A. O. Smith water heaters
186 basic models and 639 listed models.
Certified figures by basic model
| Basic model | Type | Storage volume (gal) | UEF | Flow at a 67°F rise (gal/min) | First-hour rating (gal) | Recovery efficiency | Model numbers |
|---|---|---|---|---|---|---|---|
| ACTH-199M-(N,P) 1** | Gas tankless | — | 0.95 | 5.8 | — | 97% | ACTH-199M-(N,P) 1** |
| ATHR-160M 1** | Gas tankless | — | 0.95 | 4.8 | — | 98% | ATHR-160M 1**, ATHR-160X3 1**, GT15THR-160M 1**, GT15THR-160X3 1** |
| ATHR-180M 1** | Gas tankless | — | 0.95 | 5.3 | — | 97% | ATHR-180M 1**, ATHR-180X3 1**, GT15THR-180M 1**, GT15THR-180X3 1** |
| ATHR-199M 1** | Gas tankless | — | 0.95 | 5.9 | — | 98% | ATHR-199M 1**, ATHR-199X3 1**, GT15THR-199M 1**, GT15THR-199X3 1** |
| ATI-140B-N 1** | Gas tankless | — | 0.81 | 3.6 | — | 84% | ATI-140B-N 1**, ATI-140X3-N 1**, GT12I-140B-N |
| ATI-180B-N 1** | Gas tankless | — | 0.82 | 4.7 | — | 84% | ATI-180B-N 1**, ATI-180X3-N 1**, GT12I-180B-N 1**, GT15I-180X3-N 1** |
| ATI-199B-N 1** | Gas tankless | — | 0.82 | 5.2 | — | 85% | ATI-199B-N 1**, ATI-199X3-N 1**, GT12I-199B-N 1** |
| ATM-140M-N 1** | Gas tankless | — | 0.95 | 4.1 | — | 97% | ATM-140M-N 1**, ATM-140X3-N 1**, GT15TM-140M-N 1** |
| ATM-160M-N 1** | Gas tankless | — | 0.95 | 4.8 | — | 96% | ATM-160M-N 1**, ATM-160M-P 1*1, ATM-160X3-N 1**, ATM-160X3-P 1*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 |
| ATM-180M-N 1** | Gas tankless | — | 0.95 | 5.4 | — | 96% | ATM-180M-N 1**, ATM-180M-P 1*1, ATM-180X3-N 1**, ATM-180X3-P 1*1, GT15TM-180M-N, GT15TM-180M-N 1**, GT15TM-180M-P 1*1, GT15TM-180X3-N, GT15TM-180X3-N 1** |
| ATM-199M-N 1** | Gas tankless | — | 0.95 | 6.0 | — | 96% | ATM-199M-N 1**, ATM-199M-P 1*1, ATM-199X3-N 1**, ATM-199X3-P 1*1, GT15TM-199M-N, GT15TM-199M-N 1**, GT15TM-199M-P 1*1, GT15TM-199X3-N, GT15TM-199X3-N 1**, GT15TM-199X3-P 1*1, UTM-199X3-N 1** |
| ATO-140B-N 1** | Gas tankless | — | 0.81 | 3.6 | — | 84% | ATO-140B-N 1**, GT12E-140B-N |
| ATO-140X3-N 1** | Gas tankless | — | 0.81 | 3.6 | — | 84% | ATO-140X3-N 1** |
| ATO-180B-N 1** | Gas tankless | — | 0.82 | 4.7 | — | 86% | ATO-180B-N 1**, ATO-180X3-N 1**, GT12E-180B-N 1**, GT15E-180X3-N 1** |
| ATO-199B-N 1** | Gas tankless | — | 0.82 | 5.0 | — | 86% | ATO-199B-N 1**, ATO-199X3-N 1**, GT12E-199B-N 1** |
| C2VA-120E 1** | Electric tankless | — | 0.84 | 1.2 | — | 86% | C2VA-120E 1** |
| E62-38T-045DV 1** | Tabletop | 35 | 0.90 | — | 55 | 98% | E6-38TT45DV 1**, ENTT-38 1** |
| EELBU-50 1** | Electric storage | 44 | 0.92 | — | 55 | 98% | EELBU-50 1**, EEU6-50L45DVB 1**, PELBU-50 1** |
| EETU-55W 1** | Electric storage | 55 | 0.92 | — | 64 | 98% | EETU-55W 1** |
| ENJ-30 1** | Electric storage | 26 | 0.91 | — | 43 | 98% | E6-30J45DV 1**, ENJ-30 1** |
| ENJ-40 1** | Electric storage | 35 | 0.93 | — | 54 | 98% | E6-40J45DV 1**, ENJ-40 1** |
| ENJ-40W 1** | Electric storage | 35 | 0.91 | — | 38 | 98% | ENJ-40W 1** |
| ENJB-30 1** | Electric storage | 26 | 0.90 | — | 47 | 98% | E6-30J45DVB 1**, EMHL-30 1**, ENJB-30 1**, MHE6-30L 030D 1**, MHE6-30L-030S 1** |
| ENJB-40 1** | Electric storage | 35 | 0.94 | — | 57 | 98% | E6-40J45DVB 1**, ENJB-40 1** |
| ENJB-40W 1** | Electric storage | 35 | 0.91 | — | 38 | 98% | ENJB-40W 1** |
| ENL-30 1** | Electric storage | 26 | 0.90 | — | 44 | 98% | E6-30L45D 1**, ENL-30 1**, PNL-30 1** |
| ENL-36 2** | Electric storage | 33 | 0.92 | — | 51 | 98% | DEL-30 2**, E6-36L45DV 2**, ENL-36 2**, PNL-36 2** |
| ENL-40 1** | Electric storage | 35 | 0.89 | — | 50 | 98% | ENL-40 1** |
| ENL-50 1** | Electric storage | 48 | 0.92 | — | 51 | 98% | DEL-50 1**, ENL-50 1**, PNL-50 1** |
| ENLB-30 1** | Electric storage | 26 | 0.89 | — | 43 | 98% | E6-30L38DB 1**, E6-30L45DB 1**, E6-30L45DVB 1**, ENLB-30 1**, PNLB-30 1** |
| ENLB-40 1** | Electric storage | 35 | 0.92 | — | 51 | 98% | DEL-40 1**, E6-40L45DB 1**, E6-40L45DVB 1**, ENLB-40 1**, PNLB-40 1** |
| ENLB-40W 1** | Electric storage | 35 | 0.90 | — | 38 | 98% | E6-40L38DB 1**, ENLB-40W 1** |
| ENLB-50 1** | Electric storage | 44 | 0.93 | — | 60 | 98% | E6-50L45DVB 1**, ENLB-50 1**, PNLB-50 1** |
| ENLB-50W 1** | Electric storage | 44 | 0.91 | — | 40 | 98% | ENLB-50W 1**, PNLB-50W 1** |
| ENS-30 1** | Electric storage | 27 | 0.89 | — | 47 | 98% | E6-30R45DV 1**, ENS-30 1**, PNS-30 1** |
| ENS-40 1** | Electric storage | 37 | 0.92 | — | 55 | 98% | DEN-30 1**, E6-40R38D 1**, E6-40R45D 1**, E6-40R45DV 1**, ENS-40 1**, HNS-40 1**, PNS-40 1** |
| ENS-40W 1** | Electric storage | 37 | 0.88 | — | 41 | 98% | E6-40R38D 1**, ENS-40W 1** |
| ENS-50 1** | Electric storage | 46 | 0.92 | — | 57 | 98% | E6-50R38D 1**, E6-50R45D 1**, E6-50R45DV 1**, ENS-50 1**, HNS-50 1**, PNS-50 1** |
| ENSB-30 1** | Electric storage | 27 | 0.91 | — | 50 | 98% | E6-30R45DVB 1**, ENSB-30 1**, PNSB-30 1** |
| ENT-40 1** | Electric storage | 36 | 0.92 | — | 53 | 98% | E6-40H38D 1**, E6-40H45D 1**, E6-40H45DV 1**, ENT-40 1**, HNT-40 1**, PNT-40 1** |
| ENT-50-1** | Electric storage | 46 | 0.92 | — | 62 | 98% | DEN-40 1**, E6-50H38D 1**, E6-50H45D 1**, E6-50H45DV 1**, ENT-50-1**, HNT-50 1**, PNT-50 1** |
| ENT-55 1** | Electric storage | 55 | 0.93 | — | 72 | 98% | DEN-52 1**, E6-55H45DV 1**, E9-55H55DV 1**, ENT-55 1**, HNT-55 1**, PNT-55 1** |
| FMDV-30 2** | Gas storage | 29 | 0.61 | — | 60 | 78% | FMDV-30 2**, G6-DMH3030NV 2** |
| FMDV-40 2** | Gas storage | 38 | 0.59 | — | 57 | 76% | FMDV-40 2**, G6-DMH4032NV 2** |
| FMDV-50 2** | Gas storage | 47 | 0.57 | — | 67 | 77% | FMDV-50 2** |
| FMHR-30 4** | Gas storage | 29 | 0.60 | — | 63 | 79% | FMHR-30 4**, G6-MH3035NVR 4** |
| FMHR-40 4** | Gas storage | 38 | 0.58 | — | 59 | 78% | FMHR-40 4**, G6-MH4035NVR 4** |
| FPTU-50 1** | Heat pump | 46 | 3.35 | — | 66 | 407% | FPTU-50 1** |
| FPTU-66 1** | Heat pump | 67 | 3.42 | — | 79 | 265% | FPTU-66 1** |
| FPTU-80 1** | Heat pump | 82 | 3.45 | — | 84 | 233% | FPTU-80 1** |
| G6-US4040NV 5** | Gas storage | 38 | 0.64 | — | 83 | 75% | G6-US4040NV 5**, GURL-40 5** |
| G6-UT3030NVR 5** | Gas storage | 29 | 0.60 | — | 67 | 76% | G6-UT3030NVR 5**, GUC-30 5** |
| G6N-UT4040NVR 5** | Gas storage | 38 | 0.64 | — | 83 | 74% | G6-UT4040NL 5**, G6N-UT4040NVR 5**, GUC-40 5** |
| G6N-UT5040NVR 5** | Gas storage | 48 | 0.63 | — | 76 | 77% | G6N-UT5040NVR 5**, GUC-50 5**, XUC-50 5** |
| G9-UT4040NVR 5** | Gas storage | 38 | 0.64 | — | 83 | 77% | G12-UT4040NVR 5**, G9-UT4040NVR 5**, GUR-40 5**, HUR-40 5** |
| G9-UT5040NVR 5** | Gas storage | 48 | 0.64 | — | 78 | 77% | G12-UT5040NVR 5**, G9-UT5040NVR 5**, GUR-50 5**, HUR-50 5** |
| GC6-PS4050*V 1** | Gas storage | 38 | 0.90 | — | 86 | 91% | GC6-PS4050*V 1** |
| GC6-PS5065*V 1** | Gas storage | 49 | 0.90 | — | 118 | 92% | GC6-PS5065*V 1** |
| GCB-30R 4** | Gas storage | 29 | 0.60 | — | 62 | 74% | G6-T3032NVRB 4**, GCB-30R 4**, GCB-30R 4*1 |
| GCB-40 4** | Gas storage | 38 | 0.64 | — | 78 | 77% | G6-T4040NVRB 4**, GCB-40 4**, GCB-40 4*1, XCB-40 4** |
| GCBL-30R 4** | Gas storage | 29 | 0.60 | — | 65 | 75% | GCBL-30R 4**, GCBL-30R 4*1 |
| GCBL-40 4** | Gas storage | 38 | 0.57 | — | 68 | 75% | G6-S4040NVRB 4**, GCBL-40 4**, GCBL-40 401, XCBL-40 4**, XCBL-40 4*1 |
| GCF-40 1** | Gas storage | 38 | 0.64 | — | 70 | 73% | G12-FDT4040NVR 1**, GCF-40 1**, GCF-40 1*1 |
| GCF-50 1** | Gas storage | 48 | 0.69 | — | 84 | 80% | G12-FDT5040NVR 1**, GCF-50 1**, GCF-50 1*1 |
| GCFL-40 1** | Gas storage | 38 | 0.66 | — | 65 | 77% | GCFL-40 1**, GCFL-40 1*1 |
| GCFL-50 1** | Gas storage | 49 | 0.69 | — | 78 | 79% | GCFL-50 1** |
| GCG-50 4** | Gas storage | 48 | 0.62 | — | 81 | 79% | G6N-T5040NVR 4**, G6N-T5040PVR 4*1, GCG-50 4**, GCG-50 4*1, GCG-50L 4**, GCG-50L 4*1, HWG-50 4**, HWG-50 4*1, XCG-50 4**, XCG-50 4*1 |
| GCGH-50 2** | Gas storage | 48 | 0.63 | — | 76 | 77% | GCGH-50 2**, GCGH-50 2*1 |
| GCR-30 2** | Gas storage | 29 | 0.63 | — | 63 | 77% | GCR-30 2**, GCR-30 2*1 |
| GCR-30R 2** | Gas storage | 29 | 0.61 | — | 52 | 74% | GCR-30R 2**, GCR-30R 2*1 |
| GCR-30R 4** | Gas storage | 29 | 0.60 | — | 62 | 73% | G6-T3032NVR 4**, G6-T3032PVR 4*1, GCR-30R 4**, GCR-30R 4*1, XCR-30R 4** |
| GCR-40 2** | Gas storage | 38 | 0.64 | — | 80 | 74% | GCR-40 2**, GCR-40 2*1 |
| GCR-40 410 | Gas storage | 38 | 0.64 | — | 80 | 78% | G12-T4040NVR 410, G6-T4036PVR 411, G6-T4040NVR 410, G9-T4040NVR 410, GCR-40 410, GCR-40 411, GCR-40L 410, GCR-40L 411, HWR-40 410, HWR-40 411, XCR-40 410, XCR-40 411, XCR-40L 410 |
| GCR-50 2** | Gas storage | 48 | 0.64 | — | 81 | 80% | GCR-50 2**, GCR-50 2*1 |
| GCR-50 4** | Gas storage | 48 | 0.62 | — | 84 | 77% | G12-T5040NVR 4**, G6-T5040NVR 4**, G9-T5040NVR 4**, GCR-50 4**, GCR-50 4*1, GCR-50L 4**, GCR-50L 4*1, HWR-50 4**, HWR-50 4*1, XCR-50 4**, XCR-50 4*1, XCR-50L 4**, XCR-50L 4*1 |
| GCRH-40 4** | Gas storage | 38 | 0.59 | — | 65 | 80% | G6-T4035NVR 4**, GCRH-40 4**, XCRH-40 4** |
| GCRL-30R 4** | Gas storage | 29 | 0.60 | — | 55 | 75% | G6-S3032NVR 4**, G6-S3032PVR 4*1, GCRL-30R 4**, GCRL-30R 4*1, XCRL-30R 4** |
| GCRL-40 2** | Gas storage | 38 | 0.58 | — | 64 | 74% | GCRL-40 2**, GCRL-40 2*1 |
| GCRL-40 4** | Gas storage | 38 | 0.58 | — | 67 | 78% | G12-S4040NVR 4**, G6-S4040NVR 4**, G6-S4040PVR 4*1, G9-S4040NVR 4**, GCRL-40 4**, GCRL-40 4*1, HWRL-40 4**, HWRL-40 4*1, XCRL-40 4**, XCRL-40 4*1 |
| GCRL-50 2** | Gas storage | 49 | 0.62 | — | 78 | 73% | GCRL-50 2**, GCRL-50 2*1 |
| GCRL-50 4** | Gas storage | 50 | 0.62 | — | 81 | 77% | G6-S5040NV 4**, GCRL-50 4**, GCRL-50 4*1, HWRL-50 4**, HWRL-50 4*1, XCRL-50 4**, XCRL-50 4*1 |
| GCRT-50 4** | Gas storage | 48 | 0.61 | — | 89 | 77% | G6-T5050NV 4**, GCRT-50 4**, GCRT-50 4*1, GCRT-50L 4**, GCRT-50L 4*1, HWRT-50 4**, HWRT-50 4*1, HWRT-50L 4**, HWRT-50L 4*1, XCRT 50 4*1, XCRT-50 4**, XCRT-50L 4**, XCRT-50L 4*1 |
| GCRX-50 2** | Gas storage | 49 | 0.61 | — | 99 | 75% | GCRX-50 2**, GCRX-50 2*1, GCRX-50L 2**, GCRX-50L 2*1, XCRX-50 2**, XCRX-50 2*1, XCRX-50L 2**, XCRX-50L 2*1 |
| GCRX-55 2** | Gas storage | 55 | 0.62 | — | 83 | 74% | BT-60 2**, BT-60 2*1, GCRX-55 2**, GCRX-55 2*1, GCRX-55L 2**, GCRX-55L 2*1, HWRX-55 2**, HWRX-55 2*1, HWRX-55L 2**, HWRX-55L 2*1, XCRX-55 2**, XCRX-55 2*1, XCRX-55L 2** |
| GDHE-75 3** | Gas storage | 74 | 0.86 | — | 130 | 96% | GDHE-75 3** |
| GDV-40 3** | Gas storage | 39 | 0.60 | — | 64 | 75% | G6-DVS4038NV 3**, G6-DVS4038NVL 3**, GDV-40 3**, GDV-40 3*1, GDV-40L 3**, GDV-40L 3*1 |
| GDV-50 3** | Gas storage | 48 | 0.66 | — | 77 | 79% | G6-DVT5040NV 3**, G6-DVT5040NVL 3**, GDV-50 3**, GDV-50 3*1, GDV-50L 3**, GDV-50L 3*1 |
| GDVNL-40L 1** | Gas storage | 38 | 0.61 | — | 64 | 74% | G6-UDS4036NV 1**, GDVNL-40L 1** |
| GDVNT-50L 1** | Gas storage | 48 | 0.65 | — | 84 | 81% | G6-UDT5038NV 1**, GDVNT-50L 1** |
| GDVT-50 3** | Gas storage | 48 | 0.65 | — | 82 | 79% | GDVT-50 3**, GDVT-50 3*1, GDVT-50L 3**, GDVT-50L 3*1 |
| GPCT-40L 1** | Gas storage | 38 | 0.90 | — | 86 | 91% | GC9-PS4050NV 1**, GPCC-40L 1**, GPCT-40L 1**, HPCT-40L 1** |
| GPCX-50L 1** | Gas storage | 49 | 0.90 | — | 118 | 92% | GC9-PS5065NV 1**, GPCC-50X 1**, GPCX-50L 1**, HPCX-50L 1** |
| GPDL-40 3** | Gas storage | 38 | 0.68 | — | 74 | 79% | G6-PDS4040NV 3**, GPDL-40 3**, GPDL-40 3*1, GPDL-40L 3**, GPDL-40L 3*1 |
| GPDNL-40 1** | Gas storage | 38 | 0.70 | — | 75 | 77% | G6-UPDS4040NV 1**, GPDNL-40 1**, UPDN04040Z 1** |
| GPDNT-50 1** | Gas storage | 48 | 0.70 | — | 75 | 79% | G6-UPDT5040NL 1**, G6-UPDT5040NV 1**, GPDNT-50 1**, UPDN05040 1**, UPDVG62-50T40 1** |
| GPDT-50 3** | Gas storage | 48 | 0.72 | — | 79 | 79% | G6-PDT5045NV 3**, GPDT-50 3**, GPDT-50 3*1, GPDT-50L 3**, GPDT-50L 3*1 |
| GPDX-50L 3** | Gas storage | 48 | 0.73 | — | 118 | 82% | GPDX-50L 3**, GPDX-50L 3*1 |
| GPVL-40 2** | Gas storage | 38 | 0.67 | — | 73 | 79% | G6-PVS4040NV 2**, GPVL-40 2**, GPVL-40 2*1 |
| GPVL-50 2** | Gas storage | 49 | 0.72 | — | 79 | 80% | G6-PVS5040NV 2**, GPVL-50 2*1, HPVL 50 2**, HPVL 50 2*1 |
| GPVNT-40 1** | Gas storage | 38 | 0.73 | — | 91 | 78% | G6-UPT4042NV 1**, GPVNT-40 1** |
| GPVNT-50 1** | Gas storage | 48 | 0.72 | — | 85 | 78% | G6-UPT5040NV 1**, G6-UPT5042NL 1**, GPVNT-50 1** |
| GPVT-40 2** | Gas storage | 38 | 0.70 | — | 87 | 78% | G6-PVT4050NV 2**, G6-PVT4050PV 2*1, GPVT-40 2**, GPVT-40 2*1, GPVT-40L 2**, GPVT-40L 2*1 |
| GPVT-50 2** | Gas storage | 48 | 0.72 | — | 97 | 81% | G6-PVT5050NV 2**, GPVT-50 2**, GPVT-50 2*1, GPVT-50L 2**, GPVT-50L 2*1 |
| GPVX-50L 2** | Gas storage | 50 | 0.73 | — | 119 | 82% | GPVX-50L 2**, GPVX-50L 2*1, HPVX 50L 2**, HPVX 50L 2*1 |
| GUC 40 4** | Gas storage | 38 | 0.64 | — | 83 | 74% | G6N-UT4040NVR 4**, GUC 40 4**, HUC 40 4**, XUC 40 4** |
| GUC-30 4** | Gas storage | 29 | 0.59 | — | 62 | 79% | G6-UT3030NVR 4**, GUC-30 4**, XUC 30 4** |
| GUC-50 4** | Gas storage | 48 | 0.61 | — | 84 | 77% | G6N-UT5040NVR 4**, GUC-50 4**, HUC-50 4**, XUC 50 4** |
| GUF-40 1** | Gas storage | 38 | 0.65 | — | 68 | 73% | G12-UFDT4040NV 1**, GUF-40 1** |
| GUF-50 1** | Gas storage | 48 | 0.70 | — | 83 | 73% | G12-UFDT5040NV 1**, GUF-50 1** |
| GUR 40 4** | Gas storage | 38 | 0.64 | — | 83 | 77% | G12-UT4040NVR 4**, G6-UT4040NL 4**, G9-UT4040NVR 4**, GUR 40 4**, HUR 40 4**, XUR 40 4** |
| GUR-50 4** | Gas storage | 48 | 0.64 | — | 84 | 77% | G12-UT5040NVR 4**, G9-UT5040NVR 4**, GUR-50 4**, HUR-50 4**, XUR 50 4** |
| GURT-50RL 4** | Gas storage | 49 | 0.63 | — | 92 | 77% | G6-UT5050NL 4**, G6-UT5050NVR 4**, GURT-50RL 4**, XURT-50RL 4** |
| HCCC-50T 1** | Gas storage | 49 | 0.86 | — | 98 | 93% | HCCC-50T 1** |
| HDHE-75 4** | Gas storage | 74 | 0.86 | — | 150 | 97% | HDHE-75 4** |
| HESF-40 1** | Electric storage | 37 | 0.92 | — | 64 | 98% | EEA12-40R55DVF 1**, EEA9-40R55DV 1**, EESU-40 1**, EEU6-40R45DV 1**, HESF-40 1**, HESFA-40 1**, PESU-40 1** |
| HESF-50 1** | Electric storage | 46 | 0.92 | — | 67 | 98% | EEA12-50R55DVF 1**, EEA9-50R55DV 1**, EESU-50 1**, EEU6-50R45DV 1**, HESF-50 1**, HESFA-50 1**, PESU-50 1** |
| HETF-40 1** | Electric storage | 36 | 0.93 | — | 63 | 98% | EEA12-40H55DVF 1**, EEA9-40H55DV 1**, EETU-40 1**, EEU6-40H45DV 1**, HETF-40 1**, PETU-40 1** |
| HETF-50 1** | Electric storage | 45 | 0.92 | — | 74 | 98% | EEA12-50H55DVF 1**, EEA9-50H55DV 1**, EETU-50 1**, EEU6-50H45DV 1**, HETF-50 1**, HETFA-50 1**, PETU-50 1** |
| HETF-55 1** | Electric storage | 55 | 0.94 | — | 75 | 98% | EEA12-55H55DVF 1**, EEA9-55H55DV 1**, EETU-55 1**, EEU6-55H45DV 1**, HETF-55 1**, HETFA-55 1**, PETU-55 1** |
| HPACO-45 1**+AXST-50LBTTP 1** | Heat pump | 48 | 3.55 | — | 72 | 428% | HPACO-45 1**+AXST-50LBTTP 1**, HPACO-45C 1**+AXST-50LBCTTP 1* |
| HPACO-45 1**+AXST-50S 1** | Heat pump | 46 | 3.52 | — | 70 | 429% | HPACO-45 1**+AXST-50S 1**, HPACO-45 1**+AXST-50STTP 1**, HPACO-45C 1**+AXST-50SC 1**, HPACO-45C 1**+AXST-50SCTTP 1** |
| HPACO-45 1**+AXST-50T 1** | Heat pump | 45 | 3.52 | — | 67 | 413% | HPACO-45 1**+AXST-50T 1**, HPACO-45 1**+AXST-50TTTP 1**, HPACO-45C 1**+AXST-50TC 1**, HPACO-45C 1**+AXST-50TCTTP 1** |
| HPACO-45 1**+AXST-66 1** | Heat pump | 60 | 3.70 | — | 82 | 435% | HPACO-45 1**+AXST-66 1**, HPACO-45 1**+AXST-66TTP 1**, HPACO-45C 1**+AXST-66C 1**, HPACO-45C 1**+AXST-66CTTP 1** |
| HPACO-45 1**+AXST-80 1** | Heat pump | 73 | 3.80 | — | 95 | 423% | HPACO-45 1**+AXST-80 1**, HPACO-45 1**+AXST-80TTP 1**, HPACO-45C 1**+AXST-80C 1**, HPACO-45C 1**+AXST-80CTTP 1** |
| HPTA-40 2** | Heat pump | 36 | 3.60 | — | 55 | 426% | CAHP-40 2**, HPA10-40H45DV 2**, HPTA-40 2** |
| HPTA-50 2** | Heat pump | 46 | 3.68 | — | 65 | 416% | CAHP-50 2**, HPA10-50H45DV 2**, HPTA-50 2** |
| HPTA-66 2** | Heat pump | 68 | 3.84 | — | 83 | 435% | CAHP-66 2**, HPA10-66H45DV 2**, HPTA-66 2** |
| HPTA-80 2** | Heat pump | 81 | 3.88 | — | 95 | 428% | CAHP-80 2**, HPA10-80H45DV 2**, HPTA-80 2** |
| HPTS-50 2** | Heat pump | 46 | 3.80 | — | 65 | 452% | HPS10-50H45DV 2**, HPSN10-50H45DV 2**, HPTS-50 2** |
| HPTS-66 2** | Heat pump | 67 | 3.70 | — | 82 | 425% | HPS10-66H45DV 2**, HPSN10-66H45DV 2**, HPTS-66 2** |
| HPTS-80 2** | Heat pump | 82 | 3.88 | — | 95 | 430% | HPS10-80H45DV 2**, HPSN10-80H45DV 2**, HPTS-80 2** |
| HPTU-50N 1** | Heat pump | 46 | 3.45 | — | 66 | 407% | HP1050H45DV 1**, HP1050H45DVCTA-1**, HPTU-50CTA 1**, HPTU-50DR 1**, HPTU-50N 1** |
| HPTU-66N 1** | Heat pump | 67 | 3.45 | — | 79 | 265% | HPTU-66CTA 1**, HPTU-66DR 1**, HPTU-66N 1** |
| HPTU-80N 1** | Heat pump | 82 | 3.45 | — | 86 | 233% | HP1080H45DV 1**, HP1080H45DVCTA-1**, HPTU-80CTA 1**, HPTU-80DR 1**, HPTU-80N 1** |
| HPTV-50 2** | Heat pump | 46 | 3.00 | — | 52 | 457% | HPTV-50 2**, HPV10-50H01DV 2** |
| HPTV-66 2** | Heat pump | 68 | 3.20 | — | 76 | 368% | HPTV-66 2**, HPV10-66H01DV 2** |
| HPTV-80 2** | Heat pump | 82 | 3.00 | — | 93 | 373% | HPTV-80 2**, HPV10-80H01DV 2** |
| MHE6-30H-045D 1** | Electric storage | 27 | 0.90 | — | 50 | 98% | E6-30M6-45SV 1**, MHE6-30H-020S 1**, MHE6-30H-045D 1** |
| MHE6-40R-045D 1** | Electric storage | 36 | 0.95 | — | 54 | 98% | E6-40M6-45SV 1**, MHE6-40R-045D 1** |
| MHE6-40RW-035D-1** | Electric storage | 36 | 0.91 | — | 40 | 98% | EMHS-40W-1**, MHE6-40RW-030D-1**, MHE6-40RW-035D-1** |
| PESX-40 1** | Electric storage | 37 | 0.92 | — | 66 | 98% | EEP12-40R55DVF 1**, PESX-40 1** |
| PESX-50 1** | Electric storage | 46 | 0.92 | — | 70 | 98% | EEP12-50R55DVF 1**, PESX-50 1** |
| PETX-40 1** | Electric storage | 37 | 0.92 | — | 64 | 98% | EEP12-40H55DVF 1**, PETX-40 1** |
| PETX-50 1** | Electric storage | 46 | 0.92 | — | 74 | 98% | EEP12-50H55DVF 1**, PETX-50 1** |
| PETX-55 1** | Electric storage | 55 | 0.94 | — | 76 | 98% | EEP12-55H55DVF 1**, PETX-55 1** |
| PG10 34 100 2*V 2** | Gas storage | 33 | 0.90 | — | 170 | 95% | GSP-100 2** |
| R2VA-140E 1** | Electric tankless | — | 0.84 | 1.3 | — | 93% | C2VA-140E 1**, C2VA-140X 1**, R2VA-140E 1**, R2VA-140X 1**, R2VR-140E 1** |
| R2VA-160E 1** | Electric tankless | — | 0.82 | 1.6 | — | 92% | C2VA-160E 1**, R2VA-160E 1**, R2VR-160E 1** |
| R2VR-180E 1** | Electric tankless | — | 0.84 | 1.6 | — | 98% | R2VR-180E 1** |
| R4LA-180E 1** | Electric tankless | — | 0.92 | 1.7 | — | 96% | C4LA-180E 1**, R4LA-180E 1** |
| R4LA-220E 1** | Electric tankless | — | 0.92 | 2.2 | — | 97% | C4LA-220E 1**, R4LA-220E 1**, R4LR-220E 1** |
| R4LA-240E 1** | Electric tankless | — | 0.92 | 2.3 | — | 97–98% | R4LA-240E 1**, R4LR-240E 1** |
| R4LA-280E 1** | Electric tankless | — | 0.92 | 2.5 | — | 98% | C4LA-280E 1**, C4LA-280X 1**, R4LA-280E 1**, R4LA-280X 1**, R4LR-280E 1** |
| R4MA-320E 1** | Electric tankless | — | 0.93 | 2.8 | — | 98% | C4MA-320E 1**, R4MA-320E 1**, R4MR-320E 1** |
| T-H3-DV-N 1** | Gas tankless | — | 0.93 | 5.8 | — | 96% | ACT-199I-N 1**, ACT-199I-P 1*1, ATI-540H 1**, ATI-540H 1*1, ATI-540HX3-N 1**, ATI-540HX3-P 1*1, ATI-540P-N 1**, ATI-540P-P 1*1, GT15-540-NI 1**, GT15-540-PI 1*1, GT15-540P-NI 1**, GT15C-540NI 1** |
| T-H3-OS-N 1** | Gas tankless | — | 0.95 | 5.8 | — | 96% | ACT-199O-N 1**, ACT-199O-P 1*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** |
| T-H3J-DV-N 1** | Gas tankless | — | 0.94 | 4.7 | — | 97% | ATI-240H 1**, ATI-240H 1*1, ATI-240HX3-N 1**, ATI-240HX3-P 1*1, GT15-240-NI 1**, GT15-240-PI 1*1 |
| T-H3J-OS-N 1** | Gas tankless | — | 0.95 | 4.7 | — | 96% | 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 |
| T-H3M-DV-N 1** | Gas tankless | — | 0.90 | 3.3 | — | 94% | ATI-140H 1**, ATI-140H 1*1 |
| T-H3M-OS-N 1** | Gas tankless | — | 0.91 | 3.5 | — | 96% | ATO-140H 1**, ATO-140H 1*1 |
| T-H3S-DV-N 1** | Gas tankless | — | 0.95 | 5.4 | — | 97% | ATI-340H 1**, ATI-340H 1*1, ATI-340HX3-N 1**, ATI-340HX3-P 1*1, GT15-340-NI 1**, GT15-340-PI 1*1 |
| T-H3S-OS-N 1** | Gas tankless | — | 0.94 | 5.3 | — | 97% | ATO-340H 1**, ATO-340H 1*1, ATO-340HX3-N 1**, ATO-340HX3-P 1*1 |
| TK-110U-E 2** | Gas tankless | — | 0.81 | 3.5 | — | 83% | ATO-110U 2**, GT15-110U-O 2** |
| TK-110U-I 2** | Gas tankless | — | 0.81 | 3.5 | — | 85% | ATI-110U 2** |
| TK-310C-NI 1** | Gas tankless | — | 0.81 | 4.6 | — | 85% | ATI-310C 1**, GT15-310C-I 1** |
| TK-310CX3 1** | Gas tankless | — | 0.81 | 4.7 | — | 83% | ATI-310CX3 1** |
| TK-310U-E 2** | Gas tankless | — | 0.81 | 4.8 | — | 86% | ATO-310U 2**, GT15-310U-O 2** |
| TK-310U-I 2** | Gas tankless | — | 0.81 | 4.7 | — | 84% | ATI-310U 2** |
| TK-510C-NI 1** | Gas tankless | — | 0.81 | 4.7 | — | 82% | ATI-510C 1**, GT15-510C-I 1** |
| TK-510CX3 1** | Gas tankless | — | 0.81 | 5.0 | — | 83% | ATI-510CX3 1** |
| TK-510U-E 2** | Gas tankless | — | 0.81 | 5.0 | — | 84% | ATO-510U 2**, GT15-510U-O 2** |
| TK-510U-I 2** | Gas tankless | — | 0.81 | 5.0 | — | 84% | ATI-510U 2** |
| UPVA-110E 1** | Electric tankless | — | 0.93 | 1.0 | — | 98% | UPVA-110E 1** |
| UPVA-110Y 1** | Electric tankless | — | 0.94 | 1.0 | — | 98% | UPVA-110Y 1** |
| UPVA-18K 1** | Electric tankless | — | 0.94 | 0.2 | — | 98% | UPVA-18K 1** |
| UPVA-24K 1** | Electric tankless | — | 0.93 | 0.2 | — | 98% | UPVA-24K 1** |
| UPVA-30K 1** | Electric tankless | — | 0.93 | 0.3 | — | 98% | UPVA-30K 1** |
| UPVA-35E 1** | Electric tankless | — | 0.92 | 0.4 | — | 98% | UPVA-35E 1** |
| UPVA-35K 1** | Electric tankless | — | 0.92 | 0.4 | — | 98% | UPVA-35K 1** |
| UPVA-40Y 1** | Electric tankless | — | 0.93 | 0.4 | — | 98% | UPVA-40Y 1** |
| UPVA-45E 1** | Electric tankless | — | 0.92 | 0.5 | — | 98% | UPVA-45E 1** |
| UPVA-55E 1** | Electric tankless | — | 0.92 | 0.5 | — | 98% | UPVA-55E 1** |
| UPVA-55Y 1** | Electric tankless | — | 0.93 | 0.5 | — | 98% | UPVA-55Y 1** |
| UPVA-70E 1** | Electric tankless | — | 0.92 | 0.7 | — | 98% | UPVA-70E 1** |
| UPVA-80Y 1** | Electric tankless | — | 0.94 | 0.8 | — | 98% | UPVA-80Y 1** |
| UPVA-90E 1** | Electric tankless | — | 0.93 | 0.8 | — | 98% | UPVA-90E 1** |
A range means the models under one basic model differ. A dash means the model has no such figure.
This brand's highest UEF, the energy that reaches the water for each unit used, is 3.88. A heat pump reaches this UEF by taking heat from the air around it. The HPTA-80 2** is one of 2 basic models with that UEF. Of its 186 basic models, 40 list an ENERGY STAR certified model.
This brand lists 6 kinds: gas storage, electric storage, gas tankless, electric tankless, heat pump, and tabletop. This brand's highest first-hour rating is 170 gallons, on the PG10 34 100 2*V 2**. In the test, a full tank reheats while those 170 gallons are drawn. This brand's highest tankless flow belongs to the ATM-199M-N 1**. That flow is 6.0 gallons per minute for water warmed by 67°F.
This brand's 639 model numbers rank it below one of the 117 brands on this site. Each of 12 other brands shares at least one basic model number with this brand. The largest overlap is with State, at 180 basic model numbers.
Basic models shared with other brands
| Brand | Shared basic models |
|---|---|
| State | 180 |
| American | 158 |
| RELIANCE WATER HEATERS | 150 |
| Lochinvar | 134 |
| U.S. Craftmaster | 33 |
| John Wood | 24 |
| GSW WATER HEATERS | 23 |
| Takagi | 18 |
| Giant | 4 |
| Envirosense | 2 |
| Envirosense Enercare | 2 |
| Envirosense Reliance Home Comfort | 2 |