How much water do you really use in a van?
The honest answer: between 9 and 30 litres per person per day depending on your lifestyle.
The 4 uses not to underestimate
Consumption table by profile
| Profile | L/day/person | Notes |
|---|---|---|
| Solo minimalist | 9-12 L | No daily shower |
| Solo comfort | 18-22 L | Solar shower every 2nd day |
| Equipped couple | 22-28 L | Daily hot shower |
| Family of 4 | 15-20 L/person | Cooking economies of scale |
| Coastal sailor | 10-15 L/person | Seawater for showering |
The 20% margin rule
Never calculate to the bone. Always add 20% for the unexpected: a closed service point, guests, a heatwave that doubles consumption.
How to choose your water tank?
Sizing formula
Capacity = (Use/day x Autonomy) x 1,2
Example: couple (22 L/day x 2) x 4 days x 1,2 = 211 L → go for a 120 L with regular resupply
Recommended materials
Avoid: non-food-grade flexible PVC, uncertified salvage tanks.
The 5 best water sources for vanlifers in France
Motorhome points (5 200+ in France)
Drinking water + waste dump. 2-3 EUR or included in a motorhome area overnight.
Campsites by day
Quick stop for water + shower for 3-5 EUR. Ask at reception.
Apps
Park4Night, iOverlander, iSprings (Water.io). Water points validated by the community.
Town halls and fountains
An outdoor tap is often accessible. Legal, mains water.
Rainwater harvesting
Greywater only in France. Level 2 filter to make it drinkable.
Van water filtration: which system to choose?
| Level | Use | Equipment | Budget |
|---|---|---|---|
| 1 — Sediments | Cloudy mains water, rain | Ceramic, 5-25µ cartridge | 15-40 EUR |
| 2 — Bacteria+viruses | Stream, lake, fountain | Katadyn Befree, SteriPen | 60-350 EUR |
| 3 — Reverse osmosis | Seawater (boat) | Compact 12V reverse-osmosis unit | 800-3 000 EUR |
Europe van recommendation: Level 1 + Level 2 are enough. Reverse osmosis = boats only.
Pump, tap, water heater: installing your system
| Type | Advantages | Price |
|---|---|---|
| Submersible 12V pump | Comfort, constant flow, 1-3A | 30-80 EUR |
| Manual pump | 0 electricity, ultra reliable | 20-50 EUR |
| 20L solar shower | 0 energy cost, ideal in summer | 8-15 EUR |
| 12V boiler (5-10L) | Hot water all year | 120-250 EUR |
| Gas water heater (Camplux) | Decent flow, popular | 80-200 EUR |
Maintaining your water system — anti-Legionnaires' protocol
Legionnaires' disease develops in stagnant circuits between 25°C and 45°C. A van parked up in summer brings together exactly these conditions.
Monthly protocol
- Empty the tank completely — taps open
- 1 g of food-grade active chlorine per 100 L — fill to 20%, shake
- Let it act for 30 min — rinse 3 times with clean water
- pH strip test (target 6,5-8,5) — refill with fresh water
Winterizing: full drain + blowing out the pump and lines. Food-grade alcohol in the lines before a long shutdown.
Azimut AI water autonomy score
Azimut AI computes a water score specific to your territory. It aggregates local rainfall (Hub'Eau), the density of resupply points (OpenStreetMap), and your onboard capacity.
Estimate your energy-autonomy potential:
Score computed in 30 seconds · PVGIS, Météo-France, ADEME data
À retenir
- Count 9 to 30 L of water per person per day depending on lifestyle: 18–30 L for comfort use, 9–17 L for minimalist.
- Size the tank with the formula (use/day × autonomy) × 1,2 — always a 20 % margin for the unexpected.
- Favour a food-grade PEHD tank; avoid non-food-grade flexible PVC and uncertified tanks.
- In a Europe van, Level 1 (sediments) + Level 2 (bacteria/viruses) filtration is enough; reverse osmosis stays reserved for boats.
- Over 5 200 motorhome points in France, complemented by campsites, town halls and apps (Park4Night, iSprings).
- Legionnaires' risk between 25 and 45 °C: a monthly chlorine disinfection protocol and a full drain when winterizing.
FAQ — Van water autonomy
How much water per person in a van?
For comfort use, 18-30 L/person/day. Minimalist, 9-17 L. Always add a 20% margin.
What tank size for 2 people?
For 4 days of autonomy at 22 L/day: (22x2x4)x1.2 = 211 L. In practice, 120 L with resupply every 2-3 days.
How do you filter stream water?
0,1 µm ceramic filter (Katadyn, Sawyer) + UV lamp if outside Western Europe.
Where can you find water by van in France?
5 200+ motorhome points, campsites, town halls, fountains (Park4Night, iSprings apps).
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