
Rinnai Tankless Water Heater Installation and Operation Manual
9
3.2 Main Components
Ignition Unit
PC Board
Controller
(removed for
clarity)
Heat Exchanger
Figure 3: Main Components
Fan Motor
Assembly
Condensate Drain
(indoor models only)
Concentric 3 in. Exhaust/ 5
in. Combustion Air
(indoor models only)
Gas Manifold
Gas Control
Water Flow
Servo (Bypass
Servo certain
models)