Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.
Rheem RTEX-24 comes out ahead by a narrow margin (4.5 vs 4.7). The gap is mostly about northern US homes with cold groundwater inlet — read the strengths below before deciding.
The RTEX-13 is the point-of-use pick — Rheem's compact tankless for a single sink or shower. Best for additions and outbuildings.
The RTEX-24 is the cold-climate pick — Rheem's flagship that handles northern winter inlet temps better than competitors.
Point-of-use only. Compact. Cheapest pick.
Best for cold climates. Most user reviews. Cheaper than Tempra.
| Spec | Rheem RTEX-13 Point-of-Use | Rheem RTEX-24 |
|---|---|---|
| Type | Point-of-use electric | Electric whole-home |
| Power | 13 kW | 24 kW |
| Use | Single fixture | — |
| Form | Compact | — |
| Self-Modulating | — | Yes |
| Reviews | — | 3,900+ |