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Best picks

Best Tankless Water Heaters

These picks come straight from the data: verified Amazon ratings, review counts, and prices we observed on recorded dates across 11 tracked products. No sponsored placements, no guesses. Prices last checked 2026-08-24.

As an Amazon Associate, this site earns from qualifying purchases. Product links are affiliate links, and prices and availability shown are accurate as of the date noted and can change. See our editorial policy for details.

Top rated

Rinnai RX180iN Condensing Smart-Sense Tankless Water Heater

Highest Amazon rating among the products we track.

Amazon rating: 4.8 across 49 ratings. Price observed: $1,409.94 on 2026-08-24.

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Most reviewed

Bosch Tronic 3000 T 2.5-Gallon Electric Mini-Tank Water Heater (ES2.5)

Largest Amazon review count among the products we track.

Amazon rating: 4.3 across 11,249 ratings. Price observed: $225.99 on 2026-08-24.

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Lowest observed price

EcoSmart ECO 11 Electric Tankless Water Heater, 13kW at 240V

Lowest price we observed among tracked products rated 4.0 or higher with 50+ ratings.

Amazon rating: 4.3 across 5,872 ratings. Price observed: $199.99 on 2026-08-24.

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Also worth a look

Stiebel Eltron Tempra 24 Trend Electric Tankless Water Heater, 24kW 240V

Next-highest Amazon rating among the products we track.

Amazon rating: 4.5 across 92 ratings. Price observed: $545.88 on 2026-08-24.

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Everything we track, ranked

Tracked products ranked by verified Amazon rating (prices observed 2026-08-24)
ModelAmazon ratingObserved priceChecked
Rinnai RX180iN Condensing Smart-Sense Tankless Water Heater4.8 (49 ratings)$1,409.942026-08-24
Rheem RTGH Series 6.8 GPM Natural Gas Condensing Tankless Water Heater, 120,000 BTU4.5 (12 ratings)$1,0012026-08-24
Stiebel Eltron Tempra 24 Trend Electric Tankless Water Heater, 24kW 240V4.5 (92 ratings)$545.882026-08-24
Rheem RTEX-13 240V Residential Electric Tankless Water Heater4.4 (1,404 ratings)$2802026-08-24
Stiebel Eltron Tempra 29 Plus Electric Tankless Water Heater, 28.8kW 240V4.4 (450 ratings)$694.872026-08-24
Bosch Tronic 3000 T 2.5-Gallon Electric Mini-Tank Water Heater (ES2.5)4.3 (11,249 ratings)$225.992026-08-24
Bosch Tronic 3000 T 7-Gallon Electric Mini-Tank Water Heater (ES8)4.3 (11,249 ratings)$386.992026-08-24
EcoSmart ECO 11 Electric Tankless Water Heater, 13kW at 240V4.3 (5,872 ratings)$199.992026-08-24
EcoSmart ECO 18 Electric Tankless Water Heater, 18kW at 240V4.3 (2,443 ratings)$409.512026-08-24
EcoSmart ECOS 27 Electric Tankless Water Heater, 27kW at 240V4.1 (14 ratings)$5492026-08-24
Rheem RTG Series 8.4 GPM Natural Gas Tankless Water Heater, 180,000 BTU Non-Condensing4.0 (31 ratings)$949.992026-08-24