Installation Sheet

44 Rinnai Tankless Water Heater Installaon and Operaon Manual
• The piping (including soldering materials) and components connected to this appliance must be approved for use in
potable water systems.
• Purge the water line to remove all debris and air. Debris will damage the water heater.
• The appliance must not be connected to a system that was previously used with a non-potable water heang
appliance.
• Ensure that the water lter on the water heater is clean and installed.
• DO NOT introduce toxic chemicals such as those used for boiler water treatment to the potable water used for
space heang.
To connect the water supply, follow the instrucons below.
IMPORTANT: Water connecons to the water heater should follow all state and local plumbing codes.
If this is a standard installaon, refer to the “Piping Diagram for Basic Installaon” below.
1. Plumb the cold water supply line to the water heater on the 3/4 in. MNPT connecon at the boom of the water
heater marked “COLD.”
2. Plumb the hot water supply line to the 3/4 in. MNPT connecon marked “HOT.”
3. If a pipe cover will be installed, make sure water lines to the water heater t within the connements of the pipe
cover.
The condensate drain pipe (along its enre
length) must be at least the same diameter
as the drain line (1/2 in. NPT).
Refer to secon “3.9 Condensate” for more
informaon.
PIPING DIAGRAM FOR BASIC INSTALLATION
3.6 Connect the Water Supply
Floor Drain
Gas Supply Line
Cold Water Supply Line
Hot Water Supply Line
Condensate
Drain Line
Guidelines
Instrucons