Published 2026-11-15, updated 2026-11-15, by the Maclean team in Suzhou
Floor Washer Tank Sizes: Clean Tank, Dirty Tank and What They Mean for Buyers
Short answer: On our cordless floor washers the clean water tank runs from 400 ml on the GT3 to 850 ml on the GT6, and the dirty tank from 400 ml to 500 ml. A bigger clean tank means fewer refills in one session and more weight in the hand. The tanks are part of each model's fixed design, so you choose a tank size by choosing the model.
Tank size is one of the first numbers buyers compare on a floor washer, next to suction and runtime. This guide puts the tank sizes of our four models side by side and explains what each number means in daily use.
Tank sizes on our four models
| GT6 | GT8 series | GT9 series | GT3 | |
|---|---|---|---|---|
| Clean water tank | 850 ml | 485 ml | 500 ml | 400 ml |
| Dirty water tank | 500 ml | 400 ml | 450 ml | 500 ml |
| Runtime, high / low | 30 / 40 min | 35 / 45 min | 35 / 45 min | 36 / 48 min |
| Net weight | 3.98 kg | 3 kg | 3.4 kg | 3.5 kg |
| Units per 20GP | 288 | 681 | 456 | 710 |
The GT6 has the largest clean tank in our range. It is also the heaviest model, and it has the fewest units per container because its package is the largest.
Clean tank: refills against weight
The clean tank sets how often the user stops to refill in one session. Net weight on a spec sheet is the empty machine. With a full clean tank, the GT6 carries about 0.85 kg of water on top of its 3.98 kg, and the GT3 about 0.4 kg on top of its 3.5 kg.
For customers with large hard floor areas, the GT6 means fewer refills. For customers who care most about a light machine, the GT8 series at 3 kg is the lighter choice. The GT9 series sits between the two.
Dirty tank: what it collects
The dirty tank collects the used water and the dirt the roller picks up. On the GT3 the dirty tank is larger than the clean tank, 500 ml against 400 ml. The GT3 also has solid and liquid separation.
Used water left in the tank overnight can smell. Tell your customers to empty and rinse the dirty tank after each session, also after a self-cleaning cycle on the GT6, GT9 and GT3.
What to check on your sample
- Fill the clean tank to the max line and measure the water. Compare it with the number on your listing.
- Run one full session on a hard floor and count the refills.
- Take the dirty tank out, empty it and rinse it. Your customers will do this after every use.
- Weigh the machine empty and again with a full clean tank.
- Leave the machine on its dock overnight after use, then check the dirty tank and the roller for smell.
Tank size stays fixed on each model
We supply these models as OEM with your logo, body colour and colour box. The tanks are part of the housing, so the tank size stays as it is. For a different tank size, choose a different model. A branded sample takes 10 days.
Full specs for each model are on our floor washers page. Our sample checklist has 12 checks for a floor washer sample, and our quote request guide shows what to send for a price.
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See also: Factory, Carpet Cleaners, Container loading calculator.