Rinnai REU-KCM2025FFU-US User Manual

Direct Vent Tankless Water Heater
Installaon and Operaon Manual
 

 
• 
• 
• ’’
• 
 


WARNING

This manual provides informaon on the installaon, operaon, and maintenance of the water heater. For proper
operaon and , it is important to follow the instrucons and adhere to the safety precauons.
A licensed professional must install the water heater according to the exact instrucons in this manual.
The consumer must read the enre manual to properly operate the water heater and to have regular maintenance
performed.
RUCS75i and
RUS75e Models
FOR INDOOR APPLICATIONS ONLY
RUCS65i ................ --
RUCS75i ................ --
FOR OUTDOOR APPLICATIONS ONLY
RUS65e ................. --
RUS75e ................. --



● 
C US
U328-0700X01(01)

Rinnai REU-KCM2025FFU-US Specifications

General

Type	Tankless
Maximum Flow Rate	9.8 GPM
Energy Factor	0.95 UEF
Dimensions	26.4 x 18.5 x 10.0 inches
Weight	55 lbs
Warranty (Heat Exchanger)	12-Year Limited
Warranty (Parts)	5 years
Minimum Flow Rate	0.5 GPM
Venting	Concentric or Twin Pipe
Power Supply	120 VAC
Flow Rate	9.8 GPM
Ignition Type	Electronic Ignition
Fuel Type	Natural Gas / Propane
Gas Type	Natural Gas
Maximum BTU Input	199, 000 BTU/h
Minimum BTU Input	15, 000 BTU/h
Temperature Range	98°F - 140°F
Maximum BTU	199, 000 BTU/h
Minimum BTU	15, 000 BTU/h
Vent Material	PVC / CPVC

Summary

Installation Instructions (for the licensed professional)

Installer Qualifications

General Instructions

Determine Installation Location

Installation of Venting (indoor models only)

Twin Pipe PVC/CPVC Vent Installation

Installation of Plumbing

Pressure Relief Valve Requirements

Isolation Valves

Installation of Gas Supply

Connect Water Heater to Water Supply

Connect Electricity

Final Checklist

Specifications

Technical Data

Technical data and specifications for the Rinnai water heater models.

Operation Instructions

Consumer Operation Guidelines for the Safe Operation of your Water Heater

Step-by-step instructions for safely operating the water heater.

Diagnostic Codes

Diagnostic Codes and Remedies

Required Maintenance

Flushing the Heat Exchanger

Limited Warranty for RUCS65i, RUS65e, RUCS75i, & RUS75e Value Series Water Heater