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How Does the Hubbell Tankless Water Heater Work?

Hubbell has applied its 88 years of water heating experience and engineered a tankless electric water heater that will provide many years of reliable service in your home. The cold water enters the unit and passes through a flow meter and inlet thermistor which measure the precise flow rate and temperature of the incoming water. The control system uses advanced logic with solid state switching devices to fully modulate the power to the heating elements from 0-100% to provide the most accurate and consistent hot water temperatures in the industry. As the water flows out of the unit a second thermistor makes any necessary adjustments to ensure the Hubbell Tankless delivers accurate and consistent hot water. With numerous control features including the ability to track kW hours consumed, operating cost and hot water usage, the Hubbell Tankless allows the homeowner to maximize their savings and gain the most benefit from their investment.

How does the Hubbell Tankless Water Heater Work

Electrical Requirements

Hubbell Tankless Model No. 110-2 145-2 165-2 180-2 220-3 240-3 280-3
Electrical Requirements
kW @ 240V 11 14 16 18 21 24 27
Amps @ 240V 45.8 58.3 66.7 75.0 87.5 100.0 112.5
Min. Recommended Amperage to Home 100 100 125 150 200 200 200
Multiple Circuit Breaker Installation (US Only)
Minimum Double-Pole Circuit
Breaker Size (quantity x amps)
2 x 25 2 x 35 2 x 40 2 x 40 2 x 50 2 x 60 2 x 60
3 x 40 3 x 40
Min. Feed Wire Size at 75°C
THHN or Equivalent (AWG Copper)
8 8 8 8 8 6 6
8 8
Single Cicuit Breaker Installation (Canada & US)
Minimum Double-Pole Circuit
Breaker Size (quantity x amps)
1 x 50 1 x 70 1 x 80 1 x 80 1 x 100 1 x 110 1 x 125
Min. Feed Wire Size at 75°C
THHN or Equivalent (AWG Copper)
8 6 4 4 3 2 1

If actual supply voltage is less than 240V, the kW will be reduced, see de-rating factors below:
If 230 Volt multiply kW by 0.92
If 220 Volt multiply kW by 0.84
If 208 Volt multiply kW by 0.75

To solve for flow rate ussing a derated
kW use the formula:

____ kW x 6.824 ÷ ____ °FΔT = ____ GPM

°FΔT = Change in Temperature (Hot - Cold)