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Which Tankless Water Heater is Right for Me?

Hubbell 200 Series

The Hubbell 200 series Tankless electric water heater offers 3 element heating and is perfect for homes in the northern part of the country.

Three Models to choose from
Model 280-3 27 kW

Model 280-3
Model 240-3 24 kW

Model 240-3
Model 220-3 21 kW

Model 220-3
     
     
Dimensions: 17" x 16" x 3"
Weight: 23 lbs

Hubbell 100 Series

The Hubbell 100 series Tankless electric water heater offers 2 element heating and is perfect for homes in the southern part of the country.

Four Models to choose from
Model 180-2 18 kW

Model 180-2
Model 165-2 16 kW

Model 165-2
Model 145-2 14 kW

Model 145-2
Model 110-2 11 kW

Model 110-2
   
Dimensions: 13.5" x 16" x 3"
Weight: 19 lbs.

Minimum Recommended Model Average Cold Water Temp.
  Winter Summer

Model 280-3

 Model 280-3 27kW 37 °F 50 °F

Model 240-3

 Model 240-3 24 kW 40 °F 52 °F

Model 220-3

 Model 220-3 21 kW 50 °F 61 °F

Model 180-2

 Model 180-2 18 kW 62 °F 75 °F

Model 165-2

 Model 165-2 16 kW 65 °F 77 °F

Model 145-2

 Model 145-2 14 kW 65 °F 77 °F

Model 110-2

 Model 110-2 11 kW 65 °F 77 °F

Flow Rate Chart

Determine the flow rate (GPM) of 105°F (40°C) Hot Water provided by the Hubbell Tankless Electric Water Heater. Based upon 240V

Cold Water
Inlet Temp		 110-2 145-2 165-2 180-2 220-3 240-3 280-3
11 kW 14 kW 16 kW 18 kW 21 kW 24 kW 27 kW
40°F (4°C) 1.2 1.5 1.7 1.9 2.2 2.5 2.8
45°F (7°C) 1.3 1.6 1.8 2.0 2.4 2.7 3.1
50°F (10°C) 1.4 1.7 2.0 2.2 2.6 3.0 3.3
55°F (13°C) 1.5 1.9 2.2 2.5 2.9 3.3 3.7
60°F (15°C) 1.7 2.1 2.4 2.7 3.2 3.6 4.1
65°F (18°C) 1.9 2.4 2.7 3.1 3.6 4.1 4.6
70°F (21°C) 2.1 2.7 3.1 3.5 4.1 4.7 5.3
75°F (24°C) 2.5 3.2 3.6 4.1 4.8 5.5 6.1
80°F (27°C) 3.0 3.8 4.4 4.9 5.7 6.6 7.4
85°F (29°C) 3.8 4.8 5.5 6.1 7.2 8.2 9.2
90°F (32°C) 5.0 6.4 7.3 8.2 9.6 10.9 12.3

Typical Hot Water Flow Rates

GPM (Gallons per Minute Calculation Chart)

  • Dishwasher
  • 0.5 - 1.0 GPM
  • Bathroom Sink
  • 0.5 - 1.5 GPM
  • Kitchen Sink
  • 1.5 - 2.0 GPM
  • Utility Sink
  • 1.5 - 2.0 GPM
  • Washing Machine
  • 2.0 - 2.5 GPM
  • Shower*
  • 1.5 - 2.5 GPM
  • Bath Tub
  • 2.5 - 4.0 GPM

*If simultaneous operation of multiple showers is absolutely necessary, two units may be needed. Installation of two units will likely require electrical service upgrade to the home.

Sizing Formula for Average Household Example
Total Fixture
Flow Rate
(GPM)		 x Residential
Demand Factor
(0.30)		 = Instantaneous
Demand
(GPM)
Dishwasher 1 x 0.5 = 0.5
Washing Machine 1 x 2.0 = 2.0
Bathroom Sink 2 x 0.5 = 1.0
Kitchen Sink 1 x 1.5 = 1.5
Shower 2 x 2.0 = 4.0
  Total = 9.0

Model Selections:

At 40°F cold water and 2.7 GPM select Model 280-3
At 70°F cold water and 2.7 GPM select Model 145-2

9.0 x 0.30 = 2.7 GPM