Campervan Water Pump Calculator
Pick the right 12 V water pump spec for your van. Get recommended flow (L/min) and pressure (bar) based on outlets, comfort, pipe size and accumulator.
Do I need an accumulator tank?
It smooths pulsing, reduces cycling noise, and widens the comfortable pressure range. Not mandatory, but highly recommended for showers and “home-like” feel.
Which pipe size should I use?
**12 mm** suits most builds. **10 mm** can restrict flow; **15 mm** helps longer runs but may make small pumps feel weak. Match pipe and fittings to the pump’s rated flow.
Basic vs home-like comfort — what changes?
Home-like targets a higher **flow and pressure** for better shower rinsing and mixer stability. It costs a bit more in power, noise, and potential spray.
Can I run outdoor and indoor showers on one pump?
Yes—size for the **full** outlet count and keep hose lengths reasonable. An accumulator helps when taps open/close quickly.
How do I avoid leaks with higher pressure?
Stay within the pump’s rated bar, use quality push-fit/barbed fittings, add a **strainer**, and secure lines to reduce hammer.