John Wood water heaters
25 basic models and 52 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 |
|---|---|---|---|---|---|---|---|
| ATHR-160M 1** | Gas tankless | — | 0.95 | 4.8 | — | 98% | JTHR-160M 1**, JTHR-160X3 1** |
| ATHR-180M 1** | Gas tankless | — | 0.95 | 5.3 | — | 97% | JTHR-180M 1**, JTHR-180X3 1** |
| ATHR-199M 1** | Gas tankless | — | 0.95 | 5.9 | — | 98% | JTHR-199M 1**, JTHR-199X3 1** |
| GCF-40 1** | Gas storage | 38 | 0.64 | — | 70 | 73% | JW640T40N-AV-ES2 1**, JW640T40P-AV-ES2 1*1 |
| GCF-50 1** | Gas storage | 48 | 0.69 | — | 84 | 80% | JW650T40N-AV-ES2 1**, JW650T40P-AV-ES2 1*1 |
| GCFL-40 1** | Gas storage | 38 | 0.66 | — | 65 | 77% | JW640S40P-AV-ES2 1*1, JW8640S40N-AV-ES2 1** |
| GCFL-50 1** | Gas storage | 49 | 0.69 | — | 78 | 79% | JW650S40N-AV-ES2 1** |
| GPDL-40 3** | Gas storage | 38 | 0.68 | — | 74 | 79% | PDV40N 3**, PDV40P 3*1 |
| GPDT-50 3** | Gas storage | 48 | 0.72 | — | 79 | 79% | PDV50N 3**, PDV50P 3*1 |
| GPDX-50L 3** | Gas storage | 48 | 0.73 | — | 118 | 82% | PDV50HIN 3**, PDV50HIP 3*1 |
| GPVL-40 2** | Gas storage | 38 | 0.67 | — | 73 | 79% | PV40N 2**, PV40P 2*1 |
| GPVL-50 2** | Gas storage | 49 | 0.72 | — | 79 | 80% | PV50N 2**, PV50NM 2**, PV50P 2*1, PV50PM 2*1 |
| GPVT-40 2** | Gas storage | 38 | 0.70 | — | 87 | 78% | PV40TN 2**, PV40TP 2** |
| GPVT-50 2** | Gas storage | 48 | 0.72 | — | 97 | 81% | PV50TN 2**, PV50TP 2** |
| GPVX-50L 2** | Gas storage | 50 | 0.73 | — | 119 | 82% | PV50HIN 2**, PV50HINM 2**, PV50HIP 2**, PV50HIPM 2** |
| HPACO-45 1**+AXST-50LBTTP 1** | Heat pump | 48 | 3.55 | — | 72 | 428% | JWHPCO-45 1**+JWXST-50LBTTP 1* |
| HPACO-45 1**+AXST-50S 1** | Heat pump | 46 | 3.52 | — | 70 | 429% | JWHPCO-45 1**+JWXST-50STTP 1** |
| HPACO-45 1**+AXST-50T 1** | Heat pump | 45 | 3.52 | — | 67 | 413% | JWHPCO-45 1**+JWXST-50T 1**, JWHPCO-45 1**+JWXST-50TTTP 1** |
| HPACO-45 1**+AXST-66 1** | Heat pump | 60 | 3.70 | — | 82 | 435% | JWHPCO-45 1**+JWXST-66 1**, JWHPCO-45 1**+JWXST-66TTP 1** |
| HPACO-45 1**+AXST-80 1** | Heat pump | 73 | 3.80 | — | 95 | 423% | JWHPCO-45 1**+JWXST-80 1**, JWHPCO-45 1**+JWXST-80TTP 1** |
| JWHPCO-45 1**+JWXST-50S 1** | Heat pump | 46 | 3.52 | — | 70 | 429% | JWHPCO-45 1**+JWXST-50S 1** |
| T-H3-DV-N 1** | Gas tankless | — | 0.93 | 5.8 | — | 96% | JCT-199-N 1**, JCT-199-P 1*1, JWT-540H-N 1**, JWT-540H-P 1*1, JWT-540P-NIH 1**, JWT-540P-PIH 1*1 |
| T-H3J-DV-N 1** | Gas tankless | — | 0.94 | 4.7 | — | 97% | JWT-240H-N 1**, JWT-240H-P 1*1 |
| T-H3M-DV-N 1** | Gas tankless | — | 0.90 | 3.3 | — | 94% | JWT-140H-P 1*1 |
| T-H3S-DV-N 1** | Gas tankless | — | 0.95 | 5.4 | — | 97% | JWT-340H-N 1**, JWT-340H-P 1*1 |
A range means the models under one basic model differ. A dash means the model has no such figure.
Hot water out per unit of energy in, called UEF, reaches 3.80 among John Wood models. A heat pump reaches this UEF by taking heat from the air around it. The HPACO-45 1**+AXST-80 1** is the one basic model of this brand with that UEF. ENERGY STAR certified model numbers are missing from 15 of its 25 basic models.
Its range spans 3 kinds: gas storage, gas tankless, and heat pump. The GPVX-50L 2** holds this brand's highest first-hour rating: 119 gallons. Those 119 gallons include water the tank heats while the hour runs. Its tankless models reach their highest flow on the ATHR-199M 1**. That flow is 5.9 gallons per minute for water warmed by 67°F.
Of the 117 brands on this site, 17 list more model numbers than John Wood. Each of 9 other brands shares at least one basic model number with this brand. Of those, A. O. Smith lists the most: 24 of this brand's 25.
Basic models shared with other brands
| Brand | Shared basic models |
|---|---|
| A. O. Smith | 24 |
| American | 24 |
| State | 24 |
| Lochinvar | 23 |
| RELIANCE WATER HEATERS | 22 |
| GSW WATER HEATERS | 18 |
| Giant | 4 |
| Takagi | 4 |
| U.S. Craftmaster | 1 |