Bosch Tankless Gas Water Heaters

Bosch Therm 830 ES Tankless Water Heaters

An excellent tankless solution for busy residential household applications as well as commercial uses. This modern day tankless water heater provides instant hot water and doesn't waste energy when you don't need hot water.

Bosch 830 ES tankless water heater
This tankless water heater features:
  • Endless hot water for residences with two or three showers
  • Electronic ignition system requires 120 volt connection
  • 8.3 gallons per minute capacity at 35°F degree rise
  • Multiple units can be piped together for greater flow capacity
  • Minimum activation flow rate of 0.5 gallons per minute
  • Built-in freeze protection
  • Built for durability and serviceability
  • Modular home certified
  • Energy star rated
  • Integral safety features include flame failure prevention and a temperature limit device to prevent overheating
  • Install indoors or outdoors when installed with optional outdoor kit
  • Available in NG and LP models
  • Can be used in solar thermal, recirculation and space heating applications
  • Overall dimensions: 17 7/8" (w) x 30 1/2" (h) x x 11 1/4" (d)
  • Weight: 67 lbs.
  • View Bosch 830 ES specifications

Venting Specifications
  • Vertical or horizontal termination
  • Vent diameter: 3" or 4" stainless steel category III
  • Minimum vent height: 1' with no elbows
  • Maximum 3" vent length: 28.5 ft.
  • Maximum 4" vent length: 61.25 ft.
Water related specifications
  • Min Flow Rate: 0.5 gpm
  • Inlet Connection: 3/4" NPT
  • Outlet Connection: 3/4" NPT
  • Max Water Pressure: 150 psi
  • Min Water Pressure: 30 psi
  • Connections at bottom of heater
Gas/power related specifications
  • Gas connection: 3/4" NPT
  • Min NG/LP pressure: 3.5 / 8.0 Inch WC
  • Max NG/LP pressure: 10.5 / 13.0 Inch WC
  • Max Input: 175,000 BTU/hr
  • Min Input: 19,900 BTU/hr
  • 83%+ thermal efficiency

Important: these water heaters are not designed for use in mobile installations or above 8000ft A.S.L. altitude. If the inlet water temperature is higher than 140°F, then a 3-way valve or mixing valve must be installed. Outdoor installation requires an outdoor kit (BTOK).


Model Description Price & Quantity
830 ES NG Tankless Water Heater - Natural Gas $1,043.68
830 ES LP Tankless Water Heater - Propane $1,046.22
- OR - View Cart

REQUIRED Accessories

Description Price & Quantity
Pressure Relief Valve - Brass - 3/4" - 150 PSI  
- Required for all tankless water heater installations
$14.67 Enter a quantity and

Optional Accessories

Description Price & Quantity
BTOK - Outdoor Installation Kit $104.38 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" FIP
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.55 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" Sweat
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.35 Enter a quantity and
TSTAT2 - Hand-held Wireless Remote Thermostat $172.14 Enter a quantity and

Bosch Therm 940 ES Tankless Water Heaters

This high capacity tankless water heater is designed to meet the demands of busy households and can even be used in most solar thermal and recirculation applications. Mobile home certified, this model can be installed almost anywhere thanks to its sealed combustion and dual-fan technology.

Bosch 940 ES tankless water heater
This tankless water heater features:
  • Endless hot water for up to three applications at once
  • Electronic ignition and patented burner design
  • Minimum activation flow rate of 0.5 gallons per minute
  • Default 122°F temperature is adjustable with built-in digital control panel with precise 2°F temperature increments between 100°F and 140°F
  • Built for durability and serviceability
  • Integral safety devices including overheat prevention and inlet, outlet, and backflow temperature sensors
  • Available in NG and LP models
  • Overall dimensions: 17-7/8" x 30-1/2" x 11-1/4"
  • Weight: 67 lbs.
  • Low NOx 2012 Compliant
  • View specifications
Venting Specifications
Water related specifications
  • 9.4 gpm capacity at 35°F degree rise
  • 6.0 gpm capacity at 55°F degree rise
  • Min Flow Rate: 0.5 gpm
  • Inlet Connection: 3/4" NPT
  • Outlet Connection: 3/4" NPT
  • Max Water Pressure: 150 psi
  • Min Water Pressure: 30 psi
  • Connections at bottom of heater
Gas/power related specifications
  • Gas connection: 3/4" NPT
  • Min NG/LP pressure: 3.5 / 8 Inch WC
  • Max NG/LP pressure: 10.5 / 13 Inch WC
  • Max Input: 199,000 BTU/hr
  • Min Input: 19,900 BTU/hr
  • 83%+ thermal efficiency

Important: these water heaters are not designed for use above 8000ft A.S.L. altitude 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 Price & Quantity
940 ES NG Tankless Water Heater - Natural Gas $1,234.33
940 ES LP Tankless Water Heater - Propane $1,233.05
- OR - View Cart

REQUIRED Accessories

Description Price & Quantity
Pressure Relief Valve - Brass - 3/4" - 150 PSI  
- Required for all tankless water heater installations
$14.67 Enter a quantity and

Optional Accessories

Description Price & Quantity
BTOK - Outdoor Installation Kit $104.38 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" FIP
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.55 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" Sweat
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.35 Enter a quantity and
Flexible Corrugated Stainless Steel Water Connector
- 3/4" FIP x 3/4" FIP - 18" Long
$7.44 Enter a quantity and
Flexible Corrugated Stainless Steel Water Connector
- 3/4" FIP x 3/4" FIP - 24" Long
$8.26 Enter a quantity and
Flexible Corrugated Copper / Stainless Steel Water Connector
- 3/4" FIP x 3/4" Nom Sweat - 18" Long
$7.60 Enter a quantity and
Flexible Corrugated Copper / Stainless Steel Water Connector
- 3/4" FIP x 3/4" Nom Sweat - 24" Long
$8.33 Enter a quantity and
3/4" Gas Ball Valve $8.27 Enter a quantity and
TSTAT2 - Hand-held Wireless Remote Thermostat $172.14 Enter a quantity and

Looking for more sizes or styles of gas connectors? Yes, we have it!


Bosch Greentherm C 1050 ES Tankless Water Heaters

Condensing water heaters capture the latent heat of the flue gases to essentially pre-heat the water, boosting the efficiency by approximately 10% when compared with an equivalent non-condensing heater. And that's only the tip of the benefit iceberg. Tankless water heaters are inherently more efficent than tank style heaters as they only use gas to heat the water when there is a demand, saving you from wasting money keeping water warm when you don't need it. And, speaking of large, these water heaters are not. Requiring only a fraction of the space of a traditional tank-style water heater, these fantastic condensing water heaters are wall mounted and can typically be vented right through that same wall, saving you even more space, time, and money. Need more hot water at once? No problem - this model may be link with up to four of the same model to meet higher hot water demands. All together, you really couldn't ask for a better water heater!

Bosch Greentherm C 1050 ES tankless water heater
This tankless water heater features:
  • Designed for residential or commercial applications
  • May link up to 4 units for higher hot water demands
  • Minimum activation flow rate of 0.5 gallons per minute
  • Default 122°F temperature is adjustable with built-in digital control panel with precise 2°F temperature increments between 100°F and 140°F
  • Built for durability and serviceability
  • Integral safety devices including overheat prevention and inlet, outlet, backflow, and exhaust temperature sensors
  • Built in freeze protection
  • Available in NG and LP models
  • Overall dimensions: 17-7/8" x 30-1/2" x 11-1/4"
  • Weight: 74 lbs.
  • Low NOx 2012 Compliant
  • View specifications
Venting Specifications
  • May use 3" or 4" Category III stainless steel twin pipe or concentric venting, depending on installation
  • Concentric up-and-out venting for single units
  • Linked units may use a single roof vent
  • Vents vertically or horizontally
Water related specifications
  • 10.7 gpm capacity at 35°F degree rise
  • 6.8 gpm capacity at 55°F degree rise
  • Min Flow Rate: 0.5 gpm
  • Inlet Connection: 3/4" NPT
  • Outlet Connection: 3/4" NPT
  • Max Water Pressure: 150 psi
  • Min Water Pressure: 30 psi
  • Connections at bottom of heater
Gas/power related specifications
  • Gas connection: 3/4" NPT
  • Min NG/LP pressure: 3.5 / 8 Inch WC
  • Max NG/LP pressure: 10.5 / 13 Inch WC
  • Max Input: 199,000 BTU/hr
  • Min Input: 19,900 BTU/hr
  • 94%+ thermal efficiency

Important: these water heaters are not designed for use above 8000ft A.S.L. altitude 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 Price & Quantity
* C 1050 ES NG Condensing Tankless Water Heater - Natural Gas $1,593.56
* C 1050 ES LP Condensing Tankless Water Heater - Propane $1,591.89
- OR - View Cart

REQUIRED Accessories

Description Price & Quantity
Pressure Relief Valve - Brass - 3/4" - 150 PSI  
- Required for all tankless water heater installations
$14.67 Enter a quantity and

Optional Accessories

Description Price & Quantity
BTOK - Outdoor Installation Kit $104.38 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" FIP
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.55 Enter a quantity and
Isolation Valve - Set   (Hot & Cold)   3/4" FIP Union x 3/4" Sweat
- Includes Pressure relief valve rated for 150 psi and 200,000 BTU's
$100.35 Enter a quantity and
Flexible Corrugated Stainless Steel Water Connector
- 3/4" FIP x 3/4" FIP - 18" Long
$7.44 Enter a quantity and
Flexible Corrugated Stainless Steel Water Connector
- 3/4" FIP x 3/4" FIP - 24" Long
$8.26 Enter a quantity and
Flexible Corrugated Copper / Stainless Steel Water Connector
- 3/4" FIP x 3/4" Nom Sweat - 18" Long
$7.60 Enter a quantity and
Flexible Corrugated Copper / Stainless Steel Water Connector
- 3/4" FIP x 3/4" Nom Sweat - 24" Long
$8.33 Enter a quantity and
3/4" Gas Ball Valve $8.27 Enter a quantity and
TSTAT2 - Hand-held Wireless Remote Thermostat $172.14 Enter a quantity and

Looking for more sizes or styles of water connectors?


Related Items & Accessories



Please note: For potential safety reasons, we do not recommend using PVC to vent gas tankless water heaters.
For the best results, always follow the manufacturer's recommendations regarding metal venting pipe.


Stay safe and learn how to turn off your gas in the event of a natural disaster or emergency


Frequently Asked Questions

Q. "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.


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