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Electric Tankless Water Heater Comparison

Tankless Model Heating Power The Lowdown

Bosch AE125 Tankless Water Heater
Heating Capacity: 1 Shower

  • 80° F rise @ 2.3 gpm
  • 70° F rise @ 2.6 gpm
  • 60° F rise @ 3.0 gpm
  • 50° F rise @ 3.7 gpm
  • 45° F rise @ 4.0 gpm
The Bosch AE125 is the most powerful electric tankless unit made by Bosch. It can heat one shower or two sinks simultaneously. Other features include:
  • No venting required
  • 95% efficiency rating
  • Requires 200 amps of power
  • 10 Year Warranty

Stiebel  TEMPRA 36 Tankless Water Heater
Heating Capacity: 2 Showers

  • 80° F rise @ 3.25 gpm
  • 70° F rise @ 3.50 gpm
  • 60° F rise @ 4.20 gpm
  • 55° F rise @ 4.50 gpm
  • 40° F rise @ 6.10 gpm
The Stiebel TEMPRA36 is the most powerful electric tankless unit we offer It can heat up to 2 showers. Other features include:
  • No venting required
  • 3 year warranty
  • Requires 300 amps of power
  • German Engineered

Stiebel TEMPRA 29 Tankless Water Heater
Heating Capacity: 1 Shower

  • 80° F rise @ 2.4 gpm
  • 70° F rise @ 2.65 gpm
  • 60° F rise @ 3.25 gpm
  • 55° F rise @ 3.60 gpm
  • 40° F rise @ 4.75 gpm
The Stiebel TEMPRA29 whole house tankless unit can power 1 shower and one sink. Other features include:
  • No venting required
  • 3 year warranty
  • Requires 200 amps of power
  • German engineered

Bosch AE115 Tankless Water Heater
Heating Capacity: 1 Shower

  • 80° F rise / 1.5 gpm
  • 70° F rise / 1.7 gpm
  • 60° F rise / 1.9 gpm
  • 50° F rise / 2.3 gpm
  • 45° F rise / 2.6 gpm
The Bosch AE115 is the 2nd whole house tankless water heater offered by Bosch. It can power one shower in most warm climate applications. It is not recommended to power showers in colder climates.
  • No Venting Required
  • Requires 150 amps of power
  • 10 Year Warranty

Bosch PowerStar Point of use tankless water heaters Models: AE3.4, AE7.2, AE9.5
Heating Capacity: 1 Sink

AE3.4 - 40° F rise @ 0.5 gpm; 28° F rise @ 0.75 gpm; 20° F rise @ 1.0 gpm
AE7.3 - 96° F rise @ 0.5 gpm; 63° F rise @ 0.75 gpm; 48° F rise @ 1.0 gpm; 32° F rise @ 1.5 gpm; 24° F rise @ 2.0 gpm
AE9.5 - 84° F rise @ 0.75 gpm; 64° F rise @ 1.0 gpm; 42° F rise @ 1.5 gpm; 32° F rise @ 2.0 gpm
The Bosch Powerstar AE3.4 - AE 9.5 point of use tankless water heaters are ideal for smaller applications such as sinks. They are not able to accept preheated water and must be hard wired during installation.
  • 5 Year Warranty
  • Installs Vertically or Horizontally.
  • 99% Efficient
  • AE 3.4 - 120V; AE7.3, 9.5 - 240V

Bosch AE12 Point of use tankless water heater
Heating Capacity: 1 Sink

  • 72° F rise @ 0.5 gpm
  • 72° F rise @ 0.75 gpm
  • 72° F rise @ 1.0 gpm
  • 52° F rise @ 1.5 gpm
  • 42° F rise @ 2.0 gpm
The Bosch AE12 Point of use tankless water heater is ideal or smaller applications such as sinks. It is not able to accept pre heated water and must be hard wired.
  • 240 Volts; 50 Amps
  • 99% Efficient
  • Can only be installed horizontally
  • 5 Year Warranty

Ariston Point of use tankless water heaters: GL25, GL4, GL6
Heating Capacity: 1 Sink
 
GL25
- Recovery @ 90 degree rise: 7 gph; 2.75 gallon tank
GL4 - Recovery @ 90 degree rise: 7 gph; 3.85 gallon tank
GL6 - Recovery @ 90 degree rise: 7 gph; 6 gallon tank
The Ariston point of use tankless water heaters are a compact and handy way to heat a small application such as a sink. They are able to plug in to a standard 110V outlet and can accept a pre heated water line.
  • 45 - 145 degree heating
  • 6 Year Warranty
  • Mounts on wall or floor

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