWh/yrR-134a37 °F
A. O. Smith HPS10-80H45DV 2Also listed as American, Lochinvar, Reliance, State
Show 7 model numbers
  • A. O. Smith HPS10-80H45DV 2**, HPSN10-80H45DV 2**, HPTS-80 2**
  • American HPS10280H045DV 2**
  • Lochinvar HPSA080KD 2**
  • Reliance 10-80-DHPTS 2**
  • State HPSX-80-DHPT 2**
82 gal95 gal3.881,279 kWh/yrR-134a37 °F
A. O. Smith CAHP-66 2Also listed as American, Lochinvar, Reliance, State
Show 9 model numbers
  • A. O. Smith CAHP-66 2**, HPA10-66H45DV 2**, HPTA-66 2**
  • American HPA10266H045DV 2**
  • Lochinvar CHPA-66 2**, HPPA065KD 2**
  • Reliance 10-66-DHPTA 2**
  • State CSHP-66 2**, HPAX-66-DHPT 2**
68 gal83 gal3.841,292 kWh/yrR-134a37 °F
A. O. Smith HPACO-45 1+AXST-80 1Also listed as American, GSW, Giant, John Wood, Lochinvar, Reliance, State
Show 18 model numbers
  • A. O. Smith HPACO-45 1**+AXST-80 1**, HPACO-45 1**+AXST-80TTP 1**, HPACO-45C 1**+AXST-80C 1**, HPACO-45C 1**+AXST-80CTTP 1**
  • American MHPCO-45 1**+MXST-80 1**, MHPCO-45 1**+MXST-80TTP 1**
  • GSW GHPCO-45 1**+GXST-80 1**, GHPCO-45 1**+GXST-80TTP 1**
  • Giant GTHPCO-45 1**+GTXST-80 1**, GTHPCO-45 1**+GTXST-80TTP 1**
  • John Wood JWHPCO-45 1**+JWXST-80 1**, JWHPCO-45 1**+JWXST-80TTP 1**
  • Lochinvar LHPCO-45 1**+LXST-80 1**, LHPCO-45 1**+LXST-80TTP 1**
  • Reliance RHPCO-45 1**+RXST-80 1**, RHPCO-45 1**+RXST-80G 1**
  • State SHPCO-45 1**+SXST-80 1**, SHPCO-45 1**+SXST-80G 1**
73 gal95 gal3.801,306 kWh/yrR-744not listed
A. O. Smith HPACO-45 1+AXST-66 1Also listed as American, GSW, Giant, John Wood, Lochinvar, Reliance, State
Show 18 model numbers
  • A. O. Smith HPACO-45 1**+AXST-66 1**, HPACO-45 1**+AXST-66TTP 1**, HPACO-45C 1**+AXST-66C 1**, HPACO-45C 1**+AXST-66CTTP 1**
  • American MHPCO-45 1**+MXST-66 1**, MHPCO-45 1**+MXST-66TTP 1**
  • GSW GHPCO-45 1**+GXST-66 1**, GHPCO-45 1**+GXST-66TTP 1**
  • Giant GTHPCO-45 1**+GTXST-66 1**, GTHPCO-45 1**+GTXST-66TTP 1**
  • John Wood JWHPCO-45 1**+JWXST-66 1**, JWHPCO-45 1**+JWXST-66TTP 1**
  • Lochinvar LHPCO-45 1**+LXST-66 1**, LHPCO-45 1**+LXST-66TTP 1**
  • Reliance RHPCO-45 1**+RXST-66 1**, RHPCO-45 1**+RXST-66G 1**
  • State SHPCO-45 1**+SXST-66 1**, SHPCO-45 1**+SXST-66G 1**
60 gal82 gal3.701,341 kWh/yrR-744not listed
A. O. Smith HPS10-66H45DV 2Also listed as American, Lochinvar, Reliance, State
Show 7 model numbers
  • A. O. Smith HPS10-66H45DV 2**, HPSN10-66H45DV 2**, HPTS-66 2**
  • American HPS10266H045DV 2**
  • Lochinvar HPSA065KD 2**
  • Reliance 10-66-DHPTS 2**
  • State HPSX-66-DHPT 2**
67 gal82 gal3.701,233 kWh/yrR-134a37 °F
A. O. Smith FPTU-80 1Also listed as American, Reliance, State, U.S. Craftmaster
Show 5 model numbers
  • A. O. Smith FPTU-80 1**
  • American HPHE6280H045DV 1**
  • Reliance 6-80-DHPHT 1**
  • State HP6-80-DHPT 1**
  • U.S. Craftmaster HPHE2F80HD045VU 1**
82 gal84 gal3.451,396 kWh/yrR-134a45 °F
A. O. Smith HP1080H45DV 1Also listed as American, Lochinvar, Reliance, State, U.S. Craftmaster
Show 15 model numbers
  • A. O. Smith HP1080H45DV 1**, HP1080H45DVCTA-1**, HPTU-80CTA 1**, HPTU-80DR 1**, HPTU-80N 1**
  • American HPHE10280H045DVCTA-1**, HPHE10280H045DVDR 1**, HPHE10280H045DVN 1**
  • Lochinvar HPA082KD 1**
  • Reliance 10-80-DHPHTCTA 1**, 10-80-DHPHTNE 1**
  • State HPX-80-DHPTCTA 1**, HPX-80-DHPTDR 1**, HPX-80-DHPTNE 1**
  • U.S. Craftmaster HPHE2K80HD045VUN 1**
82 gal86 gal3.451,387 kWh/yrR-134a45 °F
A. O. Smith HPTU-66CTA 1Also listed as American, Lochinvar, Reliance, State, U.S. Craftmaster
Show 13 model numbers
  • A. O. Smith HPTU-66CTA 1**, HPTU-66DR 1**, HPTU-66N 1**
  • American HPHE10266H045DVCTA-1**, HPHE10266H045DVDR 1**, HPHE10266H045DVN 1**
  • Lochinvar HPA068KD 1**
  • Reliance 10-66-DHPHTCTA 1**, 10-66-DHPHTNE 1**
  • State HPX-66-DHPTCTA 1**, HPX-66-DHPTDR 1**, HPX-66-DHPTNE 1**
  • U.S. Craftmaster HPHE2K66HD045VUN 1**
67 gal79 gal3.451,381 kWh/yrR-134a45 °F
A. O. Smith FPTU-66 1Also listed as American, Reliance, State, U.S. Craftmaster
Show 5 model numbers
  • A. O. Smith FPTU-66 1**
  • American HPHE6266H045DV 1**
  • Reliance 6-66-DHPHT 1**
  • State HP6-66-DHPT 1**
  • U.S. Craftmaster HPHE2F66HD045VU 1**
67 gal79 gal3.421,391 kWh/yrR-134a45 °F
A. O. Smith HPTV-66 2Also listed as American, Lochinvar, Reliance, State
Show 6 model numbers
  • A. O. Smith HPTV-66 2**, HPV10-66H01DV 2**
  • American HPV10266H009DV 2**
  • Lochinvar HPV065KD 2**
  • Reliance 10-66-DHPTV 2**
  • State HPVX-66-DHPT 2**
68 gal76 gal3.201,550 kWh/yrR-513A37 °F
A. O. Smith HPTV-80 2Also listed as American, Lochinvar, Reliance, State
Show 6 model numbers
  • A. O. Smith HPTV-80 2**, HPV10-80H01DV 2**
  • American HPV10280H009DV 2**
  • Lochinvar HPV080KD 2**
  • Reliance 10-80-DHPTV 2**
  • State HPVX-80-DHPT 2**
82 gal93 gal3.001,654 kWh/yrR-513A37 °F
Medium draw pattern9 of the 38 medium-draw heat-pump sets
A. O. Smith HPS10-50H45DV 2Also listed as American, Lochinvar, Reliance, State
Show 7 model numbers
  • A. O. Smith HPS10-50H45DV 2**, HPSN10-50H45DV 2**, HPTS-50 2**
  • American HPS10250H045DV 2**
  • Lochinvar HPSA050KD 2**
  • Reliance 10-50-DHPTS 2**
  • State HPSX-50-DHPT 2**
46 gal65 gal3.80831 kWh/yrR-134a37 °F
A. O. Smith CAHP-50 2Also listed as American, Lochinvar, Reliance, State
Show 9 model numbers
  • A. O. Smith CAHP-50 2**, HPA10-50H45DV 2**, HPTA-50 2**
  • American HPA10250H045DV 2**
  • Lochinvar CHPA-50 2**, HPPA050KD 2**
  • Reliance 10-50-DHPTA 2**
  • State CSHP-50 2**, HPAX-50-DHPT 2**
46 gal65 gal3.68883 kWh/yrR-134a37 °F
A. O. Smith CAHP-40 2Also listed as American, Lochinvar, Reliance, State
Show 9 model numbers
  • A. O. Smith CAHP-40 2**, HPA10-40H45DV 2**, HPTA-40 2**
  • American HPA10240H045DV 2**
  • Lochinvar CHPA-40 2**, HPPA040KD 2**
  • Reliance 10-40-DHPTA 2**
  • State CSHP-40 2**, HPAX-40-DHPT 2**
36 gal55 gal3.60902 kWh/yrR-134a37 °F
A. O. Smith HPACO-45 1+AXST-50LBTTP 1Also listed as American, GSW, Giant, John Wood, Lochinvar, Reliance, State
Show 9 model numbers
  • A. O. Smith HPACO-45 1**+AXST-50LBTTP 1**, HPACO-45C 1**+AXST-50LBCTTP 1*
  • American MHPCO-45 1**+MXST-50LBTTP 1**
  • GSW GHPCO-45 1**+GXST-50LBTTP 1**
  • Giant GTHPCO-45 1**+GTXST-50LBTTP 1*
  • John Wood JWHPCO-45 1**+JWXST-50LBTTP 1*
  • Lochinvar LHPCO-45 1**+LXST-50LBTTP 1**
  • Reliance RHPCO-45 1**+RXST-50LBG 1**
  • State SHPCO-45 1**+SXST-50LBG 1**
48 gal72 gal3.55915 kWh/yrR-744not listed
A. O. Smith HPACO-45 1+AXST-50T 1Also listed as American, John Wood, Lochinvar, Reliance, State
Show 14 model numbers
  • A. O. Smith HPACO-45 1**+AXST-50T 1**, HPACO-45 1**+AXST-50TTTP 1**, HPACO-45C 1**+AXST-50TC 1**, HPACO-45C 1**+AXST-50TCTTP 1**
  • American MHPCO-45 1**+MXST-50T 1**, MHPCO-45 1**+MXST-50TTTP 1**
  • John Wood JWHPCO-45 1**+JWXST-50T 1**, JWHPCO-45 1**+JWXST-50TTTP 1**
  • Lochinvar LHPCO-45 1**+LXST-50T 1**, LHPCO-45 1**+LXST-50TTTP 1**
  • Reliance RHPCO-45 1**+RXST-50T 1**, RHPCO-45 1**+RXST-50TG 1**
  • State SHPCO-45 1**+SXST-50T 1**, SHPCO-45 1**+SXST-50TG 1**
45 gal67 gal3.52923 kWh/yrR-744not listed
Giant GTHPCO-45 1+GTXST-50S 1Also listed as A. O. Smith, American, GSW, John Wood, Lochinvar, Reliance, State
Show 25 model numbers
  • A. O. Smith HPACO-45 1**+AXST-50S 1**, HPACO-45 1**+AXST-50STTP 1**, HPACO-45C 1**+AXST-50SC 1**, HPACO-45C 1**+AXST-50SCTTP 1**
  • American MHPCO-45 1**+MXST-50S 1**, MHPCO-45 1**+MXST-50STTP 1**
  • GSW GHPCO-45 1**+GXST-50S 1*, GHPCO-45 1**+GXST-50S 1**, GHPCO-45 1**+GXST-50STTP 1*, GHPCO-45 1**+GXST-50STTP 1**, GHPCO-45 1**+GXST-50T 1**, GHPCO-45 1**+GXST-50TTTP 1**
  • Giant GTHPCO-45 1**+GTXST-50S 1*, GTHPCO-45 1**+GTXST-50S 1**, GTHPCO-45 1**+GTXST-50STTP 1*, GTHPCO-45 1**+GTXST-50STTP 1**, GTHPCO-45 1**+GTXST-50T 1**, GTHPCO-45 1**+GTXST-50TTTP 1**
  • John Wood JWHPCO-45 1**+JWXST-50STTP 1**
  • Lochinvar LHPCO-45 1**+LXST-50S 1**, LHPCO-45 1**+LXST-50STTP 1**
  • Reliance RHPCO-45 1**+RXST-50S 1**, RHPCO-45 1**+RXST-50SG 1**
  • State SHPCO-45 1**+SXST-50S 1**, SHPCO-45 1**+SXST-50SG 1**
46 gal70 gal3.52923 kWh/yrR-744not listed
A. O. Smith HP1050H45DV 1Also listed as American, Lochinvar, Reliance, State, U.S. Craftmaster
Show 14 model numbers
  • A. O. Smith HP1050H45DV 1**, HP1050H45DVCTA-1**, HPTU-50CTA 1**, HPTU-50DR 1**, HPTU-50N 1**
  • American HPHE10250H045DVCTA-1**, HPHE10250H045DVDR 1**, HPHE10250H045DVN 1**
  • Lochinvar HPA052KD 1**
  • Reliance 10-50-DHPHTCTA 1**, 10-50-DHPHTNE 1**
  • State HPX-50-DHPTCTA 1**, HPX-50-DHPTNE 1**
  • U.S. Craftmaster HPHE2K50HD045VUN 1**
46 gal66 gal3.45902 kWh/yrR-134a45 °F
A. O. Smith FPTU-50 1Also listed as American, Reliance, State, U.S. Craftmaster
Show 5 model numbers
  • A. O. Smith FPTU-50 1**
  • American HPHE6250H045DV 1**
  • Reliance 6-50-DHPHT 1**
  • State HP6-50-DHPT 1**
  • U.S. Craftmaster HPHE2F50HD045VU 1**
46 gal66 gal3.35970 kWh/yrR-134a45 °F
A. O. Smith HPTV-50 2Also listed as American, Lochinvar, Reliance, State
Show 6 model numbers
  • A. O. Smith HPTV-50 2**, HPV10-50H01DV 2**
  • American HPV10250H009DV 2**
  • Lochinvar HPV050KD 2**
  • Reliance 10-50-DHPTV 2**
  • State HPVX-50-DHPT 2**
46 gal52 gal3.001,550 kWh/yrR-513A37 °F

Gas tankless, 8 rating sets

Gas tankless rating sets by gas input
Rating setMax flow, 67 °F riseGas inputUEF, drawGas useFuel
199,000 Btu/h3 sets
A. O. Smith ATM-199M-N 1Also listed as American, Lochinvar, Reliance, StateHighest max flow of the 40 gas tankless sets, tied with 1 other
Show 14 model numbers
  • A. O. Smith ATM-199M-N 1**, ATM-199X3-N 1**, GT15TM-199M-N, GT15TM-199M-N 1**, GT15TM-199X3-N, GT15TM-199X3-N 1**
  • American MTM-199M-N 1**, MTM-199X3-N 1**
  • Lochinvar LTM-199M-N 1**, LTM-199X3-N 1**
  • Reliance RTM-199M-N 1**, RTM-199X3-N 1**
  • State STM-199M-N 1**, STM-199X3-N 1**
6.0 gal/min199,000 Btu/h0.95 high178 therms/yrnatural gas only
A. O. Smith ATHR-199M 1Also listed as American, Lochinvar, Reliance, State
Show 12 model numbers
  • A. O. Smith ATHR-199M 1**, ATHR-199X3 1**, GT15THR-199M 1**, GT15THR-199X3 1**
  • American MTHR-199M 1**, MTHR-199X3 1**
  • Lochinvar LTHR-199M 1**, LTHR-199X3 1**
  • Reliance RTHR-199M 1**, RTHR-199X3 1**
  • State STHR-199M 1**, STHR-199X3 1**
5.9 gal/min199,000 Btu/h0.95 high178 therms/yrnatural gas or propane
A. O. Smith ACT-199O-N 1Also listed as American, Lochinvar, Reliance, State, Takagi
Show 51 model numbers
  • A. O. Smith ACT-199O-N 1**, ACT-199O-P 1*1, ACTH-199M-(N,P) 1**, ATO-540H 1**, ATO-540H 1*1, ATO-540HX3-N 1**, ATO-540HX3-P 1*1, ATO-540P-N 1**, ATO-540P-P 1*1, GT15-540-NO 1**
  • American GT-540-NEH 1**, GT-540-PEH 1*1, GT-540P-NEH 1**, GT-540P-PEH 1*1, GT-540X3-NEH 1**, GT-540X3-PEH 1*1, MCT-199O-N 1**, MCT-199O-P 1*1, MCTH-199M-(N,P) 1**
  • Lochinvar LCT-199O-N 1**, LCT-199O-P 1*1, LCTH-199M-(N,P) 1**, LTO-540H-N 1**, LTO-540H-P 1*1, LTO-540HX3-N 1**, LTO-540HX3-P 1*1, LTO-540P-N 1**, LTO-540P-P 1*1
  • Reliance TS-540-GEH 1**, TS-540-LEH 1*1, TS-540P-GEH 1**, TS-540P-LEH 1*1, TS-540X3-GEH 1**, TS-540X3-LEH 1*1
  • State GTS-540-NEH 1**, GTS-540-PEH 1*1, GTS-540P-NEH 1**, GTS-540P-PEH 1*1, GTS-540X3-NEH 1**, GTS-540X3-PEH 1*1, SCT-199O-N 1**, SCT-199O-P 1*1, SCTH-199M-(N,P) 1**
  • Takagi T-H3-OS-N 1**, T-H3-OS-P 1*1, TCT-199O-N 1**, TCT-199O-P 1*1, TK-540P-NEH 1**, TK-540P-PEH 1*1, TK-540X3-NEH 1**, TK-540X3-PEH 1*1
5.8 gal/min199,000 Btu/h0.95 high178 therms/yrnatural gas or propane
170,000 to 189,000 Btu/h2 sets
A. O. Smith ATI-340H 1Also listed as American, Lochinvar, Reliance, State, Takagi
Show 40 model numbers
  • A. O. Smith ATI-340H 1**, ATI-340H 1*1, ATI-340HX3-N 1**, ATI-340HX3-P 1*1, ATM-180M-N 1**, ATM-180X3-N 1**, GT15-340-NI 1**, GT15-340-PI 1*1, GT15TM-180M-N, GT15TM-180M-N 1**, GT15TM-180X3-N, GT15TM-180X3-N 1**
  • American GT-340-NIH 1**, GT-340-PIH 1*1, GT-340X3-NIH 1**, GT-340X3-PIH 1*1, MTM-180M-N 1**, MTM-180X3-N 1**
  • Lochinvar LTI-340H-N 1**, LTI-340H-P 1*1, LTI-340X3-N 1**, LTI-340X3-P 1*1, LTM-180M-N 1**, LTM-180X3-N 1**
  • Reliance RTM-180M-N 1**, RTM-180X3-N 1**, TS-340-GIH 1**, TS-340-LIH 1*1, TS-340X3-GIH 1**, TS-340X3-LIH 1*1
  • State GTS-340-NIH 1**, GTS-340-PIH 1*1, GTS-340X3-NIH 1**, GTS-340X3-PIH 1*1, STM-180M-N 1**, STM-180X3-N 1**
  • Takagi T-H3S-DV-N 1**, T-H3S-DV-P 1*1, TK-340X3-NIH 1**, TK-340X3-PIH 1*1
5.4 gal/min180,000 Btu/h0.95 high178 therms/yrnatural gas or propane
A. O. Smith ATHR-180M 1Also listed as American, Lochinvar, Reliance, State
Show 12 model numbers
  • A. O. Smith ATHR-180M 1**, ATHR-180X3 1**, GT15THR-180M 1**, GT15THR-180X3 1**
  • American MTHR-180M 1**, MTHR-180X3 1**
  • Lochinvar LTHR-180M 1**, LTHR-180X3 1**
  • Reliance RTHR-180M 1**, RTHR-180X3 1**
  • State STHR-180M 1**, STHR-180X3 1**
5.3 gal/min180,000 Btu/h0.95 high178 therms/yrnatural gas or propane
160,000 to 169,000 Btu/h2 sets
A. O. Smith ATHR-160M 1Also listed as American, Lochinvar, Reliance, State
Show 38 model numbers
  • A. O. Smith ATHR-160M 1**, ATHR-160X3 1**, ATM-160M-N 1**, ATM-160M-P 1*1, ATM-160X3-N 1**, ATM-160X3-P 1*1, GT15THR-160M 1**, GT15THR-160X3 1**, GT15TM-160M-N, GT15TM-160M-N 1**, GT15TM-160M-P 1*1, GT15TM-160X3-N, GT15TM-160X3-N 1**, GT15TM-160X3-P 1*1
  • American MTHR-160M 1**, MTHR-160X3 1**, MTM-160M-N 1**, MTM-160M-P 1*1, MTM-160X3-N 1**, MTM-160X3-P 1*1
  • Lochinvar LTHR-160M 1**, LTHR-160X3 1**, LTM-160M-N 1**, LTM-160M-P 1*1, LTM-160X3-N 1**, LTM-160X3-P 1*1
  • Reliance RTHR-160M 1**, RTHR-160X3 1**, RTM-160M-N 1**, RTM-160M-P 1*1, RTM-160X3-N 1**, RTM-160X3-P 1*1
  • State STHR-160M 1**, STHR-160X3 1**, STM-160M-N 1**, STM-160M-P 1*1, STM-160X3-N 1**, STM-160X3-P 1*1
4.8 gal/min160,000 Btu/h0.95 high178 therms/yrnatural gas or propane
A. O. Smith ATO-240H 1Also listed as American, Lochinvar, Reliance, State, Takagi
Show 26 model numbers
  • A. O. Smith ATO-240H 1**, ATO-240H 1*1, ATO-240HX3-N 1**, ATO-240HX3-P 1*1, GT15-240-NO 1**, GT15-240-PO 1*1
  • American GT-240-NEH 1**, GT-240-PEH 1*1, GT-240X3-NEH 1**, GT-240X3-PEH 1*1
  • Lochinvar LTO-240H-N 1**, LTO-240H-P 1*1, LTO-240X3-N 1**, LTO-240X3-P 1*1
  • Reliance TS-240-GEH 1**, TS-240-LEH 1*1, TS-240X3-GEH 1**, TS-240X3-LEH 1*1
  • State GTS-240-NEH 1**, GTS-240-PEH 1*1, GTS-240X3-NEH 1**, GTS-240X3-PEH 1*1
  • Takagi T-H3J-OS-N 1**, T-H3J-OS-P 1*1, TK-240X3-NEH 1**, TK-240X3-PEH 1*1
4.7 gal/min160,000 Btu/h0.95 high178 therms/yrnatural gas or propane
Under 160,000 Btu/h1 set
A. O. Smith ATM-140M-N 1Also listed as American, Lochinvar, Reliance, State
Show 11 model numbers
  • A. O. Smith ATM-140M-N 1**, ATM-140X3-N 1**, GT15TM-140M-N 1**
  • American MTM-140M-N 1**, MTM-140X3-N 1**
  • Lochinvar LTM-140M-N 1**, LTM-140X3-N 1**
  • Reliance RTM-140M-N 1**, RTM-140X3-N 1**
  • State STM-140M-N 1**, STM-140X3-N 1**
4.1 gal/min140,000 Btu/h0.95 high178 therms/yrnatural gas only

Gas storage, 3 rating sets

Gas storage rating sets
Rating setRated volumeFirst-hour ratingUEFGas useGas inputFuel
Gas storage2 of 4 sets, all high draw
A. O. Smith GC6-PS5065V 1Also listed as American, Envirosense, Envirosense Enercare, Envirosense Reliance Home Comfort, Lochinvar, Reliance, State
Show 16 model numbers
  • A. O. Smith GC6-PS5065*V 1**, GC9-PS5065NV 1**, GPCC-50X 1**, GPCX-50L 1**, HPCX-50L 1**
  • American PCG62-50S65L 1**, PCG82-50S65L 1**
  • Envirosense ENV-50N 1**, ENV-50P 1**
  • Envirosense Enercare ENV-50N-ENER 1**
  • Envirosense Reliance Home Comfort ENV-50N-RHC 1**
  • Lochinvar LHPCX-50L 1**
  • Reliance 6-50-*XPCS 1**, 9-50-YXPCS 1**
  • State GP6-50-*XPCSL 1**, GP8-50-YXPCSL 1**
49 gal118 gal0.90188 therms/yr65,000 Btu/hnatural gas or propane
A. O. Smith GC6-PS4050V 1Also listed as American, Envirosense, Envirosense Enercare, Envirosense Reliance Home Comfort, Lochinvar, Reliance, State
Show 16 model numbers
  • A. O. Smith GC6-PS4050*V 1**, GC9-PS4050NV 1**, GPCC-40L 1**, GPCT-40L 1**, HPCT-40L 1**
  • American PCG62-40S50L 1**, PCG82-40S50L 1**
  • Envirosense ENV-40N 1**, ENV-40P 1**
  • Envirosense Enercare ENV-40N-ENER 1**
  • Envirosense Reliance Home Comfort ENV-40N-RHC 1**
  • Lochinvar LHPCT-40L 1**
  • Reliance 6-40-*RPCS 1**, 9-40-YRPCS 1**
  • State GP6-40-*RPCSL 1**, GP8-40-YRPCSL 1**
38 gal86 gal0.90188 therms/yr50,000 Btu/hnatural gas or propane
Gas storage, residential-duty commercial1 of 15 sets, all high draw
American PG10 34 100 2V 2Also listed as A. O. Smith, State
Show 4 model numbers
  • A. O. Smith GSP-100 2**
  • American PG10 34 100 2*V 2**, PR-34-100 * 2**
  • State GHX-34-100 N 2**
33 gal170 gal0.90188 therms/yr100,000 Btu/hnatural gas or propane

One rating, eight brand names

25

model numbers here share every certified value of Giant GTHPCO-45 1+GTXST-50S 1: 46 gal rated, 70 gal first hour, UEF 3.52.

Why one rating set carries several brand names

Model numbers in that set, by brand

  • GSW6
  • Giant6
  • A. O. Smith4
  • American2
  • Lochinvar2
  • Reliance2
  • State2
  • John Wood1

Compressor cut-off

The listed lower cut-off is the air temperature below which the compressor stops and backup heat takes over. Of the 21 sets here, 16 report a single value, from 37 °F up to 45 °F.

Lowest compressor operating temperature by rating setListed here16 sets10 sets10A. O. Smith FPTU-50 1A. O. Smith FPTU-66 1A. O. Smith FPTU-80 1A. O. Smith HP1050H45DV 1A. O. Smith HP1080H45DV 1A. O. Smith HPTU-66CTA 1Other heat pumps74 setsSanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-83SSAQBSmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80Reclaim Energy MP120F-RCReclaim Energy MP80F-RCEco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1ALG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802D31 sets3125 sets25Carnot Labs N51Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMB−30 °F−20 °F−10 °F0 °F10 °F20 °F30 °F40 °F50 °F
Lowest compressor operating temperatureListed here16 sets10 sets10A. O. Smith FPTU-50 1A. O. Smith FPTU-66 1A. O. Smith FPTU-80 1A. O. Smith HP1050H45DV 1A. O. Smith HP1080H45DV 1A. O. Smith HPTU-66CTA 1Other heat pumps74 setsSanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-83SSAQBSmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80Reclaim Energy MP120F-RCReclaim Energy MP80F-RCEco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1ALG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802D31 sets3125 sets25Carnot Labs N51Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMB−20 °F0 °F20 °F40 °F
One dot per rating set; stacks taller than eight are drawn as a bar with the count.

Refrigerants

Counted by model number, 216 with a listed refrigerant.

Fuel listing

Counted by model number. Separate natural-gas and propane versions of one heater usually carry their own model numbers.

Brand names under this partner

Model numbers per brand and type, counted only where A.O. Smith Corporation is the partner of record.

BrandHeat pumpGas tanklessGas storageGas storage, residential-duty commercialAll
A. O. Smith6159101131
State34334172
American31334270
Reliance28304–62
Lochinvar26332–61
Takagi–16––16
GSW11–––11
Giant11–––11
John Wood8–––8
U.S. Craftmaster6–––6
Envirosense––4–4
Envirosense Enercare––2–2
Envirosense Reliance Home Comfort––2–2

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