25 Rheem products rated

Rheem tankless water heaters: every model rated (2026)

Every Rheem tankless water heater we review, sorted by rating. The Rheem 18 kW Electric, 240V leads with 9.3/10.

Rheem has 23 complete heaters and two parts in our catalogue, on electric, propane and natural gas, for indoor and outdoor mounting. The best-rated is the Rheem 18 kW Electric, 240V at 9.3/10. Ten of them have a buyer review record; the rest are rated from what their listings state. In our rankings, the Rheem RTGH 8.4 GPM Natural Gas Indoor is #2 in our high-efficiency tankless ranking, #4 in our best tankless water heaters ranking, #4 in our whole-house tankless ranking and #5 in our gas tankless water heaters ranking, the Rheem RTG 9.5 GPM Natural Gas Indoor is #5 in our best tankless water heaters ranking, the Rheem 18 kW Electric, 240V is #1 in our whole-house electric tankless ranking and the Rheem Prestige Condensing Natural Gas is #5 in our high-efficiency tankless ranking. Scroll down for the whole range, sorted by rating.

Category

Rating

Sort by

25 products

9.3/10

4.4 GPM · 18 kW · 240 VRheem 18 kW Electric, 240V$422.92 on Sep 30, 2026, may have changed2,187 buyer reviews

8.3/10

5.9 GPM · 24 kW · 240 VRheem RTEX-24, 24 kW 240V$549 on Sep 30, 2026, may have changed893 buyer reviews

7.8/10

9.5 GPM · 199,900 BTU/hRheem RTGH 9.5 GPM Propane Indoor$1,383.15 on Sep 30, 2026, may have changedSpec-based rating

7.7/10

8.4 GPM · 180,000 BTU/hRheem RTG 8.4 GPM Natural Gas Outdoor$964.10 on Sep 30, 2026, may have changedSpec-based rating

7.6/10

7 GPM · 160,000 BTU/hRheem RTG 7.0 GPM Natural Gas Outdoor$819.08 on Sep 30, 2026, may have changedSpec-based rating

7.6/10

8.4 GPM · 180,000 BTU/hRheem RTG 8.4 GPM Propane Indoor$953 on Sep 30, 2026, may have changedSpec-based rating

7.5/10

7 GPM · 160,000 BTU/hRheem RTG 7.0 GPM Propane Indoor$785.13 on Sep 30, 2026, may have changedSpec-based rating

7.5/10

8.4 GPM · 180,000 BTU/hRheem RTG 8.4 GPM Propane Outdoor$953 on Sep 30, 2026, may have changedSpec-based rating

7.3/10

Rheem RTG20280-1 Vent Termination Kit$119 on Sep 30, 2026, may have changedSpec-based rating

7.3/10

8.4 GPM · 157,000 BTU/hRheem RTGH 8.4 GPM Natural Gas Indoor$1,168.99 on Sep 30, 2026, may have changed60 buyer reviews

7.2/10

2.68 GPM · 11 kW · 240 VRheem 11 kW Multi Fixture, 240V$255 on Sep 30, 2026, may have changedSpec-based rating

7.2/10

1.95 GPM · 8 kW · 240 VRheem 8 kW Multi Fixture, 240VSee current priceSpec-based rating

7.2/10

9.5 GPM · 199,900 BTU/hRheem RTG 9.5 GPM Natural Gas Indoor$1,047.92 on Sep 30, 2026, may have changed88 buyer reviews

7.1/10

9.5 GPM · 199,900 BTU/h · 120 VRheem RTGH-95DVLN-3 Natural Gas Indoor$1,454.31 on Sep 30, 2026, may have changed62 buyer reviews

7.1/10

Rheem RH17920 Recirculation Pump Kit$246 on Sep 30, 2026, may have changedSpec-based rating

7.0/10

3.5 kW · 120 VRheem 3.5 kW Point-of-Use, 120V$148.95 on Sep 30, 2026, may have changedSpec-based rating

7.0/10

7 GPM · 160,000 BTU/hRheem RTG 7.0 GPM Natural Gas Indoor$653.77 on Sep 30, 2026, may have changed65 buyer reviews

6.7/10

3.17 GPM · 240 VRheem RTEX-13, 240VSee current priceSpec-based rating

6.7/10

7 GPM · 160,000 BTU/hRheem RTG 7.0 GPM Propane Outdoor$770.17 on Sep 30, 2026, may have changed55 buyer reviews

6.0/10

6.5 kW · 240 VRheem RTEX-06T, 6.5 kW 240V$189 on Sep 30, 2026, may have changedSpec-based rating

5.9/10

6 GPM · 36 kWRheem RETEX-36 Performance, 36 kW$752.99 on Sep 30, 2026, may have changedSpec-based rating

5.8/10

240 VRheem RTEX-27, 240V$689.99 on Sep 30, 2026, may have changedSpec-based rating

5.5/10

9 GPM · 180,000 BTU/hRheem RTGH 9.0 GPM Natural Gas Indoor$1,219.99 on Sep 30, 2026, may have changed30 buyer reviews

4.5/10

36 kW · 240 VRheem RTEX-36, 36 kW 240V$799.99 on Sep 30, 2026, may have changed22 buyer reviews

4.4/10

11 GPMRheem Prestige Condensing Natural Gas$1,199.99 on Sep 30, 2026, may have changed27 buyer reviews

Product images: Amazon listings

Common questions

Is Rheem a good tankless water heater brand?

We rate models, not brands, and a brand line can hold strong and weak listings. Here, Rheem's ratings run 4.4/10 to 9.3/10 across 23 heaters, and four of its models make our top 5 lists.

Which Rheem tankless water heater is rated highest?

The Rheem 18 kW Electric, 240V, at 9.3/10, from 2,187 buyer reviews averaging 4.2/5 and its listed specs.

Does Rheem make an outdoor tankless water heater?

Yes: Rheem RTG 8.4 GPM Natural Gas Outdoor, Rheem RTG 7.0 GPM Natural Gas Outdoor and Rheem RTG 7.0 GPM Propane Outdoor state outdoor mounting in their listings.

Where do the Rheem ratings come from?

From each exact listing: what buyers rate it, how many reviews it has and how completely the seller documents the specs, weighed with the formula on our methodology page. We have not installed these heaters ourselves.