Water Pumps & Pressure Vessels

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Water Pumps & Pressure Vessels

The water pump is the beating heart of the water system in your camper, caravan, or boat. With a pumping motion, the water pump draws water from the water tank and pressurizes it into the water pipes. This creates pressure in the water pipes, allowing water to be pumped to other devices, such as a boiler, within the water system. A water system with a water pump operates very similarly to a home water system, working with pressure in the pipes. When a faucet is opened, water flows out due to the pressure.

Water Pressure from the Water Pump

Having a pressurized water system is great, but when installing and purchasing other devices, it's important to consider if they can handle the working pressure of the water pump. Boilers often have a maximum water pressure they can withstand. While most boilers have overpressure protection, it's important to ensure that the water pump and boiler are compatible in terms of working pressure. Some boilers may not tolerate water pressure at all. Therefore, it's crucial to review this information carefully or seek our guidance.

Connecting the Water Pump

A water pump has a connection for the water pipe or hose and an electrical connection for the pump. A water filter is often available at the water inlet to prevent harmful particles from entering the pump. Sometimes, the filter is included with the water pump, or it can be purchased separately. The connection is usually a hose barb ranging from 8 to 12 mm. Depending on the diameter of your water system, an adapter may be required to connect the water hose or pipe to the pump. This information is specified with the water pumps. It may also be necessary to use an adapter to return to the correct hose diameter at the outlet of the water pump. The electrical connections for the water pump are relatively simple. Connect the red wire to the switch and a fuse to the positive terminal of the battery. The black wire goes to the negative terminal.

Check Valve

To prevent water from flowing back into the water tank when the faucet is closed, check valves are used. These valves ensure that the water in the system cannot flow backward. They have a connection for the water hose and are integrated into the water system accordingly. Therefore, water can only move forward in the system. It can be useful to install check valves at various points in the water system.

When to Use a Water Pump vs. a Submersible Pump?

If you have multiple water points in your camper, caravan, or boat, it is recommended to use a water pump instead of a submersible pump. Using a submersible pump would require a larger electrical installation to connect multiple water points. With a water pump, you only need to connect the pump to the battery. Due to the pressure system, you also don't need to connect each individual microswitch in the water point faucets to the pump. This is necessary in a system with a submersible pump. If you only want to connect a cooking and sink combination or have a single sink in your camper, caravan, or boat, a submersible pump is often a simpler choice. The advantage of a submersible pump is that it is placed in the tank and takes up less space.

Pressure Vessel

When installing a water pump, we recommend adding a pressure vessel or expansion tank to the system. By connecting it after the pump in the water system, it absorbs the pulsating action of the pump, resulting in a consistent water flow from the shower or faucet. The pressure vessel also prevents the pump from frequently turning on and off because the pressure in the water pipes remains more stable. This is beneficial for the pump's lifespan and reduces noise in the camper, caravan, or boat.