Bosch Therm 520 PN NG Indoor Natural Gas Tankless Water Heater

The Bosch Therm 520 PN NG is the perfect tankless solution for smaller families and households that only use no more than two hot water applications at a time.

  • 78%+ thermal efficiency
  • 5.3 gallons per minute capacity at 35F degree rise
  • Vents with galvanized B vent, natural draft
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SKU: BT-520-PN-NG-ITWH Category:

Water Heater Description

This Bosch Therm 520 PN NG model offer Piezo push-button ignition and utilizes a modulating gas valve to ensure a constant temperature at varying flow rates. Minimum activation flow rate of 0.5 gallons per minute. Endless hot water for up to 2 applications at a time. Features 78%+ thermal efficiency. Utlizes natural gas as a fuel.

Manufacturer SKU: Bosch Therm 520 PN LP

Manufacturer PDF: Bosch_Therm_Compact_Tankless_Water_Heaters_Sell_Sheet.pdf

Water Heater Specifications




Natural Gas


Tankless (whole house)

Ignition Type

Piezo Electric

Energy Star


Water Heater Warranty will honor all warranties in accordance with manufacturer policies and procedures. Manufacturer warranty issues should be addresses directly with the manufacturer.

15 year limited warranty on heat exchanger | 2 year warranty on all other parts