Home Water Heaters 40-Gallon Water Heaters 40-Gallon Water Heaters ENERGY STAR certified tank water heaters in the nominal 40-gallon class. Tank size alone doesn't determine capacity — the first-hour rating (how much hot water the unit delivers in its first hour from full) is the number to size by.
159 certified models in this category.
Model Uniform Energy Factor (UEF) Fuel First-hour rating Max flow rate Rated storage volume Smart / connected capable A. O. Smith GC6-PS4050-V 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No A. O. Smith GPCC-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No A. O. Smith GPCT-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No A. O. Smith GPCT-40L 1 40-Gallon (GC9-PS4050NV 1) 0.9 Natural Gas 86 gal — 38 gal No A. O. Smith GPCT-40L 1 40-Gallon (HPCT-40L 1) 0.9 Natural Gas, Propane 86 gal — 38 gal No A. O. Smith Heat Pump 40-Gallon (HPA10-40H45DV 2) 3.6 Electric 55 gal — 36 gal Yes A. O. Smith Heat Pump 40-Gallon (HPTA-40 2) 3.6 Electric 55 gal — 36 gal Yes A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45 1-+AXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45 1-+AXST-50TTTP 1) 3.52 Electric 67 gal — 45 gal Yes A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45C 1-+AXST-50TC 1) 3.52 Electric 67 gal — 45 gal Yes A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45C 1-+AXST-50TCTTP 1) 3.52 Electric 67 gal — 45 gal Yes American GPCT-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No American Heat Pump 40-Gallon 3.6 Electric 55 gal — 36 gal Yes American PCG62-40S50L 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No American Split System Heat Pump 40-Gallon (MHPCO-45 1-+MXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes American Split System Heat Pump 40-Gallon (MHPCO-45 1-+MXST-50TTTP 1) 3.52 Electric 67 gal — 45 gal Yes AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-40) 3.58 Electric 66 gal — 37 gal Yes AMERICAN STANDARD WATER HEATERS Heat Pump Water Heater 40-Gallon (ASHPWH-50) 3.75 Electric 68 gal — 45 gal Yes Arctic-HP-Hot Water-KA06-50 40-Gallon 3.88 Electric 65 gal — 44.5 gal No Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40-T) 3.55 Electric 65 gal — 37 gal Yes Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-40) 3.58 Electric 66 gal — 37 gal Yes Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-50-T) 3.83 Electric 69 gal — 45 gal Yes Ariston Heat Pump Water Heater 40-Gallon (ARIHPWH-50) 3.75 Electric 68 gal — 45 gal Yes Bradford White RE2H50S 40-Gallon 3.44 Electric 65 gal — 45 gal No Bradford White RE2HP50-1NCTT 40-Gallon 3.89 Electric 65 gal — 45 gal No Envirosense Enercare ENV-40N-ENER 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No Envirosense ENV-40N 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No Envirosense Reliance Home Comfort ENV-40N-RHC 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No Friedrich 12PROG 40-50P FD HE EC3 40-Gallon 0.9 Propane 88 gal — 40 gal No Friedrich 12PROG 40-50U FD HE EC3 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Friedrich 8PROG 40-50P FD HE EC1 40-Gallon 0.9 Propane 88 gal — 40 gal No Friedrich 8PROG 40-50U FD HE EC1 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Friedrich Heat Pump 40-Gallon (PROH40 T0 FD120-M) 2.8 Electric 45 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T0 FD120-MSO) 2.8 Electric 45 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD310BM) 3.5 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD310UM) 3.5 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD350BM) 3.5 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD350UM) 3.5 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD400-15) 3.45 Electric 46 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD400-30) 3.83 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH40 T2 FD400-SO) 3.83 Electric 60 gal — 36 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD310BM) 3.5 Electric 67 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD310UM) 3.5 Electric 67 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD350BM) 3.5 Electric 67 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD350UM) 3.5 Electric 67 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD400-15) 3.75 Electric 52 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD400-30) 3.88 Electric 67 gal — 45 gal No Friedrich Heat Pump 40-Gallon (PROH50 T2 FD400-SO) 3.88 Electric 67 gal — 45 gal No GE Profile Heat Pump 40-Gallon (PF40S10FPY01) 3.1 Electric 46 gal — 40 gal Yes GE Profile Heat Pump 40-Gallon (PH40S10BPY01) 4.2 Electric 64 gal — 40 gal Yes JETGLAS RE2H50S 40-Gallon 3.44 Electric 65 gal — 45 gal No JETGLAS RE2HP50-1NCTT 40-Gallon 3.89 Electric 65 gal — 45 gal No John Wood Split System Heat Pump 40-Gallon (JWHPCO-45 1-+JWXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes John Wood Split System Heat Pump 40-Gallon (JWHPCO-45 1-+JWXST-50TTTP 1) 3.52 Electric 67 gal — 45 gal Yes Lennox Heat Pump Water Heater 40-Gallon (WHHP040T45MD240S) 3.55 Electric 65 gal — 37 gal Yes Lennox Heat Pump Water Heater 40-Gallon (WHHP050T45MD240S) 3.83 Electric 69 gal — 45 gal Yes Lochinvar Heat Pump 40-Gallon 3.6 Electric 55 gal — 36 gal Yes Lochinvar LHPCT-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No Lochinvar Split System Heat Pump 40-Gallon (LHPCO-45 1-+LXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes Lochinvar Split System Heat Pump 40-Gallon (LHPCO-45 1-+LXST-50TTTP 1) 3.52 Electric 67 gal — 45 gal Yes Navien NWP500 40-Gallon 3.85 Electric 65 gal — 44 gal No PHNIX KA06-50 40-Gallon 3.88 Electric 65 gal — 44.5 gal No RELIANCE WATER HEATERS 6-40-RPCS 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No RELIANCE WATER HEATERS GPCT-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No RELIANCE WATER HEATERS Heat Pump 40-Gallon 3.6 Electric 55 gal — 36 gal Yes RELIANCE WATER HEATERS Split System Heat Pump 40-Gallon (RHPCO-45 1-+RXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes RELIANCE WATER HEATERS Split System Heat Pump 40-Gallon (RHPCO-45 1-+RXST-50TG 1) 3.52 Electric 67 gal — 45 gal Yes Rheem ECE G40-50U CN HE 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) 3.5 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310UM) 3.5 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310BM) 3.5 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) 3.5 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROPH40 T0 RH120-M) 2.8 Electric 45 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T0 RH120-MSO) 2.8 Electric 45 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-15) 3.45 Electric 46 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-SO) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH400-15) 3.45 Electric 46 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH400-30) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH40 T2 RH400-SO) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROPH50 T2 RH375-15) 3.75 Electric 52 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROPH50 T2 RH375-30) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROPH50 T2 RH400-15) 3.75 Electric 52 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROPH50 T2 RH400-30) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROPH50 T2 RH400-SO) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROUH40 T2 RH350BM) 3.5 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROUH40 T2 RH350UM) 3.5 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (PROUH50 T2 RH350BM) 3.5 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (PROUH50 T2 RH350UM) 3.5 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE40T10H22U0) 3.45 Electric 46 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10H22U1) 3.45 Electric 46 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10H45U0) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10H45U1) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10HM00U0) 2.8 Electric 45 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10HMS00U0) 2.8 Electric 45 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10HS45U0) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE40T10HS45U1) 3.83 Electric 60 gal — 36 gal No Rheem Heat Pump 40-Gallon (XE50T10H22U0) 3.75 Electric 52 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE50T10H22U1) 3.75 Electric 52 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE50T10H45U0) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE50T10H45U1) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE50T10HS45U0) 3.88 Electric 67 gal — 45 gal No Rheem Heat Pump 40-Gallon (XE50T10HS45U1) 3.88 Electric 67 gal — 45 gal No Rheem PRO+G40-50P RH HE EC1 40-Gallon 0.9 Propane 88 gal — 40 gal No Rheem PRO+G40-50U RH HE EC1 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Rheem PROP G40-50-CN HE 40-Gallon 0.9 Natural Gas, Propane 88 gal — 40 gal No Rheem PROP G40-50-RH HE EC3 40-Gallon 0.9 Natural Gas, Propane 88 gal — 40 gal No Rheem XG40S12UHN50 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Rheem XG40T09UHN50U0 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Rheem XP40S12UHC50 40-Gallon 0.9 Propane 88 gal — 40 gal No Rheem XP40T09UHC50U0 40-Gallon 0.9 Propane 88 gal — 40 gal No Richmond 12GUH40-50F 40-Gallon 0.9 Natural Gas, Propane 88 gal — 40 gal No Richmond 9GUH40-50FN 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Richmond 9GUH40-50FP 40-Gallon 0.9 Propane 88 gal — 40 gal No Richmond Heat Pump 40-Gallon (10E40-HP120M) 2.8 Electric 45 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP120MS) 2.8 Electric 45 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP515) 3.45 Electric 46 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP530) 3.83 Electric 60 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP5S30) 3.83 Electric 60 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP5U15) 3.45 Electric 46 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP5U30) 3.83 Electric 60 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E40-HP5US30) 3.83 Electric 60 gal — 36 gal No Richmond Heat Pump 40-Gallon (10E50-HP515) 3.75 Electric 52 gal — 45 gal No Richmond Heat Pump 40-Gallon (10E50-HP530) 3.88 Electric 67 gal — 45 gal No Richmond Heat Pump 40-Gallon (10E50-HP5U15) 3.75 Electric 52 gal — 45 gal No Richmond Heat Pump 40-Gallon (10E50-HP5U30) 3.88 Electric 67 gal — 45 gal No Richmond Heat Pump 40-Gallon (10E50-HP5US30) 3.88 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310BM) 3.5 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) 3.5 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PRO H50 T2 RU310BM) 3.5 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PRO H50 T2 RU310UM) 3.5 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-M) 2.8 Electric 45 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T0 RU120-MSO) 2.8 Electric 45 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU350BM) 3.5 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU350UM) 3.5 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU375-15) 3.45 Electric 46 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU375-30) 3.83 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU375-SO) 3.83 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU400-15) 3.45 Electric 46 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU400-30) 3.83 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH40 T2 RU400-SO) 3.83 Electric 60 gal — 36 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU350BM) 3.5 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU350UM) 3.5 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU375-15) 3.75 Electric 52 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU375-30) 3.88 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU375-SO) 3.88 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU400-15) 3.75 Electric 52 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU400-30) 3.88 Electric 67 gal — 45 gal No Ruud Heat Pump 40-Gallon (PROUH50 T2 RU400-SO) 3.88 Electric 67 gal — 45 gal No Ruud PRO+G40-50P RU HE EC1 40-Gallon 0.9 Propane 88 gal — 40 gal No Ruud PRO+G40-50U RU HE EC1 40-Gallon 0.9 Natural Gas 88 gal — 40 gal No Ruud PROU G40-50-RU HE EC3 40-Gallon 0.9 Natural Gas, Propane 88 gal — 40 gal No SANCO2 40-Gallon (GS5-45HPC HP + ECO-43SSAQB) 3.7 Electric 73 gal — 43 gal No SANCO2 40-Gallon (GS5-45HPC-D HP + ECO-43SSAQB) 3.7 Electric 73 gal — 43 gal No State GP6-40-RPCS 1 40-Gallon 0.9 Natural Gas 86 gal — 38 gal No State GPCT-40L 1 40-Gallon 0.9 Natural Gas, Propane 86 gal — 38 gal No State Heat Pump 40-Gallon 3.6 Electric 55 gal — 36 gal Yes State Split System Heat Pump 40-Gallon (SHPCO-45 1-+SXST-50T 1) 3.52 Electric 67 gal — 45 gal Yes State Split System Heat Pump 40-Gallon (SHPCO-45 1-+SXST-50TG 1) 3.52 Electric 67 gal — 45 gal Yes
