1. DON'T put antifreeze in the water tank. Use a winterizing kit to draw antifreeze into the system with the pump. Drain the water tank and leave it alone.
2. DON'T put antifreeze in a water heater tank... see ^
3. If the unit has low point drains open them and catch the drainage.
When putting the unit back in service you have to identify every T and branch line in the system incuding the low point drains. You have to flush every line and T with fresh water from the tank. Don't start with the city connection.
If you miss a T that is upstream from your tap you will taste RV anti for the next 5000 gallons
:)
