Plan fresh-water supply and wastewater capacity together. Tank volume alone does not establish drinking-water suitability or hot-water performance.
The fresh-water system supplies the taps and other connected fixtures. Grey water usually collects drainage from sinks and showers. Toilet waste may use a black-water tank or a removable cassette, depending on the installation.
A toilet’s flushing supply may come from the vehicle’s central system or a separate reservoir. Identify the actual arrangement before planning filling, emptying or storage.
Water capacity is not proof of potability. Source water quality, suitable components, cleaning and the applicable care instructions all matter.
A simple planning estimate is the number of people multiplied by daily use and the number of days between refills.
Example: 2 people × an assumed 15 litres per person per day × 2 days = 60 litres.
This is an illustrative allowance, not a recommended consumption figure. Shower habits, cooking, washing and drinking-water arrangements change the result. Waste capacity and access to approved disposal facilities may limit the trip before the fresh tank is empty.
Carried water also adds to vehicle weight. Include it when checking the loaded vehicle and axle limits.
A pressure-controlled pump commonly responds to demand when a tap opens. If it repeatedly cycles with all taps closed, record the symptom and check for visible leaks where accessible. The symptom alone does not identify the cause.
For hot water, check the heater’s energy source, storage volume if applicable, heating or recovery time and operating requirements. A larger fresh tank does not automatically provide longer uninterrupted hot showers.
Before operating the heater, follow its filling and start-up instructions. Use the manual for the exact installed model.
Cold-weather preparation can involve tanks, pipework, pump, heater, fittings and the toilet system. Draining one tank does not prove the entire circuit is protected.
Follow each installed component’s winterisation instructions and use only compatible treatments where specified. When returning to use, follow the cleaning, refilling and recommissioning procedure before normal operation.
These guides explain general principles. Equipment, ratings and procedures vary by model and configuration. Use the documentation supplied with your vehicle and installed components for model-specific decisions.
