Rinnai RUCS65i Installation And Operation Manual page 40

Piping Diagram for Basic Installation
Condensate Gas
drain line connection
Hot water
Water
outlet
drain plug
The condensate drain pipe (along its entire
length) must be at least the same diameter
as the drain line, (1/2 inch NPT).
Refer to the Condensate
section in the venting
instructions
40
Cold water
inlet
Condensate Drain Line
Condensate Drain
3/4" Hot Water Supply Line
For Building Fixtures
KCM Series Manual
3/4" Gas Connection
Gas Supply
3/4" Cold Water Supply Line