Campervan Plumbing: Key Components, Common Issues and Maintenance Tips

A reliable water system is essential for any caravan trip, but common issues like failing taps, low pressure, or strange smells can quickly ruin your off-grid experience. Unlike static residential plumbing, caravan plumbing systems must be lightweight, durable enough to withstand constant road vibrations, and engineered for self-sufficiency. To safely deliver water for drinking, cooking, showering, and sanitation, these specialised setups rely on a network of storage tanks, 12V pumps, and robust components designed to perform anywhere the road takes you.

Core Components 

Getting reliable and fully operational campervan plumbing centres on the three main subsystems that store, pressurise, heat and drain water: 

Fresh water Supply System 

This stores and supplies clean water for drinking, cooking and washing, much like a scaled-down version of a home water supply systems. Key components include: 

• Freshwater tank: Built from heavy-duty, food-grade polyethylene plastic, freshwater tanks store between 20 and 100 litres of water. They are typically mounted inside the vehicle or under the chassis to save space. 
• Fill points and inlets: These are exterior access points that connect campervans and caravans to external water sources, often as lockable gravity fill inlets or direct mains pressure hose connections. 
• Pipes and hoses: Constructed from flexible, food-grade PVC hoses or rigid polyethylene/polybutene plumbing lines, these are colour-coded for easy identification and quicker repairs. Use blue hoses and piping for cold water, red hot water lines from water heaters to taps and clear or white breather hoses to prevent excess air, vacuum locks and overflowing. 

Water Distribution and Heating 

This network delivers pressurised water to taps, showers and appliances. 

• Pumps: Pumps pull fresh water from tanks, and ensure consistent flow and pressure. Submersible pumps sit directly in tanks, operate quietly and activate with microswitches in taps. For higher pressure in showers, fit vehicles with externally-mounted 12V pressure or diaphragm pumps. 
• Pre-pump filters and strainers: Installed on the inlet side of pumps, filters and strainers catch debris and sediment, prevent clogging and air leaks, and extend water pump lifespans and efficiency. 
• Heaters and boilers: Standalone mains or gas-powered 240V water heaters heat and store up to 10 litres of  water for taps and showers. For smaller caravans and campervans, and where space is a premium, choose combi heaters. These provide cabin and water heating in a single unit, usually running on gas, diesel or electricity. 

Greywater Drainage System 

Greywater systems remove used wastewater away from living areas. They consist of:

• Grey water tanks: Supplied in matching capacities and the same durable polyethylene construction as freshwater tanks, these are mounted in the vehicle underbody, wheel arches or side sills and empty wastewater in designated disposal sites. 
• Drain piping: Wastewater is emptied from sinks, taps and showers via flexible convoluted PVC hoses or rigid ABS/PVC piping. They are fitted with strainers and waste traps to prevent foul-smelling wastewater from coming back up shower and sink drains. 

Connecting pumps, heaters and fixtures within a single leak-free system are matching campervan plumbing fittings. These create secure transitions between different materials and pipes or hoses in varying diameters, route cold and hot water from pumps to taps, sinks and showers, maintain consistent water pressure and prevent leaks or overflowing. They also simplify repairs and routine maintenance. 

Common Campervan Plumbing Issues and Troubleshooting 

Sputtering Taps and Intermittent Flow 

If taps are spitting out irregular bursts of air rather than maintaining a solid water stream, check for suction leaks in pumps, cracked strainer bowls, or failing non-return valves. First, check water tank levels, cracks in inlet hoses, and that airlocks have been removed after refills. Straighten or clean kinked or blocked hoses, run all taps simultaneously to remove airlocks, and inspect the pump connections and wiring. 

Weak or Intermittent Water Pressure 

Water that trickles or pours with very little force, or varies between stream surges and sudden drops, points to pressure issues. Check for blocked filters or pipes, that pumps get enough battery voltage and pressure switches work as they should. Clean or replace clogged water filters, check or charge secondary batteries, and adjust or replace pressure switches. 

Persistent Pump Running 

Persistent campervan water pump operation usually means the system is losing pressure, drawing air, or experiencing a pressure-switch failure. Pumps that run continuously often point to low freshwater tank levels. Those that create intermittent water pressure usually mean smaller system leaks or failing non-return valves.  Check for leaks in hoses, taps and connections, ensure all connections are airtight, and check whether pressure switches are stuck in the “ON: position. 

Foul Drain Odours and Bad Tasting Water 

Grey water tanks collect food particles, soap, dirt, and other contaminants that can rot and send obnoxious smells up through sinks and shower trays. Regularly flush grey water tanks with specialised caravan and campervan tank cleaners, check for bacteria and algae growth and always use food-grade hoses and piping. 

Leaking or Burst Pipes 

Drain the system of water before colder months to prevent ice buildup and expansion as water freezes. Open all taps and run pumps to clear residual moisture. For hoses, pipes and tanks that have burst or leak in warmer weather, check for loose connections, use waterproof sealant on minor cracks, and ensure fittings are not overtightened. 

Hot Water System Not Working 

Cold or lukewarm water, rumbling and clicking noises and discoloured or foul-smelling water are common signs of a failing hot water system. Ensure gas tanks are open, batteries are fully charged and circuit breakers are intact. Also, check for stuck valves, possible airlock in boilers and that thermostats and heating elements are working. Easy fixes are running cold and hot water taps at the same time and resetting temperature switches on heater control panels. 

Preventative Maintenance Tips 

To keep your campervan plumbing system functioning flawlessly, perform regular maintenance. Regularly sanitise freshwater tanks, hoses and pipes using specialised caravan and campervan cleaner or diluted bleach solutions every six months to eliminate bacteria and algae buildup. These also  prevent musty and sulphur-like smells in drinking water and limescale buildup that can degrade pumps, rubber seals, and heating elements. To the same end, replace hose filters monthly, and standard canister or cartridge filters every 3 to 6 months. 

Mid to early autumn is best for winterising the system. Turn off pumps and heaters to prevent electrical damage, open heater drain valves to fully empty boilers, open all taps, and clear remaining water from showers and pumps. Continue by removing filters and pouring non-toxic motorhome antifreeze down sinks and shower drains. Leave everything open for the entire duration of the freezing weather or storage period.  

Finally, make it a habit to inspect fittings and valves beneath sinks and near the pump for leaks, ensuring small drips do not turn into major water damage.