90 11/6/2018
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
• An adequate gas supply is critical for proper operation of all Rinnai water heaters.
• The inlet gas pressure to the N-Series water heaters must be within the limits shown on the product’s rating
plate, Natural Gas = 3.5” – 10.5” W.C. and Propane Gas = 8.0” – 13.5”
• For gas pipe sizing refer to the National Fuel Gas Code, NFPA 54 or applicable State or Local Codes.
• If the gas supply piping is properly sized, your inlet gas pressure should never drop more than 0.3 inches of
water column on Natural or 0.5 inches on Propane gas when using black iron piping with all gas appliances
firing on high fire.
• If using a gas piping other than black iron, please refer to that manufacturer's pressure drop and line sizing
charts for the proper pressure drops and line sizing data.
• Ensure all gas appliance connectors (flexible lines) are approved and sized to handle the Btu load of the
appliance it is being connected to.
Gas
• Insufficient gas supply can result in:
- Poor appliance operation and/or water heater shutdown due to fault codes.
- Noisy operation due to an incorrect gas/air mixture.
- Failure of heat exchanger over a period of time due to condensation forming in combustion
chamber. This hold true for all gas appliances.
- Soot build-up inside heat exchanger.
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