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Venting Requirements For
Gas Tankless Water Heaters

In general, the tankless water heater should be installed where the vent length is as short and straight as possible. The exceptions to the short distance would be the Bosch 38B, 125B, 1000P, 1600H, 1600P and the 125HX which have a minimum vent length of 6 feet. If you live in a warm (non-freezing) area than you have the option of installing the Bosch 250SXO, 125BO and 2400EO models outside with no need for venting. Otherwise the units are designed for an indoor installation with exhaust venting.

Venting Options for a Propane Tankless Water Heater

  • Bosch 38B, 1000P Models: Vented vertically (through roof) only.  Use 4" diameter type B (double wall) vent - 6' minimum vertical height.

  • Bosch 125B, 125HX, 1600H, 1600P Models: Vented vertically (through roof) only.  Use 5" diameter type B (double wall) vent - 6' minimum vertical height.

  • Bosch 125FX Models : Vented horizontally (through wall) only.  Use 4" dedicated, sealed, single wall vent (stainless steel or 26+ gauge galvanized). 15' maximum run with two elbows - must terminate horizontally.  FXHOOD required.

  • Bosch 250SX, 2400E Models : Can be vented vertically or horizontally. 3" diameter dedicated, sealed, single wall vent (stainless steel). 26' maximum run with one elbow - subtract 2.5' for each elbow. Please see our 3” Venting Guide

Important Factors to Consider

Gas Venting Requirements
Gas Line Sizing Requirements
Gas Combustion Air Requirements

 

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