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Rinnai Tankless Water Heater Installation and Operation Manual 21
4.3.5 Freeze Protection
drained).
Figure 7: Freeze Protection Piping Diagram
Route Drain Per Local Code
Cold Water
Supply Line
1/2 in. Normally Open Solenoid Valve
Hot Water
Supply Line
3/4 in. Normally Closed Solenoid Valve
Legend
Vacuum Breaker
Pressure Relief Valve
Union
Check Valve
Ball Valve
Solenoid Valve
Drain Valve
* Position vacuum breaker
above water heater.
Gas Supply
Freeze Protection Piping Diagram
Vacuum Breaker *
Union
Route Drain Per Local Code
Hot Water
Line
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