Rinnai MC-91-US1 Control

The MC-91 control is the window to our tankless water heaters. They allow the user to view and interact with the water heater's operation, and provide technical and service details for trouble-free operation year after year.

User Interaction

Residential Setting: 98 - 140¡F (37 - 60° C)

Commercial Setting: 120 - 185¡F (49 - 85° C)

Digital Temperature Controller Accurate to =/-2° F

In Use Indicator

On Board Diagnostics and Safety Monitoring

Priority and On-Off Switches

Specification Table

Dimensions: 1"D x 3"W x 4" H

Weight: Less Than 1 lb.

2 Wire 18 Gauge Wire Connection

12 Volt DC Signal