Find the Best Tankless Water Heater for Your Home
We compare and rank gas, propane, and electric tankless water heaters on rated flow, efficiency and real install cost, using manufacturer specs, owner reviews and published tests — so you get endless hot water without the guesswork.
Latest Reviews & Guides
Rheem RTEX-18 Review 2026: 1.8 or 4.4 GPM? What 18 kW Really Delivers, RTEX vs RETEX, and the 1-Year Parts Warranty
Rheem RTEX-18 review: 18 kW on two 40 A breakers, 1.8 GPM in northern winters vs 4.4 GPM in the Gulf, RETEX-18 vs RTEX-18, and the 5-year leak warranty.
Best PicksRheem IKONIC Review 2026: S vs SR, Retail vs Pro Models, and the 12,000-Hour Warranty Cap
Rheem IKONIC review for 2026: 0.96 UEF, 4.7 to 9.2 GPM by groundwater temperature (not 11.2), S vs SR pump models, ECOHS vs RTGH-S trims, and the 12,000-hour warranty cap.
Best PicksNavien NPE-240S2 Review 2026: Winter GPM, the $389 Pump Question, and the Warranty Catch
Navien NPE-240S2 review for 2026: 0.96 UEF, 4.6 to 8.7 GPM by groundwater temperature (not 11.2), $1,810 vs $2,199 for the NPE-240A2, and why buying it online voids Navien's warranty.
Best PicksRinnai RX199iN Review 2026: Sensei RX vs RXP199iN vs the Old RU199iN, and the Warranty Fine Print
Rinnai RX199iN review for 2026: 0.98 UEF, 4.6 to 9.0 GPM by groundwater temperature (not 11.1), $1,532.79 to $1,768.98 at Rinnai-authorized dealers, and why the RXP199iN beats adding the $510 pump kit later.
Best PicksTankless Water Heater Brands 2026: Who Actually Makes Each One (and the 7 Worth Buying)
The best tankless water heater brands for 2026, ranked, plus who really builds them: ENERGY STAR's gas-tankless list shows two companies behind 72% of US models, one A.O. Smith heater under six badges, and Rheem owning EcoSmart.
Best PicksVEVOR Tankless Water Heater Review 2026: Electric, Propane and RV Units, and the Specs VEVOR Doesn't Publish
VEVOR sells 10 electric tankless heaters (8-36 kW, $122.99-$419.90), outdoor and indoor propane units, and 15x15 RV heaters. Real GPM math for every size, the 12-month warranty, the breaker sizes, and the one VEVOR to skip.
Why Trust TanklessHeaterLab?
How We Research and Compare
We compare rated GPM, UEF efficiency, warranty terms and install cost, and name the source behind every number. We don't test products ourselves.
Tankless Specialists
Gas, propane, condensing, and electric on-demand units — we know Rinnai from Rheem and UEF from GPM.
Every Budget
From under-$200 point-of-use electric units to premium condensing whole-home systems — clearly labelled.
Updated for 2026
Prices, picks, efficiency ratings, and tax-credit notes kept current.
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