Aquastar (by Bosch) is a leader in the tankless water heater industry, providing tankless water heating for a variety of applications. If you are replacing your existing water heater, why not go tankless? The benefits will be noticed the very first time you use it, and you'll wonder why you waited so long to go tankless! Looking for more Bosch products? Click
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The Bosch Aquastar's flow-through, tankless design means that your water is heated instantly - but only for as long as you need the hot water, unlike tank water heaters which have to constantly maintain a desired hot water temperature whether or not you are using it. This translates directly into energy and cost savings. In addition, the Aquastar's compact design saves space and makes it a one-person installation job. All water components are made of solid copper, and the heaters are constructed from stainless steel and aluminum. There is virtually no mineral buildup since the unit does not store water. These models have some of the highest efficiency ratings and best energy factors on the market.
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. It's 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:
Water related specifications :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
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Bosch Pro Tankless Water Heater Model 425 EF
Water related specifications :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
Save money and get a quick price quote ... it only takes a minute and is well worth it!!! Unlike most other products, we cannot show our low pricing on the web for these items. (click here to find out why)
To request a price quote, simply select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product.
Pro Tankless Water Heater by Bosch Model 425 PN
Water related specifications :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
Save money and get a quick price quote ... it only takes a minute and is well worth it!!! Unlike most other products, we cannot show our low pricing on the web for these items. (click here to find out why)
To request a price quote, simply select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product.
Pro Tankless Water Heaters Models 345 ESR and 450 ESR
Specifications for these water heaters :Adjustable water temperature range : 115°F - 190 °FGas 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 Gas Type Rated Gas Input Max Output Minimum Output 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
Flexible Corrugated Stainless Steel Water Connector - 3/4" FIP x 3/4" FIP - 18" Long
Flexible Corrugated Stainless Steel Water Connector - 3/4" FIP x 3/4" FIP - 24" Long
Flexible Corrugated Copper / Stainless Steel Water Connector - 3/4" FIP x 3/4" Nom Sweat - 18" Long
Flexible Corrugated Copper / Stainless Steel Water Connector - 3/4" FIP x 3/4" Nom Sweat - 24" Long
Save money and get a quick price quote ... it only takes a minute and is well worth it!!! Unlike most other products, we cannot show our low pricing on the web for these items. (click here to find out why)
To request a price quote, simply select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product.
Bosch Pro Tankless Water Heater Model 715 ESR
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 :
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:
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.
Save money and get a quick price quote ... it only takes a minute and is well worth it!!! Unlike most other products, we cannot show our low pricing on the web for these items. (click here to find out why)
To request a price quote, simply select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product.
Pro Tankless Water Heaters By Bosch Model C 800 ES
Water related specifications :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.
Comparison Chart
Model 260 PN 425 HN 425 EF 425 HNO 425 PN
Capacity
45°F rise at 2.6 gpm
45°F rise at 4.2GPM
45°F rise at 4.6GPM
45°F rise at 4.2 GPM
45°F rise at 4.2GPM
Power Input (Btu/hr) 30,735 - 74 900 28,000 - 117,000 LP: 28,000-125,000 28,000-117,000 31,000-117,000
Thermal Efficiency 78% 80% LP: 82% 80% 78%
Energy Factor .64 .8 LP: 0.81 NG: 0.80 NG: 0.69
Dimensional Drawings Dimensions Dimensions Dimensions Dimensions Dimensions
Weight (lbs) 26 40 44 57 35
Model 345 ESR 450 ESR 715 ESR C 800 ES
Capacity 45°F rise at 3.5 GPM 45°F rise at 4.5 GPM
45°F rise at 7.2GPM
45°F rise at 8.0GPM
Power Input (Btu/hr) 95,000 (maximum) 120,000 (maximum) 19,900 - 199,000 199,000 (maximum)
Thermal Efficiency 82% 81% 82% 92%
Energy Factor 82% 81%
LP: 0.82
LP: 0.90
Dimensional Drawings Dimensions Dimensions Dimensions Dimensions
Weight (lbs) 47 47 67 74
Need a higher flow rate? Click here for Takagi tankless water heaters
Looking for parts for your Aquastar/Bosch ?
Note: if you're replacing multiple water heaters (old tank style),water heater drain pump to reduce labor by quickly/easily removing the water.
Help save our environment by saving energy. Think Tankless!
You will never run out of hot water. "You want an hour long shower? No problem!"
