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10 Best 40 Gallon Hot Water Heaters 2025 in the United States

From leading brands and best sellers available on the web.

Sponsored

Kohree 12"

Kohree

43%OFF

Kohree 12"x18" 12V RV Water Tank Heating Pad, Use with Up to 50 Gallons Fresh Water, 2 Pack RV Holding Tank Heater Pad with Thermostat, for Camper, Trailer, Motorhome, Marine, RV Winterizing

#1

Winner

Suburban M

Suburban

Suburban Manufacturing Suburban Co 5238A Sw6D W/H 6 Gal Dsi

Sponsored

Kohree 12"

Kohree

43%OFF

Kohree 12"x18" 12V RV Water Tank Heating Pad, Use with Up to 50 Gallons Fresh Water, 2 Pack RV Holding Tank Heater Pad with Thermostat, for Camper, Trailer, Motorhome, Marine, RV Winterizing

#2
BOSCH Elec

Bosch

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

#3
Corro-Prot

Corro-Protec

Corro-Protec Powered Anode Rod for Water Heater, 20-Year Warranty, Eliminates Rotten Egg/Sulfur Smell within 24 hours, Stops Corrosion and Reduces Limescale, Electrical Anode Rod Made of Titanium

#4
BOSCH Elec

Bosch

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

#5
GE Applian

GE

GE Appliances 18 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Want It, 120 Volt

#6
Rheem 18kW

Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

#7
RV Tankles

BRFCQ

RV Tankless Water Heater, 55000 BTUs RV Instant Hot Water Heater with 15 x 15 inches Door & Remote Controller, DC 12V MAX 3.9GPM, Propane Gas Power Technology, Compatible with All RVs(White)

#8
EcoSmart E

EcoSmart

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

#9
EcoSmart E

EcoSmart

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

#10
3000W Elec

JHiveGym

3000W Electric Tankless Water Heater,Instant Hot Water Heater On Demand Water Heater Under Sink With Remote Control,110V Digital Display On Demand Hot Water Heater

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