waterheaterspecs

Split-system heat-pump water heaters

The split-system group holds 100 certified model numbers in 16 rating sets, from 13 brands. The highest first-hour rating among heat-pump water heaters, 134 gal, belongs to SanCO2 GS5-45HPC HP + ECO-119GLBK. Eco-Logical OMNI-50HP2-1A has the highest UEF of all 38 medium-draw heat-pump sets on the list, 4.23. Among the 8 high-draw heat-pump sets here, Eco-Logical OMNI-80HP2-1A has the highest UEF, 4.11. Of the group’s model numbers, 88% were certified in 2026, the largest share of the five heat-pump groups on this site.

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

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

Split systemOther heat-pump sets

First-hour rating, gal

First-hour rating against rated volume, this group against the rest of the heat-pump list40608010012014030405060708090100110120Rated volume, gal1×1.5×A. O. Smith CAHP-40 2A. O. Smith CAHP-50 2A. O. Smith CAHP-66 2A. O. Smith CAHP-80 2A. 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 HPS10-50H45DV 2A. O. Smith HPS10-66H45DV 2A. O. Smith HPS10-80H45DV 2A. O. Smith HPTU-66CTA 1A. O. Smith HPTV-50 2A. O. Smith HPTV-66 2A. O. Smith HPTV-80 2American 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 N51Friedrich 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 NWP500S080AUMBRheem 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 REHP80Vaughn 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 HPACO-45 1+AXST-50T 1A. O. Smith HPACO-45 1+AXST-50LBTTP 1Reclaim Energy MP120F-RCReclaim Energy MP80F-RCSanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBEco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1ASmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80SanCO2 GS5-45HPC HP + ECO-119GLBK
First-hour rating against rated volume, this group against the rest of the heat-pump list406080100120140306090120Rated volume, galA. O. Smith CAHP-40 2A. O. Smith CAHP-50 2A. O. Smith CAHP-66 2A. O. Smith CAHP-80 2A. 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 HPS10-50H45DV 2A. O. Smith HPS10-66H45DV 2A. O. Smith HPS10-80H45DV 2A. O. Smith HPTU-66CTA 1A. O. Smith HPTV-50 2A. O. Smith HPTV-66 2A. O. Smith HPTV-80 2American 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 N51Friedrich 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 NWP500S080AUMBRheem 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 REHP80Vaughn 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 HPACO-45 1+AXST-50T 1A. O. Smith HPACO-45 1+AXST-50LBTTP 1Reclaim Energy MP120F-RCReclaim Energy MP80F-RCSanCO2 GS5-45HPC HP + ECO-119GLBKSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBEco-Logical OMNI-50HP1-1AEco-Logical OMNI-50HP2-1AEco-Logical OMNI-80HP2-1ASmart Solar SSG2-ES 120Smart Solar SSG2-ES 65Smart Solar SSG2-ES 80SanCO2
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.

Every rating set

Grouped by the DOE draw pattern each UEF was tested at (why).

Heat-pump rating sets by draw pattern
Rating setRated volumeFirst-hour ratingUEFEnergyRefrigerantLow cut-off
High draw pattern8 of the 58 high-draw heat-pump sets
Eco-Logical OMNI-80HP2-1A
Show 1 model number
  • Eco-Logical OMNI-80HP2-1A
74 gal82 gal4.111,206 kWh/yrR-513A5 °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
Reclaim Energy MP80F-RCAlso listed as Vaughn Thermal
Show 2 model numbers
  • Reclaim Energy MP80F-RC
  • Vaughn Thermal MP80F-RC
80 gal98 gal3.801,273 kWh/yrR-744−13 °F
SanCO2 GS5-45HPC HP + ECO-83SSAQBLowest compressor cut-off of the 90 heat-pump sets that report one, tied with 1 other
Show 2 model numbers
  • SanCO2 GS5-45HPC HP + ECO-83SSAQB, GS5-45HPC-D HP + ECO-83SSAQB
83 gal121 gal3.801,313 kWh/yrR-744−26 °F
Reclaim Energy MP120F-RCAlso listed as Vaughn Thermal
Show 2 model numbers
  • Reclaim Energy MP120F-RC
  • Vaughn Thermal MP120F-RC
119 gal121 gal3.751,296 kWh/yrR-744−13 °F
SanCO2 GS5-45HPC HP + ECO-119GLBKLowest compressor cut-off of the 90 heat-pump sets that report one, tied with 1 other
Show 2 model numbers
  • SanCO2 GS5-45HPC HP + ECO-119GLBK, GS5-45HPC-D HP + ECO-119GLBK
119 gal134 gal3.721,333 kWh/yrR-744−26 °F
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
Smart Solar SSG2-ES 120
Show 1 model number
  • Smart Solar SSG2-ES 120
120 gal83 gal2.851,741 kWh/yrR-134a−20 °F
Medium draw pattern6 of the 38 medium-draw heat-pump sets
Eco-Logical OMNI-50HP2-1ALowest rated electricity use of the 38 medium-draw heat-pump sets
Show 1 model number
  • Eco-Logical OMNI-50HP2-1A
46 gal57 gal4.23769 kWh/yrR-513A5 °F
SanCO2 GS5-45HPC HP + ECO-43SSAQB
Show 2 model numbers
  • SanCO2 GS5-45HPC HP + ECO-43SSAQB, GS5-45HPC-D HP + ECO-43SSAQB
43 gal73 gal3.70868 kWh/yrR-744not listed
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
Smart Solar SSG2-ES 80
Show 1 model number
  • Smart Solar SSG2-ES 80
80 gal55 gal2.711,192 kWh/yrR-134a−20 °F
Low draw pattern2 of the 5 low-draw heat-pump sets
Eco-Logical OMNI-50HP1-1A
Show 1 model number
  • Eco-Logical OMNI-50HP1-1A
46 gal50 gal3.30681 kWh/yrR-513A5 °F
Smart Solar SSG2-ES 65
Show 1 model number
  • Smart Solar SSG2-ES 65
65 gal46 gal2.52893 kWh/yrR-134a−20 °F

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 16 sets here, 10 report a single value; the most common is 5 °F (3 sets) and the lowest −26 °F.

Lowest compressor operating temperature by rating setSplit system10 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-80HP2-1AOther heat pumps80 setsLG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802D31 sets3135 sets35Carnot Labs N51Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMBA. 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 1−30 °F−20 °F−10 °F0 °F10 °F20 °F30 °F40 °F50 °F
Lowest compressor operating temperatureSplit system10 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-80HP2-1AOther heat pumps80 setsLG APHWC501DLG APHWC502DLG APHWC801DLG APHWC802D31 sets3135 sets35Carnot Labs N51Navien NWP500S050AUMBNavien NWP500S065AUMBNavien NWP500S080AUMBA. 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 1−20 °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, 100 with a listed refrigerant.

Keep reading