Tankless Water Heater 520 PN

888 718-8448
Tankless Water Heater 520 PN

Tankless Water Heater 520 PN

This Bosch Therm 520 PN model offer Piezo push-button ignition and utilizes a modulating gas valve to ensure a constant temperature at varying flow rates. The 520 PN is the perfect tankless solution for smaller families and households that only use no more than two hot water applications at a time. While it provides endless hot water, it saves money because it only heats water when you need hot water.

Therm 520 PN Specifications:

  • Non-Condensing
  • Residential Application
  • Max Input (BTU) 117,000
  • Min Input (BTU) 30,725
  • Capacity at 35°F Rise (gpm) 5.3
  • Capacity at 55°F Rise (gpm) 3.4
  • Thermal Efficiency 78%+
  • Installation - Indoor
  • Dimensions (w x h x d) 18½" x 36¾" x 10½"
  • Weight (lbs.) 35
  • Inlet Connection ½" NPT
  • Outlet Connection ½" NPT
  • Gas Connection ¾" NPT
  • Max Water Pressure 150 psi
  • Min Water Pressure 30 psi
  • Min NG Presure 5.7" WC
  • Venting - Galvanized B-Vent

Features & Benefits:

  • Piezo ignition system requires no electrical connection
  • 78%+ thermal efficiency
  • 117,000 BTU maximum input
  • 5.3 gallons per minute capacity at 35F degree rise
  • Endless hot water for up to 2 applications at a time
  • Minimum activation flow rate of 0.5 gallons per minute
  • High to low temperature control
  • Vents with galvanized B vent – natural draft
  • Built for durability and serviceability with 15-year warranty and 20+ year life expectancy


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


Get a quote



  • "Thanks for the great job!"

    Thanks for the great job and for being meticulous throughout with everything!

    Ira S., Little Neck, NY

  • "Richair Comfort Solutions were very professional and knowledgeable..."

    I contacted several companies for an estimate to install new ductless air conditioning system. I found Richair Comfort Solutions; they were very professional and knowledgeable. Their product specialist spent a lot of time explaining the differences in ductless systems available today. I took their advice and I am really happy with my new ductless system.

    Mark, Fort Lee, NJ 07024

  • "This company is very honest, fair and professional..."

    I am more than satisfied with Richair Comfort Solutions' workmanship and business practices. This company is very honest, fair and professional. They work clean and answered all our questions clearly and effectively. Highly recommend to all!

    Nick C.
    New York, NY