One of the most common questions new motorhome owners ask is, “How long does a motorhome water tank last?” The answer depends on several factors, including the size of your fresh water tank, how many people are travelling, and how carefully you use your water.
In this guide, we’ll explain what affects your water supply, how long you can expect it to last, and share some simple tips to make it go further when you’re touring or camping off-grid.
The Short Answer
For most motorhomes, a full fresh water tank will last:
- 1 person: 3–5 days
- 2 people: 2–3 days
- Family of 4: 1–2 days
These estimates assume sensible water usage for washing up, cooking, drinking, brushing teeth and taking short showers.
What Size Is a Typical Motorhome Water Tank?
Most motorhomes have a fresh water tank between 80 and 120 litres, although some compact campervans may have tanks as small as 50 litres, while larger A-class motorhomes can hold over 150 litres.
Here are some typical examples:
| Tank Size | Typical Duration (2 People) |
|---|---|
| 60 litres | Around 1–2 days |
| 80 litres | Around 2 days |
| 100 litres | Around 2–3 days |
| 120 litres | Around 3 days |
What Uses the Most Water?
You might be surprised how quickly your tank can empty. The biggest water users include:
- Showering
- Washing dishes
- Flushing the toilet (if it uses fresh water)
- Cooking
- Brushing teeth with the tap running
Taking just one long shower can use 10–20 litres of water, depending on your shower head and water pressure.
How to Make Your Water Tank Last Longer
If you’re staying on a campsite without a water connection or enjoying a few days off-grid, these tips can help stretch your water supply.
Take Shorter Showers
Aim for a quick two- or three-minute shower and turn the water off while soaping up.
Use a Bowl for Washing Up
Rather than letting the tap run, fill a washing-up bowl. You’ll use much less water.
Turn Off the Tap
Whether brushing your teeth or shaving, turn the tap off whenever possible.
Carry Extra Drinking Water
Many motorhome owners carry bottled water or refillable containers for drinking. This reduces the amount taken from the onboard tank.
Check for Leaks
A dripping tap or leaking water connection can waste several litres every day without you noticing.
What About Grey Water?
Remember that every litre of fresh water you use ends up in your grey water tank (apart from toilet waste). Make sure your waste tank has enough capacity and empty it regularly.
Is It Safe to Drink Water from the Fresh Water Tank?
Yes, provided the tank is cleaned and sanitised regularly. Many owners drink directly from the onboard supply, while others prefer to use bottled or filtered water for drinking and cooking.
To keep your water fresh:
- Clean and sanitise the tank at least once or twice a year.
- Empty the system if the motorhome will be stored for several weeks.
- Use food-grade hoses when filling your tank.
- Avoid leaving water standing in hot weather for extended periods.
How Will I Know When My Tank Is Running Low?
Most modern motorhomes have a water level gauge on the control panel. Keep in mind these gauges aren’t always perfectly accurate, so it’s worth keeping an eye on your usage if you’re staying away from facilities for several days.
Frequently Asked Questions
Can I fill my water tank at any tap?
Only use drinking-water (potable) taps that are intended for fresh water. Never fill from taps marked as non-drinking water.
Can I travel with a full water tank?
Yes, but remember that water is heavy. One litre weighs approximately one kilogram, so a full 100-litre tank adds around 100kg to your motorhome. Some owners travel with a partially filled tank to reduce weight and improve fuel economy.
How often should I refill my water tank?
Most couples refill every two to three days, although this depends on how much water they use and whether they’re staying on campsites or travelling off-grid.
Final Thoughts
So, how long does a motorhome water tank last? For most couples, expect around two to three days from a typical 80–120 litre tank. By being mindful of your water use and following a few simple conservation tips, you can comfortably extend that and enjoy longer stays away from campsites.
Understanding your motorhome’s water system is an important part of confident touring, and with a little planning, you’ll never be caught short.
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