Bosch Pro Tankless Water Heater Model 260 PN
This small gas tankless water heater is ideal for cottages, camps, and other specific applications where a small volume of hot water is desired. Its compact size means you save valuable floor space and is available in both natural gas (NG) and liquid propane (LP)
This Pro Tankless water heater features: Gas related specifications: Maximum output: 58,400 Btu/hr Power input: 30,735 - 74,900 Btu/hr Thermal efficiency: 78% Minimum output: 23,906 Btu/hr Gas connection: 1/2" male NPT Inlet gas pressure under maximum operation: • Propane gas: 10.5" - 14" water column • Natural gas: 5.7" - 14" water column	Water related specifications: 45°F rise at 2.6 gpm 55°F rise at 2.1 gpm 65°F rise at 1.7 gpm 77°F rise at 1.5 gpm 90°F rise at 1.3 gpm Hot water connection: 1/2" male NPT Cold water connection: 1/2" male NPT Minimum water flow: 0.5 GPM Water pressure: 30 - 150 psi Connections at bottom of heater Water resistant Venting: Vent diameter: 4" Minimum height: 6' (with no elbows) Vertical termination Natural draft Safety devices: Flame failure device Pressure relief valve Over heat prevention Standing pilot ignition Weight: 26 pounds Click here for dimensional drawing and clearance diagrams

Model #	Description	Select Item(s)
GWH-260-PN-N	Pro Tankless Water Heater - Natural Gas
GWH-260-PN-L	Pro Tankless Water Heater - Propane
40463	Accessory: Isolation Water Valves - Set of 2

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Bosch Pro Tankless Water Heater 425 HN
The Bosch engineers have proven that water can indeed make fire. The pilot is ignited by a super-concentrated spark generated by a micro-turbine. The micro-turbine is activated by a request for hot water in the house. This energy efficient technology makes the 425 HN ideal for households looking to maximize energy savings
Water related specifications: 45°F rise at 4.2GPM 55°F rise at 3.4GPM 65°F rise at 2.9GPM 77°F rise at 2.4GPM 90°F rise at 2.1GPM Water connection: 1/2" male NPT Water pressure: 18 psi at 4 GPM Max. water pressure: 150 psi Minimum flow rate .5 GPM	Gas/power related specifications: Gas input: 28,000 Btu/hr - 117,000 Btu/hr Gas connection 3/4" male NPT Inlet gas pressure under maximum operation: Natural gas: 5.7" - 14" water column Liquid propane: 10.5" - 14" water column Thermal efficiency: 80% This Pro Tankless water heater features: Safety flame sensor at pilot burner Automatic overheating protection shut-off sensor Electronic pilot ignition driven by hydro-generator - helps save electricity Compact space saver: mounts on a wall with two hooks Adjustable water flow restrictor to ensure that water flow demand will not exceed the heating capacity of the heater On/off switch to activate system makes the water heater easy to use Red LED indicator flashes with low water pressure Green LED indicator main burner operation Weight 40 LB Vent 5" (double-wall type B) Click here for dimensions and installation clearance Warning: Do not mount heater directly onto vinyl siding. A 6' x 4' area of vinyl siding must first be covered or replaced with wood or other non-plastic material. Heat shield is included for mounting on combustible surfaces other than vinyl siding.

Model #	Description	Select Item(s)
GWH-425-HN-N	Pro Tankless Water Heater - Natural Gas
GWH-425-HN-L	Pro Tankless Water Heater - Propane Gas
40463	Accessory: Isolation Water Valves - Set of 2
AQ1	Accessory: Power Vent with Back Draft Damper

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Bosch Pro Tankless Water Heater Model 425 EF

Water related specifications: 45°F rise at 4.6GPM 55°F rise at 3.8GPM 65°F rise at 3.3GPM 77°F rise at 2.7GPM 90°F rise at 2.3GPM Water connection: 1/2" male NPT Water pressure: 18psi-150psi Minimum flow rate: .5GPM

This tankless water heater features: The 425 EF has all the durability and performance of the 425 HN, with an added bonus - a built-in power vent. This makes the unit ideally suited for households requiring horizontal, through-the-wall venting only On/off switch to activate system - makes the tankless water heater easy to use Pressure relief valve included Power venting with safety shutoff Safety flame sensor at pilot burner Automatic overheating protection shut-off sensor Built-in corrosion resistant power vent Adjustable water flow restrictor to ensure that water flow demand will not exceed the heating capacity of the heater Electric ignition 4" Vent Weight: 44lbs. Gas/power related specifications: Gas connection: 1/2" male NPT NG gas pressure: 7-14" WC LG gas pressure: 11-14" WC Electric supply: 120 Volts, 1.2 Amps (plug-in) Click here for dimensional drawing and minimum clearance diagram

Model #	Description	Power Input	Energy Factor	Thermal Efficiency	Select Item(s)
GWH-425-EF-L	Pro Tankless Water Heater - Propane	28,000-125,000Btu	81%	82%
GWH-425-EF-N	Pro Tankless Water Heater - Natural Gas	28,000-130,000Btu	78%	80%
40463	Accessory: Isolation Water Valves - Set of 2	-	-	-

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Pro Tankless Hot Water Heater by Bosch 425 HNO - Designed for Outdoor Installation

Water related specifications: 45°F rise at 4.2 GPM 55°F rise at 3.4 GPM 65°F rise at 2.9 GPM 77°F rise at 2.4 GPM 90°F rise at 2.1 GPM Hot water connection: 1/2" male NPT Cold water connection: 1/2" male NPT Water pressure: 30-150psi Gas/heat related specifications: Gas connection: 3/4" NG gas pressure: 7" - 14" WC LP gas pressure: 11" - 14" WC Min. output: 28,000 Btu/h Maximum output: 101,772 Btu/h Maximum input: 117,000 Btu/h Efficiency: 80%

This hot water heater features: The Bosch ProTankless GWH 425 HNO incorporates the same revolutionary hydro-generated ignition system as the GWH 425 HN, allowing the water heater to operate without a standing pilot, electricity, or a battery. However, the Bosch ProTankless GWH 425 HNO is designed to be installed outside and has built-in freeze protection to 5°F. Built-in corrosion resistant draft diverter - helps your water heater last longer Adjustable water flow restrictor to ensure that water flow demand will not exceed the heating capacity of the heater Flame failure device Safety flame sensor at pilot burner Automatic overheating protection shut-off sensor Copper heating coils for endless supply of hot water Electronic pilot ignition driven by hydro-generator Electrical supply 120 VAC for freeze protection (plug-in) Outdoor installation - No venting required Pressure relief valve Click here for dimensional drawing and minimum clearance diagram

Model #	Description	Select Item(s)
GWH-425-HNO-L	Pro Tankless Water Heater - Propane Gas
GWH-425-HNO-N	Pro Tankless Water Heater - Natural Gas
40463	Accessory: Isolation Water Valves - Set of 2

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Pro Tankless Water Heater by Bosch Model 425 PN

Water related specifications: 45°F rise at 4.2GPM 55°F rise at 3.4 GPM 65°F rise at 2.9 GPM 77°F rise at 2.4 GPM 90°F rise at 2.1 GPM Water connections: 1/2" male NPT Minimum flow rate: 0.5 GPM Minimum recommended water pressure: 30 psi Connections at bottom of heater

This tankless water heater features: Efficient modern day tankless water heater provides instant hot water and doesn't waste energy when you don't need hot water Flame failure device Pressure relief valve Over heat prevention - to help make you water heater last Water resistant - helps make water heater more durable Weight: 35lbs Gas/power related specifications: Gas connection: 3/4" male NPT Inlet gas pressure under maximum operation: Propane: 10.5" - 14" water column Natural gas: 5.7" - 14" water column Maximum output: 91,525 Btu/hr Maximum input: 117,000 Btu/hr Thermal efficiency: 78% Min. output: 23,906 Btu/hr Venting: Vent diameter: 5" Minimum height 6' (with no elbows) Vertical termination Click here for dimensional drawing and minimum clearance diagram

Model #	Description	Select Item(s)
GWH-425-PN-L	Pro Tankless Water Heater - Propane Gas
GWH-425-PN-N	Pro Tankless Water Heater - Natural Gas
40463	Accessory: Isolation Water Valves - Set of 2

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Pro Tankless Water Heaters Models 345 ESR and 450 ESR
Specifications for these water heaters: 3.5 GPM at 45°F rise for model 345 4.5 GPM at 45°F rise for model 450 Adjustable water temperature range: 115°F - 190 °F Gas connection: 3/4" male NPT NG gas pressure 5.5 - 8" WC LP gas pressure 11-14" WC Water connections: 3/4" male NPT Vents vertically or horizontally with 3" stainless steel Direct vent and sealed combustion Maximum exhaust vent length: 39' (with one elbow) Exhaust vent size: 3" Intake vent size: 3" Click for water pressure vs GPM chart	Features for these water heaters: LCD screen displays temperatures, burner operation, and diagnostic codes Separate temperature controls for domestic water heating and recirculation Reset button Flame failure device Overheat prevention (temperature limiter) Pressure switch (blocked vent protection) Freeze prevention cycle - helps your hot water heater last longer Pressure relief valve Modulating gas valve Noise is less than 50 db Compact space saver: mounts on a wall with supplied bracket Electric ignition Electric supply 120 VAC - plugs in Weight: 47lbs Click here for dimensional drawing and installation clearance diagram

Model #	Max Flow Rate with a 45°F Rise	Gas Type	Rated Efficiency	Gas Input (BTU/Hr)	Max Output (BTU/Hr)	Minimum Output (BTU/Hr)	Select Item(s)
GWH-345-ESR-N	3.5	Natural Gas	82%	95,000	77,900	23,900
GWH-345-ESR-L	3.5	Propane	82%	95,000	77,900	23,900
GWH-450-ESR-N	4.5	Natural Gas	81%	120,000	98,400	35,500
GWH-450-ESR-L	4.5	Propane	81%	120,000	98,400	35,500
Model	Description						Select Item(s)
9620LA	Isolation Valve Kit

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Pro Tankless 635 ES
Gas/power related specifications: Power Input • NG: 35,000-175,000 Btu • LP: 31,000-175,000 Btu Gas connection: 3/4" male NPT NG gas pressure: 5"WC - 14"WC LP gas pressure: 11"WC - 14"WC Output: 31,131 Btu/h - 142,968 Btu/h Energy Factor: • NG: .85 • LP: .86 Thermal Efficiency: • NG: 87% • LP: 86% 120 VAC 6 ft power supply cord Amperage: 40 mA (idle) - 2.5 Amps (during operation)	Water related specifications: 45°F rise at 6.4GPM 55°F rise at 5.2GPM 65°F rise at 4.5GPM 77°F rise at 3.7GPM 90°F rise at 3.2GPM Minimum flow: .8GPM Water connections: 3/4" male NPT Water pressure: 30 psi - 150psi Controls: Touch pad interface control LCD Display On/off and temperature control switches Reset button Programmable temperature range 100°F - 140°F (default 122°F) Failure codes for easy diagnostics and repair Diagnostic mode for troubleshooting and informational purposes Safety features: Flame sensor Overheat sensor Temperature limiter Fan speed monitoring Pressure relief valve Vent size: 3" stainless steel High power pre-mix compact burner with low NOx emissions Modulating gas valve with constant gas to air ratio control Modulating water valve for improved comfort and temperature control Compact space saver: mounts on a wall with a supplied bracket Connections at bottom of water heater Electronic Ignition Noise: less than 50db Weight 47lbs Click here for dimensional drawing and clearance diagram
Note: this water heater is not designed for mobile homes (or any mobile installation), recirculation/pumping applications, solar/preheat backup, or for high temperature booster use.

Model #	Description	Select Item(s)
GWH-635-ES-L	Pro Tankless Water Heater - Propane
GWH-635-ES-N	Pro Tankless Water Heater - Natural Gas
9620LA	Isolation Valve Kit

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Bosch Pro Tankless Water Heater Model 635 ESO - Designed for Outdoor Use
Water related specifications: 45°F rise at 6.4gpm 55°F rise at 5.2gpm 65°F rise at 4.5gpm 77°F rise at 3.7gpm 90°F rise at 3.2gpm Water connections: 3/4" male NPT Minimum flow rate: .8 GPM Water pressure: 30 - 150 PSI Safety features: Overheat sensor Pressure relief valve Flame sensor Temperature limiter Fan speed monitoring Built-in freeze protection to 5°F	Gas/power related specifications: Power input: 31,131 - 175,000 BTU Gas connection 3/4" male NPT Gas pressure: • NG 5"WC - 14"WC • LP: 11"WC - 14" WC Energy factor: • NG: .85 • LP: .86 Thermal efficiency: • NG: 87% • LP: 86% Controls: Touch pad interface control Built-in temperature controls - range: 100°F - 140°F (default 122°F) High power pre-mix compact burner with low NOx emissions Modulating Gas Valve with constant gas: air ratio control Modulating water valve for improved comfort and temperature control Wall mounting bracket included Amperage: 40mA (idle) - 2.5A (during operation) 120V plug-in cord Electronic ignition Connections at bottom of heater Outdoor installation - no venting required Noise: 50 db Weight: 47lbs Click here for dimensional drawing and minimum clearance diagram
Note: this water heater is not designed for mobile installations (RV's, boats, etc), recirculation, solar/preheat backup, or high temperature booster use.

Model #	Description	Select Item(s)
GWH-635-ESO-L	Outdoor Pro Tankless Water Heater - Propane
GWH-635-ESO-N	Outdoor Pro Tankless Water Heater - Natural Gas
9620LA	Isolation Valve Kit

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Bosch Pro Tankless Water Heater Model 715 ES
	This tankless water heater features: 82% Thermal efficiency Vents vertically or horizontally with 3" stainless steel Can be used with multiple units for increased flow rates High power pre-mix compact burner with low NOx emissions - good for the environment Modulating water valve for improved temperature control Compact space saver - mounts on a wall with a supplied bracket Vent size: 3" or 4" stainless steel Connections at bottom of water heater Electronic ignition Electrical supply: 120V (plug-in) Amperage: 40mA (idle) - 2.5A (during operation) Noise: 45 - 65 db Weight: 67 lbs Controls Key pad interface control - for ease of use LCD display with back light On/off and temperature control switches with selection range: 100°F - 140°F Default temperature 122°F Reset button Program button (allows you to set the temperature) Real-time diagnostics for troubleshooting and informational purposes Safety features: Flame failure device Pressure relief valve Over heat prevention Inlet temperature sensor Outlet temperature sensor Click here for dimensional drawing and minimum clearance diagram
Specifications for this tankless water heater: Water related specifications: 45 °F rise at 7.2GPM 55 °F rise at 5.9GPM 65 °F rise at 5.0GPM 77 °F rise at 4.2GPM 90 °F rise at 3.6GPM Minimum flow rate: .65 GPM (can be up to 1.6GPM depending on water temperature) Max flow rate: 7.3GPM Water pressure 30 psi - 150 psi Water connections: 3/4" male NPT Gas related specifications: Maximum output: 160,500 Btu/h Input: 19,900 Btu/h - 199,000 Btu/h Inlet gas pressure under operation: • Propane: 9" - 14" water column • Natural Gas: 4" - 14" water column Gas connection: 3/4" male NPT NG gas pressure: 4"WC - 14"WC LP gas pressure 9"WC - 14"WC Modulating gas valve firing rate: 19,000BTU/hr - 199,00BTU/hr
Important Note: these water heaters are not designed for use above 4,500ft (above sea level) altitude, in mobile installations, or for space heating purposes. Outdoor installation requires an outdoor kit (PTOK). Also, if the inlet water temperature is higher than 140°F, then a 3-way valve or mixing valve must be installed.

Model #	Energy Factor	Description	Select Item(s)
GWH-715-ES-LP	.82	Pro Tankless Water Heater - Propane
GWH-715-ES-NG	.81	Pro Tankless Water Heater - Natural Gas
PTOK	-	Outdoor Installation Kit
9620LA	-	Isolation Valve Kit

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Pro Tankless Water Heaters By Bosch Model C 800 ES
Water related specifications: 35°F rise at 10.1GPM 45°F rise at 8.0GPM 55°F rise at 6.4GPM 65°F rise at 5.5GPM 77°F rise at 4.6GPM 90°F rise at 3.9GPM Water connections: 3/4" male NPT Minimum water flow: 0.65 GPM (can be up to 1.6GPM depending on water temperature) Minimum water pressure: 30 psi Gas/power related specifications: Maximum output: 179,300 Btu/h Input: 19,900 Btu/h - 199,000 Btu/h Gas connection: 3/4" male NPT Inlet gas pressure under operation (with a high hot water flow rate): Propane: 9" - 14" water column Natural Gas: 4" - 14" water column Amperage: 40 mA (idle) - 65A (operation)	This tankless water heater features: 92% Thermal efficiency Vents vertically or horizontally with 3" PVC, CPVC, or ABS-DWV Ability to cascade units for increased flow rates High power pre-mix compact burner with low NOx emissions - good for the environment Modulating water valve for improved temperature control Noise: 45 - 65 db Connections at bottom of heater Weight: 74lbs Controls LCD display with back light On/off and temperature control switches Reset button Program button - allows you to set the temperature between the range: 100°F - 140°F Default temperature: 122°F Real-time diagnostics for troubleshooting/informational purposes Safety devices Flame failure device Pressure relief valve Over heat prevention Inlet temperature sensor Outlet temperature sensor Back flow temperature sensor Exhaust gas temperature sensor Click here for dimensions and minimum clearance diagram
Important Note: these water heaters are not designed for use above 4,500ft A.S.L. altitude, in mobile installations, or for space heating purposes. Outdoor installation requires an outdoor kit (PTOK). Also, if the inlet water temperature is higher than 140°F, then a 3-way valve or mixing valve must be installed.

Model #	Description	Select Item(s)
GWH-C-800-ES-LP	Pro Tankless Water Heater - Propane
GWH-C-800-ES-NG	Pro Tankless Water Heater - Natural Gas
PTOK	Outdoor Installation Kit
9620LA	Isolation Valve Kit