waterheaterspecs

Heat pump · split system

SanCO2 GS5-45HPC HP with ECO tanks

The SanCO2 GS5-45HPC HP with ECO tanks line holds three certified rating sets of split system heat-pump water heaters, 6 model numbers sold as SanCO2, listed by ECO2 Systems. Rated volume runs from 43 to 119 gal, and the first-hour rating runs from 73 to 134 gal. UEFs compare only within a draw pattern; the two high-draw sets rate UEF from 3.72 to 3.80. SanCO2 GS5-45HPC HP + ECO-119GLBK lists 134 gal in the first hour, the highest of the 101 heat-pump sets. SanCO2 GS5-45HPC HP + ECO-119GLBK lists a compressor cut-off of −26 °F, the lowest of the 90 heat-pump sets that report one (shared by two sets).

Certified as of October 27, 2026 · EPA ENERGY STAR data, public domain · Compare in the Heater finder

Size by size

Certified values of SanCO2 GS5-45HPC HP with ECO tanks
Rating setRated volume, galFirst hour, galPer rated galUEFUEF rankkWh/yr
SanCO2 GS5-45HPC HP + ECO-43SSAQB2 model numbers43731.703.70 medium15th highest of 38, two tied868
SanCO2 GS5-45HPC HP + ECO-83SSAQB2 model numbers831211.463.80 high24th lowest of 58, three tied1,313
SanCO2 GS5-45HPC HP + ECO-119GLBK2 model numbers1191341.133.72 high22nd lowest of 581,333

UEF ranks compare sets of the same draw pattern only.

SanCO2 GS5-45HPC HP with ECO tanks: first-hour rating against rated volume

SanCO2 GS5-45HPC HP with ECO tanksOther heat-pump sets

First-hour rating, gal

SanCO2 GS5-45HPC HP with ECO tanks: first-hour rating against rated volume40608010012014030405060708090100110120Rated 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 HPACO-45 1+AXST-50LBTTP 1A. O. Smith HPACO-45 1+AXST-50T 1A. O. Smith HPACO-45 1+AXST-66 1A. O. Smith HPACO-45 1+AXST-80 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 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 PH80S10BPY01Giant GTHPCO-45 1+GTXST-50S 1Gree 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 REHP80Smart 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 MP80FHPTSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBSanCO2 GS5-45HPC HP + ECO-119GLBK
SanCO2 GS5-45HPC HP with ECO tanks: first-hour rating against rated volume406080100120140306090120Rated 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 HPACO-45 1+AXST-50LBTTP 1A. O. Smith HPACO-45 1+AXST-50T 1A. O. Smith HPACO-45 1+AXST-66 1A. O. Smith HPACO-45 1+AXST-80 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 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 PH80S10BPY01Giant GTHPCO-45 1+GTXST-50S 1Gree 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 REHP80Smart 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 MP80FHPTSanCO2 GS5-45HPC HP + ECO-43SSAQBSanCO2 GS5-45HPC HP + ECO-83SSAQBSanCO2 GS5-45HPC HP + ECO-119GLBK
Filled: the three sets of SanCO2 GS5-45HPC HP with ECO tanks; open circles: the other 98 heat-pump sets. Dashed lines mark 1× and 1.5× the rated volume; the highest ratio in the line is 1.70×, on SanCO2 GS5-45HPC HP + ECO-43SSAQB.

Across the sizes

From SanCO2 GS5-45HPC HP + ECO-43SSAQB to SanCO2 GS5-45HPC HP + ECO-119GLBK, rated volume grows by 76 gal and the first-hour rating by 61 gal: 0.80 gal of first-hour output for each added rated gallon.

The sizes test at different draw patterns (two high and one medium), so UEF and annual energy compare only between sizes that share a pattern (why).

Strongest placings, size by size

MeasureValueMedian of the groupPlacingCompared with
First-hour output per rated gallonSanCO2 GS5-45HPC HP + ECO-43SSAQB1.701.25third highest of 101101 heat-pump sets
Rated volumeSanCO2 GS5-45HPC HP + ECO-43SSAQB43 gal61 galtenth lowest of 101101 heat-pump sets
Compressor cut-offSanCO2 GS5-45HPC HP + ECO-83SSAQB−26 °F36.3 °Flowest of 90, two tied90 heat-pump sets that report one
First-hour ratingSanCO2 GS5-45HPC HP + ECO-83SSAQB121 gal77 galsecond highest of 101, two tied101 heat-pump sets
Compressor cut-offSanCO2 GS5-45HPC HP + ECO-119GLBK−26 °F36.3 °Flowest of 90, two tied90 heat-pump sets that report one
First-hour ratingSanCO2 GS5-45HPC HP + ECO-119GLBK134 gal77 galhighest of 101101 heat-pump sets

Model numbers

The line covers 6 model numbers, first certified 2014-08-21 and most recently 2024-10-09.

Model numberBrandRating setHeight × diameterElectricalRefrigerantConnectedCertified
GS5-45HPC HP + ECO-43SSAQBSanCO2GS5-45HPC HP + ECO-43SSAQBnot listed230 V / 7 AR-744no2024-10-09
GS5-45HPC-D HP + ECO-43SSAQBSanCO2GS5-45HPC HP + ECO-43SSAQBnot listed230 V / 7 AR-744no2024-10-09
GS5-45HPC HP + ECO-83SSAQBSanCO2GS5-45HPC HP + ECO-83SSAQBnot listed230 V / 7 AR-744no2024-08-21
GS5-45HPC-D HP + ECO-83SSAQBSanCO2GS5-45HPC HP + ECO-83SSAQBnot listed230 V / 7 AR-744no2024-08-21
GS5-45HPC HP + ECO-119GLBKSanCO2GS5-45HPC HP + ECO-119GLBKnot listed230 V / 7 AR-744no2024-08-21
GS5-45HPC-D HP + ECO-119GLBKSanCO2GS5-45HPC HP + ECO-119GLBKnot listed230 V / 7 AR-744no2014-08-21

Nearest certified alternatives

Rating setFirst hourUEFRated volume
Rinnai REHP50compared with SanCO2 GS5-45HPC HP + ECO-43SSAQBsame gal+0.05+3 gal
Midea CAN3-RSJ-15/190RDVN3-L4compared with SanCO2 GS5-45HPC HP + ECO-43SSAQB−2 gal+0.05+3 gal
Midea CAN3-RSJ-15/190RDVN3-L3compared with SanCO2 GS5-45HPC HP + ECO-43SSAQB−4 gal+0.05+4 gal
American Standard ASHPWH-50compared with SanCO2 GS5-45HPC HP + ECO-43SSAQB−5 gal+0.05+2 gal
Reclaim Energy MP120F-RCcompared with SanCO2 GS5-45HPC HP + ECO-83SSAQBsame gal−0.05+36 gal

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