Knowledge Base

Bosch Therm Tankless Water Heaters

We carry the complete line of Bosch Therm Tankless Water Heaters through our Pro Water Heater Supply Division. This wholesale line of tankless water heaters was previously called the Bosch Pro Series of tankless water heaters.

The Bosch Therm tankless water heaters can only be purchased by licensed installers. If you are a home owner we cannot sell you the Bosch Therm tankless water heaters. Please have your professional installer call us at 866.289.4652.

The Bosch Therm Applications Manual details how the Bosch Pro line of tankless water heaters can be used in various Commercial and Residential applications.

The following Bosch Therm Tankless Water Heaters are available for Commercial applications:

Bosch Therm C 1210ESC (formerly the Bosch Pro 920ESC)

• 225,000 BTUs with Condensing Heat Exchanger
• Up to 98% Thermal Efficiency
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with PVC
• Delivers up to 180 Deg F Water
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 5 Year Heat Exchanger Warranty/ 5 Years on Parts
• 2 Year Warranty on recirculating applications

Bosch Therm C 1050ES (formerly the Bosch Pro 800ES)

• 199,000 BTUs with Condensing Heat Exchanger
• 92% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with PVC
• Delivers up to 140 Deg F Water
• Up to 184 Deg F with High Temp Kit
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 940ES (formerly the Bosch Pro 715ES)

• 199,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 140 Deg F Water
• Up to 184 Deg F with High Temp Kit
• Intelligent Cascading Up to 24 Units
• Indoor Installation
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 940ESO Outdoor (formerly the Bosch Pro 715ES + PTOK Kit)

• 199,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Delivers up to 140 Deg F Water
• Up to 184 Deg F with High Temp Kit
• Intelligent Cascading Up to 24 Units
• Outdoor Installation
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 830ES

• 175,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 140 Deg F Water
• Up to 184 Deg F with High Temp Kit
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 660EF

• 140,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 160 Deg F Water
• Ability to Cascade Up to 24 Units
• Indoor Installation
• Built-in Freeze Protection
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 660EFO Outdoor

• 140,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 160 Deg F Water
• Ability to Cascade Up to 24 Units
• Outdoor Installation
• Built-in Freeze Protection
• 2 Year Heat Exchanger Warranty/ 5 Years on Parts

For the full details you can review the Bosch Therm Commercial Tankless Water Heater Product Selection Guide

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The following Bosch Therm Tankless Water Heaters are available for Residential applications:

Bosch Therm C 1210ES (formerly the Bosch Pro 920ES)

• 225,000 BTUs with Condensing Heat Exchanger
• Up to 98% Thermal Efficiency
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with PVC
• Delivers up to 140 Deg F Water
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts
• 2 Year Warranty on recirculating applications

Bosch Therm C 1050ES (formerly the Bosch Pro 800ES)

• 199,000 BTUs with Condensing Heat Exchanger
• 92% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with PVC
• Delivers up to 140 Deg F Water
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 940ES (formerly the Bosch Pro 715ES)

• 199,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 140 Deg F Water
• Intelligent Cascading Up to 24 Units
• Indoor Installation
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 940ESO Outdoor (formerly the Bosch Pro 715ES + PTOK Kit)

• 199,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Delivers up to 140 Deg F Water
• Intelligent Cascading Up to 24 Units
• Outdoor Installation
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 830ES

• 175,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 140 Deg F Water
• Intelligent Cascading Up to 24 Units
• Outdoor Installation Using Optional Kit
• Built-in Freeze Protection
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 660EF

• 140,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 160 Deg F Water
• Indoor Installation
• Built-in Freeze Protection
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 660EFO Outdoor

• 140,000 BTUs
• 83% Thermal Efficiency
• Energy Star
• Eligible for the 2010 30% Federal Tax Credit
• Available in Natural Gas and Propane models
• Electronic Ignition
• Vents Vertically or Horizontally with Stainless Steel
• Delivers up to 160 Deg F Water
• Outdoor Installation
• Built-in Freeze Protection
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 520HN (formerly the Bosch Pro 425HN)

• 117,000 BTUs
• 80% Thermal Efficiency
• Available in Natural Gas and Propane models
• Patented Hydro Ignition
• Vents Vertically or Horizontally with B-Vent
• AQ4 Vent Kit Needed for Horizontal Venting
• Adjustable Temperature Range
• Indoor Installation
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 520PN (formerly the Bosch Pro 425PN)

• 117,000 BTUs
• 78% Thermal Efficiency
• Available in Natural Gas and Propane models
• Pilot Light Ignition
• Vents Vertically or Horizontally with B-Vent
• AQ4 Vent Kit Needed for Horizontal Venting
• Adjustable Temperature Range
• Indoor Installation
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

Bosch Therm 330PN (formerly the Bosch Pro 260PN)

• 74,900 BTUs
• 78% Thermal Efficiency
• Available in Natural Gas and Propane models
• Pilot Light Ignition
• Vents Vertically with B-Vent
• Adjustable Temperature Range
• Indoor Installation
• 15 Year Heat Exchanger Warranty/ 5 Years on Parts

For the full details you can review the Bosch Therm Residential Tankless Water Heater Product Selection Guide

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The Bosch Pro line of electric tankless water heaters and electric mini-tank water heaters can be used in both Commercial and Residential applications.

PowerStream Pro RP27PT

• Whole House Electric Tankless Water Heater
• 27kW
• 97% Efficiency
• 3 x 40AMPS @240V
• Requires Hard Wiring
• 10 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP17PT

• Whole House Electric Tankless Water Heater
• 17kW
• 97% Efficiency
• 2 x 40AMPS @240V
• Requires Hard Wiring
• 10 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP12PT

• Point-of-Use Electric Tankless Water Heater
• 12kW
• 99% Efficiency
• 1 x 50AMPS @240V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP9P

• Point-of-Use Electric Tankless Water Heater
• 9.5kW
• 99% Efficiency
• 1 x 35AMPS @277V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP1P

• Point-of-Use Electric Tankless Water Heater
• 9.5kW
• 99% Efficiency
• 1 x 40AMPS @240V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP7P

• Point-of-Use Electric Tankless Water Heater
• 7.2kW
• 99% Efficiency
• 1 x 30AMPS @240V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP2P

• Point-of-Use Electric Tankless Water Heater
• 6kW
• 99% Efficiency
• 1 x 25AMPS @277V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

PowerStream Pro RP3P

• Point-of-Use Electric Tankless Water Heater
• 3.4kW
• 99% Efficiency
• 1 x 30AMPS @110V
• Requires Hard Wiring
• 5 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

Ariston Pro Ti GL8Ti

• Point-of-Use Electric Mini-tank Water Heater
• 7 Gallon Capacity
• 98% Efficiency
• 1 x 12.5AMPS @120V
• 1500 Watts Heating Capacity
• Plugs into Standard Outlet
• 8 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

Ariston Pro Ti GL4Ti

• Point-of-Use Electric Mini-tank Water Heater
• 3.85 Gallon Capacity
• 98% Efficiency
• 1 x 12.5AMPS @120V
• 1500 Watts Heating Capacity
• Plugs into Standard Outlet
• 8 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use

Ariston Pro Ti GL2.5Ti

• Point-of-Use Electric Mini-tank Water Heater
• 2.75 Gallon Capacity
• 98% Efficiency
• 1 x 12.5AMPS @120V
• 1500 Watts Heating Capacity
• Plugs into Standard Outlet
• 8 Year Heat Exchanger Warranty/ 1 Years on Parts
• 2 Year Warranty for Commercial Use