Fresh Water Tank

Function
  • Made of durable polyethylene plastic, fresh water tanks come in various sizes, typically ranging from 20 to 100 gallons, depending on the RV size and model.
  • They are usually located underneath the RV, though some may be inside a designated compartment.
  • Fresh water tanks can be filled in two ways:
    • Gravity Fill: This method involves using a funnel and hose to transfer water from an external source, such as a jug or campground tap, directly into the tank’s inlet port. This inlet will often have a backflow preventer to prevent contaminated water from entering the tank.
    • Pressurized Line: You can also fill the tank by connecting a hose to the RV’s city water connection and pressurizing the system. However, a pressure regulator is recommended to prevent damage from excessively high water pressure.
  • Level Sensors: Most fresh water tanks come with built-in sensors that indicate the water level on the RV’s control panel. This helps you monitor your water supply and avoid running out.
  • Overflow Spillway: A safety feature, the overflow spillway prevents the tank from overfilling and potentially cracking. When filling the tank, watch for water flowing out of the spillway, indicating the tank is full.
  • Drain Valve: Located at the bottom of the tank, the drain valve allows you to completely empty the tank for cleaning, winterization, or long-term storage.
  • Spin-Welded Fittings: Fresh water tanks have various openings for fill ports, drain valves, and sensor connections. These openings are fitted with parts that are spin-welded to the tank. Spin welding is a heat fusion process that creates a permanent, watertight bond between the fitting and the tank. This ensures a secure connection that can withstand the pressure of the water system.
Location and Mounting

1. Above-Floor Mounting:


Fresh water tanks are often mounted above the floor in Class C & B RVs, typically underneath the bed platform in the rear of the vehicle. This location offers easier access for filling and maintenance.

2. Below-Floor Mounting:


Fresh water tanks can also be mounted below the floor, typically towards the chassis frame of the RV. this can be mounted in a few different ways:

  • L-brackets: These can be used under the flange of the tank and then self tapped into the side of the frame to provide support and prevent movement.
  • Straps/Brackets: Durable straps made of metal or synthetic materials wrap under the tank and connect to mounting points on the RV frame for added stability.