Electric Tankless Water Heater Comparisons

Electric Models

Provides Hot Water For (1)

Wire Size

Hard Wiring

Volts

Amps

Water Connection

GPM @ 110F (Shower Temp)

Limited Warranty

Notes

Ariston GL 2.5

1 minor application

Plug-in

No

120

12.5

½” NPT

N/A

6 years

Mini-tank stores 2.5 Gal hot water.  Only mini-tanks can be installed in-line with existing hot water heater.

Ariston GL4

1 minor application

Plug-in

No

120

12.5

½” NPT

N/A

6 years

Mini-tank stores 4 Gal hot water.  Only mini-tanks can be installed in-line with existing hot water heater.

Ariston GL6 Plus

2+ minor applications

12 GA

Yes

120

12.5

¾” NPT

N/A

6 years

Mini-tank stores 6 Gal hot water.  Only mini-tanks can be installed in-line with existing hot water heater.

PowerStar AE115

1 major application

8 GA

Yes

240-208v

80

¾” NPT

2

10 years

This unit is not recommended where the average ground temp is less than 60F. Requires 2 separate 40 amp breakers. No venting requirements.

PowerStar AE125

1 major application

8 GA

Yes

240-208v

120

¾” NPT

3.5

10 years

Neither PowerStar model can be installed in-line with an existing hot water heater. AE125 requires 3 separate 40 amp breakers. No venting requirements.