Tankless Water Heater Electric Comparison 3500W Water heater Add to Cart 9000W Water heater Buying Options 4500W Water heater Add to Cart 3500W Water heater Buying Options 3000W Water heater Add to Cart 6500W Water heater Add to Cart 3000W Water heater Add to Cart Customer Reviews 4.3 out of 5 stars 22 4.4 out of 5 stars 24 4.0 out of 5 stars 85 2.9 out of 5 stars 13 5.0 out of 5 stars 2 4.0 out of 5 stars 85 2.8 out of 5 stars 12 Price $99.99$99.99 — $69.99$69.99 — $89.99$89.99 $109.99$109.99 $83.80$83.80 Wattage 3.5KW 9KW 4.5KW 3.5KW 3KW 6.5KW 3KW Breakers Required (1 x 40)AMP (1 x 40)AMP (1 x 45)AMP (1 x 40)AMP (1 x 32)AMP (1 x 40)AMP (1 x 32)AMP Max Amperage 40A 40A 45A 40A 32A 40A 32A Voltage 110V 220V 110V 110V 110V 240V 110V Plug No No No No No No Yes Water Connections 1/2'' NPT 1/2'' NPT 1/2'' NPT 1/2'' NPT 1/2'' NPT 1/2'' NPT 1/2'' NPT What to do if the hot water temperature of the hot water heater is not enough？ The tankless water heater electric temperature is controlled by the water flow. The larger the water flow, the lower the temperature; the smaller the water flow, the higher the temperature. Can I use it for bathing? No, but you can buy a higher power water heater that can meet your bathing needs. Is the instant water heater safe? Instant water heaters are designed with safety in mind, typically featuring non-metallic heating elements, electrical and water isolation technology, and leakage protection devices.