Rinnai RH180 Specifications download pdf (Page 24)

The RH180 has a maximum input of 91,300 Btu. Under most circumstances the same supply gas

line that supplies a standard atmospheric tank water heater (40 gallons or more) will adequately

supply the RH180. Consider the following:

• All gas appliances in the structure MUST be included in gas sizing calculation.

• Flexible gas supply lines connected directly to the RH180 MUST be able to supply a minimum

of 91,300 Btu for NG or 87,300 Btu for LP.

• Consult the NFPA 54 National Fuel Gas Code Pipe Sizing Guidelines to ensure adequate gas

supply is provided.

• Supplied gas pressure must be within the recommendations listed on the unit’s rating plate.

• The RH180 requires a higher gas supply than standard 40 gallon tank water heaters.

- The RH180 has a maximum input rating of 91,300 Btu (natural gas models).

- The average 40 gallon gas-fired tank water heater has an input rating of approximately 40,000 Btu.

- In this example, the difference between the RH180 and the 40 gallon tank water heater is

51,300 Btu.

This additional gas load must be considered when installing this product.

• Issues caused by insufficient gas supply:

- Poor appliance operation or intermittent error codes.

- Rumbling noises due to insufficient air/gas mixture.

If any symptom exists suggesting a gas supply issue may be present, a gas manometer will be needed to

verify incoming pressure.

Gas Installation

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Rinnai RH180 Specifications Page 24