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Bosch Therm 330 PN Tankless Hot Water Heater – No longer available

Certified by OTL US

Certified for use in all provinces and states in North America.

NOTE: Due to a change in CSA Regulations regarding minimum thermal efficiency, Bosch On-Demand Water Heaters are no longer available.


  • 1369

Tankless, on-demand water heaters are fuel efficient, save money and protect our environment.


  • Piezo ignition system requires no electrical connection
  • 77%+ thermal efficiency
  • 74,900 BTU maximum input
  • 3.3 gallons per minute capacity at 35F degree rise
  • Endless hot water for 1 application 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
Therm 330 PN Specifications
Condensing/Non-Condensing Non-Condensing
Application Residential
Max Input (BTU) 74,900
Min Input (BTU) 23,906
Capacity at 35°F Rise (gpm) 3.3
Capacity at 55°F Rise (gpm) 2.1
Intelligent Cascading No
Min Flow Rate 0.5 gpm
Temp Range (°F) High – Low
Temp Stability (°F) n/a
Default Temp (°F) n/a
Energy Factor .68
Thermal Efficiency 77%
Installation Options Indoor
Dimensions (w x h x d) 12 ¼” x 22 7/8″ x 8¾”
Weight (lbs.) 26
Inlet Connection ½” NPT
Outlet Connection ½” NPT
Gas Connection ½” NPT
Max Water Pressure 150 psi
Min Water Pressure 40 psi
Min LP Presure 11″ WC
Condensing Heat Exchanger n/a
Venting Options Galvanized B-Vent
Vent Maximun Run n/a
Energy Star Rated No


Bosch Therm Tankless Water Heaters Brochure

Bosch Therm 330PN Installation Manual

Bosch Therm 330PN Replacement Parts

We do not sell the venting required for these units but they are available at:

7959 Enterprise St, Burnaby, BC V5A 1V5
(604) 420-4323

Installation Guide for B-Venting


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