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Bosch Therm 520 HN NG (Natural Gas) Whole-House Tankless Water Heater

3.5 out of 5 stars 11 customer reviews
| 13 answered questions

Price: $979.39 & FREE Shipping. Details
Item is eligible: No interest if paid in full within 12 months with the Amazon.com Store Card. Apply now
Usually ships within 1 to 2 months.
Ships from and sold by Amazon.com. Gift-wrap available.
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  • Mounting of 1 new customer-supplied heater
  • Attaching water pipes and any needed gas lines
  • System test and clean up
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  • Pro will contact you within 1 business day to schedule
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Estimate: $612.79
86% positive ratings (44 reviews)
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  • 117,000 max input (BTU)
  • 80% thermal efficiency
  • Patented Hydro-power ignition requires no electricity
  • Endless hot water for up to 2 applications at a time
  • Vents with galvanized B vent - natural draft
1 used from $540.20
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$979.39 & FREE Shipping. Details Usually ships within 1 to 2 months. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently bought together

  • Bosch Therm 520 HN NG (Natural Gas) Whole-House Tankless Water Heater
  • +
  • Webstone 44443WPR 3/4-Inch IPS Isolator EXP E2 Tankless Water Heater Service Valve Kit with Clean Brass Construction
Total price: $1,039.38
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  • Buy Used and Save: Buy a Used "Bosch Therm 520 HN NG (Natural Gas) Whole-House Ta..." and save 45% off the $984.00 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

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This item Bosch Therm 520 HN NG (Natural Gas) Whole-House Tankless Water Heater
Customer Rating 3 out of 5 stars (11) 4 out of 5 stars (181) 3 out of 5 stars (122) 4 out of 5 stars (49)
Price $979.39 $533.99 $263.63 $1,054.99
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Amazon.com Amazon.com
Item Dimensions 8.66 x 16.73 x 25.75 in 13.8 x 6.7 x 20.3 in 15 x 4 x 24 in 17.75 x 11.25 x 24.88 in
Add to Cart Add to Cart Add to Cart Add to Cart

Product description

Product Description

The Therm 520 HN incorporates an evolutionary hydro-power ignition system which allows this tankless water heater to work without a standing pilot, grid connection or battery! A small turbine inside the water heater uses the energy from the flowing water to ignite the burner. The modulating gas valve then maintains a constant temperature at varying flow rates. This innovative technology, patented by Bosch, makes this an ideal product for installations without access to electricity or regions prone to inclement weather and power outages.

From the Manufacturer

The Therm 520 HN incorporates an evolutionary hydro-power ignition system which allows this tankless water heater to work without a standing pilot, grid connection or battery!


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