Review of Rinnai RL94iP

Combining fuel type and form for great savings

Rinnai RL94iP Propane Tankless Water Heater, 9.4 Gallons Per Minute
Rating: (4.4 out of 5 stars)

Type of HeaterPropane Tankless
Size / Capacity9.4 GPM
Dimensions22.9 x 14 x 9.6 inches

Rinnai RL94iP

The Rinnai RL94iP tankless water heater is the propane counterpart of the RL94iN that similarly delivers 9.4 gallons per minute (GPM) of hot water. (The RL94iP requires 0.4 GPM to activate. Minimum flow rate is 0.26 GPM.) With the RL94iP you have sufficient supply of hot water to five plumbing fixtures or water-intensive appliances simultaneously. Hot water remains at constant pressure without deviating from the set temperature.

Review Details

This indoor unit comes with a digital controller that lets you adjust the temperature and also indicates error messages. For residential applications, recommended settings range from 98oF to 140oF; for commercial, 98oF to 185oF. (The controller for commercial use is sold separately.)
The unit operates with a water range of 20-150 PSI, but Rinnai recommends 30-80 PSI for optimum performance.

Similar to the RL94iN, the RL94iP lets you save as much as 40% in energy consumption and reclaim so much of your space due to its compact size. It requires ¾ -inch connections for inlet, outlet, and gas, and comes with brass isolation and pressure relief valves to ensure durability. The gas requirement is 199,000 BTU.

The good

The advantages of the Rinnai RL94iP:

  • Constant water even for simultaneous use
    This unit is powerful enough to supply hot water for two showers and two sinks at once. Water remains at temperature and is consistent throughout use.
  • Direct power vent
    The coaxial pipe moves both fresh air and exhaust in the unit; it does not require surrounding air to heat water and cool exhaust. The closed system of the intake and exhaust vents does not allow cold or warm air to enter the unit when it is off.
  • Modulated burning
    Because this unit monitors both the temperature and water flow and adjusts accordingly, it can effectively enable you to lessen your fuel usage.
  • Durability
    If properly installed, operated, and maintained, the manufacturer assures the unit to last 30 years.
  • Warranty
    Rinnai guarantees the unit for 12 years (residential) and 5 years (commercial); the parts for 5 years; and labor for one year. Note that if you use this unit as part of a recirculating system, both the residential and commercial warranties will be reduced to three years only.

The not so good

The disadvantages of the Rinnai RL94iP:

  • Expensive installation
    Professional installation is required; otherwise, you void the warranty. The unit also requires special ventilation (concentric venting system) that is not available at hardware stores; this has to be purchased from the manufacturer.
  • Sensitive circuitry
    One owner cited that clean power is required due to the sensitivity of the circuits; he bought an inverter converter to address this matter.
  • Professional repair
    Should the unit fail at some point, a certified technician is necessary to repair the unit.

Our Verdict

The Rinnai RL94iP Propane Tankless Water Heater easily meets your demand for plenty of hot water. While the price is high (slightly over $1000), it offers more compared to other propane-powered water heaters.Just remember that tankless water heaters are an investment. It will take some time before you reap the monetary gains.

When installing this unit, it’s always best to find a professional who is experienced in tankless water heater installation, and preferably with this particular brand.

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