# Rheem RTEX-18: specs and price

**Price (US):** $523.99 (US retail price $523.99 listed verbatim on FactoryPure product page (SKU RTEX-18, "$ 523.99", data-price-raw="52399"), accessed 2026-07-11. Rheem.com publishes no MSRP for this model.), as of 2026-07-11. Among the 7 tankless water heaters we track it is the cheapest; category median $1295.62.
**Brand:** Rheem
**Deskmark:** Bronze Deskmark — pay-blind category standing 0/100, #8 of 8 in class (independent, computed from sourced data, never for sale).

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $523.99 |
| Brand | Rheem |
| Fuel type | electric |
| Max flow rate gpm | 4.4 |
| Max btu per hour | — |
| Power input (kW) | 18 |
| Uniform energy factor | 0.94 |
| Condensing type | electric |
| Min activation flow gpm | 0.3 |
| Vent type | none |
| Max temp f | 140 |
| Heat exchanger warranty yrs | 5 |
| Wi-Fi enabled | No |
| Weight (lb) | — |

## Where it stands

At $524, the Rheem RTEX-18 is the cheapest of the 7 tankless water heaters we track, where the median is $1295.62. On the spec sheet, its max flow rate gpm of 4.4 is the lowest of the 8, its min activation flow gpm of 0.3 is the lowest of the 7, and its heat exchanger warranty yrs of 5 is the lowest of the 7.

## Frequently asked questions

**How much does the Rheem RTEX-18 cost?**

The Rheem RTEX-18 has a US price of $523.99 (US retail price $523.99 listed verbatim on FactoryPure product page (SKU RTEX-18, "$ 523.99", data-price-raw="52399"), accessed 2026-07-11. Rheem.com publishes no MSRP for this model.), as of 2026-07-11.

**How does the Rheem RTEX-18 compare on price?**

At $524, the Rheem RTEX-18 is the cheapest of the 7 tankless water heaters we track, where the median is $1295.62.

**What are the Rheem RTEX-18's key specs?**

Rheem RTEX-18 (Rheem): fuelType electric, maxFlowRateGpm 4.4, powerInputKw 18, uniformEnergyFactor 0.94, condensingType electric. Full sourced spec sheet verified 2026-07-11.

Source: https://www.rheem.com/product/rheem-professional-classic-series-tankless-electric-rtex-18-kw-rtex-18/ (rheem.com, accessed 2026-07-11)
Corroboration: https://factorypure.com/products/rheem-rtex-18-classic-18-kw-4-4-gpm-tankless-electric-water-heater-indoor-240v-new (accessed 2026-07-11)
Canonical: https://frontdeskreview.com/product/tankless-water-heaters/rheem-rtex-18/
Cite: Per The Front Desk Review, the Rheem RTEX-18 price of record was $523.99 as of 2026-07-11 — https://frontdeskreview.com/product/tankless-water-heaters/rheem-rtex-18/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl