10 bestTankless Hot Water Heatersof October 2025
112M consumers helped this year.
1

RINNAI RXP199iN Condensing Tankless Water Heater RXP199 Features 0.96 UEF with 199k BTU and Pump.
Rinnai

9.8
2

Tankless Water Heater Electric 27kW 208~240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A Gray
thermomate

9.6
20% off
3

Tankless Water Heater, GASLAND Outdoors BE158B 1.58GPM 6L Portable Gas Water Heater, Instant Propane Water Heater, Overheating Protection, Easy to Install, Use for RV Cabin Barn Camping Boat, Black
GASLAND

9.4
4

Rheem 11kW 240V Tankless Electric Water Heater
Rheem

9.2
5

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem

9.0
OtherUp to 27% off
6% off
6

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, Small Grey
Rheem

8.7
7

VEVOR Instant Water Heater, 18kw Electric Tankless Water Boiler, Digital Temperature Display & Easy Installation & 24-Hour Water Supply, for Kitchen Bathroom Shower Mall Salon Shampoo ETL Listed
VEVOR

8.5
8

thermomate Electric Tankless Water Heater, 11kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 2.15GPM at 35°F Rise
thermomate

8.3
9

Rinnai V53DeN Natural Gas Tankless Hot Water Heater, 5.3 GPM, Outdoor Installation
Rinnai

8.0
10

Stiebel Eltron Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White - 23, Gloss White
Stiebel Eltron

7.8
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