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5 Best Electric Water Heater Tanklesses of 2025

Last Updated - 2025/07/20

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Rheem

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

Rheem

CA$761.92

More Details
Main highlights
- Self-modulating power control
- On demand, consistent and continuous hot water
- ON/OFF Dial Control with adjustable digital temperature display
- Bottom 3/4" NPT water connections
- 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
CA$761.92
2

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Rheem

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

Rheem

CA$650.00

More Details
Main highlights
- Threaded for easy replacement, simple installation, digital temperature display
- Simple installation – bottom 3/4 inch NPT water connections
- Most advanced self-modulation, adjust power to meet hot water demand
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
CA$650.00
3
Best Value
20% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

thermomate
20% Off

thermomate Tankless Water Heater Electric, 8kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 1.56GPM at 35°F Rise

thermomate

CA$239.99

CA$299.99
(20% Off)

More Details
Main highlights
- [Save Money and Space] - Self-modulating technology auto regulating the amount of energy required to heat water by continuously detecting water temperature and flow rate with 99% heating efficiency, saving up to 60% on water heating cost comparing to traditional tank water heater. Side water connection and wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces
- [Leak Proof & Maintenance Free] - The first to use cast aluminum heating chamber, Heating element separated from water lines to prevent water leaking and scale & corrosion on heating element, ensuring high heating efficiency and extending usage life span
- [Instant Endless Hot Water] - Provide instant hot water wherever and whenever you need it. 24 hours standby. 8kW powerful heating support up to 2 faucets and large 1.56GPM at 35°F temperature rise. Max temperture up to 131°F. Requires Double Pole 40Amp breaker
- [Easy Installation] - 1/2 NPT side water connections, 8kW at 240V, 33.3A nominal current, requiring 40AMP double pole breaker and 8AWG wires
- [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection, 1/2 NPT side water connections, 8kW at 240V, 33.3A nominal current, 40AMP double pole breaker and 8AWG wires
CA$239.99
CA$299.99 (20% Off)
4
18% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

thermomate
18% Off

Tankless Water Heater Electric 18kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Digital Temperature Display Easy Installation, for Residential Whole House Shower, 76A Gray

thermomate

CA$447.99

CA$549.99
(18% Off)

More Details
Main highlights
- [Smart Operation] - Auto adjusting energy consumption basing on income water temperature and flow, ensuring maximum efficiency, continuous stable temperature and optimal power usage. Digital temperature display allowing adjustment in 1° increment from 80°F to 140°F. Heating element separated from water tube significantly reducing scale, corrosion and mineral buildup on the element, achieving better performance and low maintenance.
- [Save Money and Space] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
- [Instant Unlimited Hot Water] - On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Requires 80Amp breaker (2 Sets of Double-pole 40AMP Breakers)
- [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
- NOTE - Make sure this water heater is the correct size for your hot water need: 18kW 208 ~ 240V (adjustable) draw max 76amp; Required breaker 2 x Double-POLE 40AMP; Wire gauge 2 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT.
CA$447.99
CA$549.99 (18% Off)
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ranein

Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving

Ranein

CA$419.00

More Details
Main highlights
- SIMPLE: The endless hot water heater electric features knob controls and an LED display. With an adjustment range from 86°F to 131°F in 1°F increments, just simply set the temperature and enjoy stable and ample hot water.
- SAVE: Compared to tank-type water heaters, electric tankless water heater don't require preheating. There's no energy consumption when not in use. It saves 60% of heating costs. Additionally, it's more compact and can be installed anywhere.
- SAFE: The instant electric tankless water heater is applied with multiple protections, like leakage protection, overheating protection, and drop test, damp proof, every unit electric tankless water heater goes through strict tests to ensure 100% safety and it is listed by CSA.
- POWERFUL: This electric water heater's on-demand thermal efficiency reaches up to 99%. With a flow rate of up to 4.3GPM, it's suitable for 2-3 usage points throughout the house. No waiting for preheating. Provides endless ample hot water.
- NOTE: Make sure this water heater tankless is sized for your hot water needs: 18 kW; 240 volts; circuit breaker required 2 x bipolar 40 amps; unit dimensions 13.8" x 3.1" x 18.7"; water connection 3/4" NPT.
CA$419.00

5 Best Electric Water Heater Tanklesses of 2025

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

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

thermomate Tankless Water Heater Electric, 8kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 1.56GPM at 35°F Rise

Tankless Water Heater Electric 18kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Digital Temperature Display Easy Installation, for Residential Whole House Shower, 76A Gray

Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving

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