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Bosch 830ESNG

Therm 830ESNG 18" Natural Gas Tankless Water Heater With 175,000 Max Input BTU, Non Condensing Technology, 150 PSI Max Water Pressure, Energy Star Rated, Electronic Ignition, In Grey
★★★★★ ★★★★★

Therm 830ESNG 18" Natural Gas Tankless Water Heater With 175,000 Max Input BTU, Non Condensing Technology, 150 PSI Max Water Pressure, Energy Star Rated, Electronic Ignition, In Grey


Items that are currently in-transit to our warehouse, are currently in-stock at a drop-ship vendor’s, or manufacturer's warehouse will be marked as "Available". These products will ship once your order is processed (usually within 24-48 business hours). For any exceptions to this timeframe, an ETA (Estimated Time of Arrival) for your order will be emailed with accurate shipping dates in order to ensure that you are always updated and informed as to when your order will arrive at its final destination.

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Items labeled Quick Ship will ship within 2 business days from our East Coast warehouse. Actual delivery times will vary based on your location. If you are ordering multiple items and not all items qualify for Quick Ship, the order will ship when all items are available to ship. Quick Ship may not apply to multiple quantities of the same product.

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  • Energy Star: Yes

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The 830ESNG is another new model from Bosch that offers advanced software, safety and precision controls but requires only 175,000 BTU/Hr input. The 830 ES supports Intelligent Cascading, up to 24 units, so it’s a perfect solution for big commercial applications. It features an electronic ignition system and requires either 3 inch or 4 inch diameter stainless steel vent pipe and can be vented either through the side wall or up through the roof. This heater is Energy Star rated and qualifies for the federal tax credit. Natural Gas Unit. Available at AppliancesConnection


The Bosch Group has been a leading global supplier of technology and services in the areas of Automotive, Industrial Technology, Consumer Goods and Building Technology for over 100 years. The company was founded in Stuttgart, Germany, in 1886 and today has more than 300 subsidiaries in over 150 countries. Every Bosch product is built with one goal in mind; to enhance the quality of your life every day by providing solutions which are both innovative and truly beneficial.


  • Suitable for residential or commercial applications
  • 83%+ thermal efficiency
  • 175,000 BTU maximum input
  • 8.3 gallons per minute capacity at 35F degree rise
  • Cascade up to 24 units to satisfy jobs of all sizes; up to 199 GPM
  • Minimum activation flow rate of 0.5 gallons per minute
  • Electronic ignition and patented burner design
  • Exclusive safety and precision controls
  • Built in freeze protection
  • Vents vertically or horizontally with 3” or 4” stainless steel
  • Can be used in tank loading, solar thermal, recirculation, radiant floor and space heating applications
  • Space saving design with 100% serviceable parts and easy access
  • Mobile home certified
  • Natural Gas Unit


Condensing/Non-Condensing Non-Condensing
Application Residential or Commercial
Max Input (BTU) 175,000
Min Input (BTU) 19,900
Capacity at 35°F Rise (gpm) 8.3
Capacity at 55°F Rise (gpm) 5.3
Intelligent Cascading Yes
Min Flow Rate 0.5 gpm
Temp Range (°F) 100 - 140
Temp Stability (°F) +/- 2
Default Temp (°F) 122
Energy Factor .83
Thermal Efficiency 83%+
Installation Options Indoor or Outdoor (for outdoor, kit required)
Dimensions (w x h x d) 17 7/8" x 31½" x 11¼"
Weight (lbs.) 67
Inlet Connection ¾" NPT
Outlet Connection ¾" NPT
Gas Connection ¾" NPT
Max Water Pressure 150 psi
Min Water Pressure 30 psi
Min NG Presure 3.5" WC
Condensing Heat Exchanger n/a
Venting Options Stainless Steel
Vent Maximun Run 61.5'
Energy Star Rated Yes


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Overall Rating ☆☆☆☆☆ ★★★★★ 4.0
Ease of Use 4.5
Meet Expectations 4.5
Bang for Your Buck 4.3
Average rating out of 4 reviews

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Customer Reviews

 from Colorado Springs, CO
Overall Rating: ☆☆☆☆☆ ★★★★★ 4
Ease of Use: 5
Meet Expectations: 4
Bang for Your Buck: 4

Recommended Product:

Love Love Love my new water heater. No tank so its a big space save. Allows me to have hot water anytime I need it. Great unit overall!

Was this helpful? 👍 0 👎 0

 from Jesup, GA
Overall Rating: ☆☆☆☆☆ ★★★★★ 4
Ease of Use: 4
Meet Expectations: 5
Bang for Your Buck: 4

Recommended Product:

This replaced our old tankless hot water heater that greatly disappointed us. This water heater has made us happy agian with tankless water heaters. This unit was priced reasonably. We had this unit for over 6 months now and no complaints yet. It was easy for us to install as my friend is a plumber. Thanks for a great buy!

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 from Pinehurst, TX
Overall Rating: ☆☆☆☆☆ ★★★★★ 4
Ease of Use: 5
Meet Expectations: 4
Bang for Your Buck: 4

Recommended Product:

This product was easy to install and it does save us a lot more money as compared to a traditional tank water heater. It makes our water just as hot as well. Why would anyone opt to purchase a tanked water heater when this tankless water heater can do the same job if not better without taking up so much space!!!

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 from Schaefferstown, PA
Overall Rating: ☆☆☆☆☆ ★★★★★ 4
Ease of Use: 4
Meet Expectations: 5
Bang for Your Buck: 5

Recommended Product:

Easy installation which my friend and I finshed in a matter of hours. It is working very well so far. It is a definite space saver. Saves us on electric bill becasue it is energy star rated. I would recommend this water heater to all.

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1-4 of 4


  • Brand:Bosch
  • SKU:830ESNG
  • Stock Id:345638
  • Product Number:830ESNG


  • Fuel Type:Natural Gas
  • Tankless:Yes
  • Gallons Per Minute:8.3 Gallons


  • Width:17.875"
  • Depth:11.25"
  • Height:30.5"

    Technical Details

  • Color:Grey
  • Weight:67 lbs
  • Energy Star:Yes
  • Voltage:120 Volts
  • Usage:Residential