What Size Water Tank Do I Need for Window Cleaning?
Choosing the right water tank size is one of the most important decisions when building a window cleaning van. Too small and you'll constantly run out of water. Too large and you'll carry unnecessary weight every day.
Quick Answer
For most single-operator domestic window cleaners, a 350L to 500L tank is ideal. Dual operator systems typically benefit from 650L to 1000L tanks, depending on daily workload and water usage.
Why tank size matters
Your water tank determines how much work you can complete before needing to refill.
Tank size affects:
- Daily working range
- Vehicle payload
- Water production requirements
- Hot water system suitability
- Future business growth
Common window cleaning tank sizes
| Tank Size | Typical Use |
|---|---|
| 250L | Part-time or small domestic rounds |
| 350L | Single operator domestic work |
| 500L | Heavy single operator workload |
| 650L | Single or light dual operator use |
| 800L+ | Dual operator systems |
| 1000L | Large commercial or dual operator work |
How much water does a window cleaner use?
Actual water consumption varies depending on flow rate, brush type, cleaning style and job type.
However, most professional window cleaners are surprised how quickly water usage increases when moving from one operator to two.
This is why future growth should be considered when selecting a tank.
Remember the weight
Important
One litre of water weighs approximately one kilogram.
A full 500L tank weighs roughly 500kg before you add reels, pumps, batteries, hot water equipment, tools and the driver.
Single operator tank recommendations
- 250L – Light domestic workload
- 350L – Most common domestic setup
- 500L – Busy daily rounds
- 650L – Long working days or future growth
For most owner-operators, a 350L to 500L tank is the sweet spot.
Dual operator tank recommendations
- 650L – Light dual operator work
- 800L – Most dual operator setups
- 1000L – Heavy daily usage
When two operators are working simultaneously, water consumption can increase dramatically.
What if I want hot water?
Hot water systems such as Pure Heat do not necessarily require larger tanks, but they do increase the importance of planning your water supply correctly.
The more productive your cleaning becomes, the more important water availability becomes.
Should you buy bigger than you need?
Sometimes yes.
Many successful operators outgrow their first tank. If you are planning to employ staff, add a second operator or move into commercial work, a slightly larger tank can save money later.
However, oversizing a tank can create payload problems and unnecessary vehicle weight.
PWS Tip
Buy for where your business will be in 12-24 months, not just where it is today.
Summary
Most single operator window cleaners are best served by a 350L to 500L tank. Dual operator systems typically require 650L to 1000L depending on workload.
The ideal tank balances daily water requirements, vehicle payload and future business growth.
Planning a new van build?
Speak to Precious Washers about tanks, reels, pumps, Pure Heat hot water systems and complete professional window cleaning van setups.
Contact PWS →