waterheaterspecs

Heat pump · 240 V integrated

Ariston ARIHPWH-xx-T

The Ariston ARIHPWH-xx-T line holds four certified rating sets of 240 V integrated heat-pump water heaters, 8 model numbers sold under two brand names, listed by Ariston USA. Rated volume runs from 37 to 74 gal, and the first-hour rating runs from 65 to 88 gal. UEFs compare only within a draw pattern; the two high-draw sets rate UEF from 4.05 to 4.10. Ariston ARIHPWH-40-T lists 1.76 gal of first-hour output per rated gallon, the second highest of the 101 heat-pump sets. Ariston ARIHPWH-80-T, the set with the most model numbers, rates 0.22 above the median UEF of the 58 high-draw heat-pump sets (3.88).

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

Size by size

Certified values of Ariston ARIHPWH-xx-T
Rating setRated volume, galFirst hour, galPer rated galUEFUEF rankkWh/yr
Ariston ARIHPWH-40-T2 model numbers37651.763.55 medium17th lowest of 38, three tied915
Ariston ARIHPWH-50-T2 model numbers45691.533.83 mediumseventh highest of 38, two tied848
Ariston ARIHPWH-65-T2 model numbers61771.264.05 high14th highest of 58, three tied1,225
Ariston ARIHPWH-80-T2 model numbers74881.194.10 high11th highest of 58, two tied1,210

UEF ranks compare sets of the same draw pattern only.

Ariston ARIHPWH-xx-T: first-hour rating against rated volume

Ariston ARIHPWH-xx-TOther heat-pump sets

First-hour rating, gal

Ariston ARIHPWH-xx-T: 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-KA06-80Bradford 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 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 MP80FHPTAriston ARIHPWH-40-TAriston ARIHPWH-50-TAriston ARIHPWH-65-TAriston ARIHPWH-80-T
Ariston ARIHPWH-xx-T: 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-KA06-80Bradford 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 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 MP80FHPTAriston ARIHPWH-40-TAriston ARIHPWH-50-TAriston ARIHPWH-65-TAriston ARIHPWH-80-T
Filled: the four sets of Ariston ARIHPWH-xx-T; open circles: the other 97 heat-pump sets. Dashed lines mark 1× and 1.5× the rated volume; the highest ratio in the line is 1.76×, on Ariston ARIHPWH-40-T.

Across the sizes

From Ariston ARIHPWH-40-T to Ariston ARIHPWH-80-T, rated volume grows by 37 gal and the first-hour rating by 23 gal: 0.62 gal of first-hour output for each added rated gallon.

The sizes test at different draw patterns (two high and two 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 gallonAriston ARIHPWH-40-T1.761.25second highest of 101101 heat-pump sets
Rated volumeAriston ARIHPWH-40-T37 gal61 galsixth lowest of 101, two tied101 heat-pump sets
UEFAriston ARIHPWH-50-T3.833.56seventh highest of 38, two tied38 medium-draw heat-pump sets
Rated electricity useAriston ARIHPWH-50-T848 kWh/yr894 kWh/yrtenth lowest of 3838 medium-draw heat-pump sets
UEFAriston ARIHPWH-65-T4.053.8814th highest of 58, three tied58 high-draw heat-pump sets
Compressor cut-offAriston ARIHPWH-65-T35 °F36.3 °F15th lowest of 90, 29 tied90 heat-pump sets that report one
UEFAriston ARIHPWH-80-T4.103.8811th highest of 58, two tied58 high-draw heat-pump sets
Rated electricity useAriston ARIHPWH-80-T1,210 kWh/yr1,268 kWh/yr13th lowest of 58, two tied58 high-draw heat-pump sets

Model numbers

The line covers 8 model numbers under two brand names, first certified 2025-12-12 and most recently 2026-02-25. An asterisk stands for a variant character in the model number.

Model numberBrandRating setHeight × diameterElectricalRefrigerantConnectedCertified
ARIHPWH-40-TAristonARIHPWH-40-T37.8 × 18.2 in240 V / 21 AR-513Ayes2026-02-10
WHHP040T45MD240S****LennoxARIHPWH-40-T37.8 × 18.2 in240 V / 21 AR-513Ayes2026-02-25
ARIHPWH-50-TAristonARIHPWH-50-T45.8 × 18.2 in240 V / 21 AR-513Ayes2025-12-12
WHHP050T45MD240S****LennoxARIHPWH-50-T45.8 × 18.2 in240 V / 21 AR-513Ayes2026-02-25
ARIHPWH-65-TAristonARIHPWH-65-T50.5 × 20.2 in240 V / 21 AR-513Ayes2025-12-12
WHHP065T45MD240S****LennoxARIHPWH-65-T50.5 × 20.2 in240 V / 21 AR-513Ayes2026-02-25
ARIHPWH-80-TAristonARIHPWH-80-T59.8 × 20.2 in240 V / 21 AR-513Ayes2025-12-12
WHHP080T45MD240S****LennoxARIHPWH-80-T59.8 × 20.2 in240 V / 21 AR-513Ayes2026-02-25

Nearest certified alternatives

Rating setFirst hourUEFRated volume
American Standard ASHPWH-40compared with Ariston ARIHPWH-40-T+1 gal+0.03same gal
A. O. Smith HPACO-45 1+AXST-50T 1compared with Ariston ARIHPWH-40-T+2 gal−0.03+8 gal
Friedrich PROH50 T2 FD310BMcompared with Ariston ARIHPWH-40-T+2 gal−0.05+8 gal
A. O. Smith HP1050H45DV 1compared with Ariston ARIHPWH-40-T+1 gal−0.10+9 gal
Rheem PROPH50 T2 RH375-30compared with Ariston ARIHPWH-50-T−2 gal+0.05same gal

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