Top 5 tankless water heaters reviewed and ranked.
Stiebel Eltron Tempra 36 Plus is our top pick for tankless water heaters — an averaged 4.8/5 across 1 published review at about $812. Runner-up: Rheem RTEX-24 (~$485).
| # | Product | Rating | Price | Best for | |
|---|---|---|---|---|---|
| 1 | Stiebel Eltron Tempra 36 PlusTop Score | 4.8 (1 source) | $812 | whole-home electric tankless installs in mild climates | $812 · Check Price on Amazon |
| 2 | 4.7 (1 source) | $485 | northern US homes with cold groundwater inlet | $485 · Check Price on Amazon | |
| 3 | 4.6 (1 source) | $540 | homes with 2-3 simultaneous showers in mild climates | $540 · Check Price on Amazon | |
| 4 | 4.7 (1 source) | $1,100 | northern homes with natural gas service | $1,100 · Check Price on Amazon | |
| 5 | 4.5 (1 source) | $300 | additions, outbuildings, sheds, and single-fixture installs | $300 · Check Price on Amazon |
The Tempra 36 Plus is the best-overall pick — Stiebel Eltron's flow control handles whole-home demand without cold-water sandwiching.
The RTEX-24 is the cold-climate pick — Rheem's flagship that handles northern winter inlet temps better than competitors.
The ECO 27 is the high-flow pick — EcoSmart's best GPM-to-price ratio for households with multiple simultaneous hot-water demands.
The V75iN is the gas tankless pick — Rinnai's whole-home unit for households with natural gas service.
The RTEX-13 is the point-of-use pick — Rheem's compact tankless for a single sink or shower. Best for additions and outbuildings.
| Spec | Stiebel Eltron Tempra 36 Plus | Rheem RTEX-24 | EcoSmart ECO 27 | Rinnai V75iN Gas Tankless | Rheem RTEX-13 Point-of-Use |
|---|---|---|---|---|---|
| Type | Electric whole-home | Electric whole-home | Electric whole-home | Natural gas | Point-of-use electric |
| Power | 36 kW | 24 kW | 27 kW | — | 13 kW |
| Warranty | 10-year combined | — | Lifetime elements | — | — |
| Max GPM | — | — | 6.6 | 7.5 | — |