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Explainers

How to read a carpet cleaner spec sheet: tank, hose, cord, heat and path

What each line of a carpet cleaner spec sheet tells you, and which ones matter for what you clean.

Updated 2026-10-26Research-based, not hands-on testedHow we compare

On this page

What we compared and why

  1. One unit per figure. Makers mix ounces, litres and gallons. We convert to ounces and feet so figures can be compared.
  2. The job you have. A whole-room machine and a spot machine are read differently: tank and path for rooms, hose for stairs and furniture.

A spec sheet, line by line

Here is what the lines on a typical maker's spec sheet mean, with a real example of each.

Line What it tells you Real example
Clean tank capacity Water (and formula) one fill holds; sets how much you clean before a refill BISSELL TurboClean 3952: 2.36 L
Dirty tank capacity What the machine can pull back before you empty it; usually smaller than the clean tank BISSELL 3952: 1.3 L
Cleaning path width The width of floor one pass covers BISSELL 3952: 7.5 in.
Power cord length How far from an outlet the machine can go BISSELL 3952: 20 ft
Hose length Reach from the machine for stairs, upholstery and car seats Hoover CleanSlate XL: 5 ft
Heating Whether the machine heats water itself BISSELL says the 3952 does not; DREAME names hot water and steam modes for the N20
Weight How heavy it is to carry, empty Often missing or unreliable in listings

Converting the units

Makers use whichever unit suits them, so convert before you compare. With the NIST conversion factors:

From To ounces (US fluid) Example
1 litre about 33.8 oz BISSELL 3952's 2.36 L is about 80 oz
1 millilitre about 0.034 oz roborock's 870 mL clean tank (on a wet-dry cleaner) is about 29 oz
1 US gallon 128 oz A one-gallon tank is 128 oz
3/4 gallon 96 oz BISSELL states the SpotClean Pet Pro's tank this way
From To feet Example
1 metre about 3.28 ft DREAME N20's 1.5 m hose is about 4.9 ft; its 4.6 m cord about 15 ft
Inches divide by 12 A 246 in. cord is 20.5 ft

Which lines matter for your job

Whole rooms of carpet (an upright): clean tank first, then path width, then cord. A larger tank and a wider path mean fewer refills and fewer passes. To compare two machines' tanks, divide the larger figure by the smaller: a 128 oz tank against a 64 oz tank is two refills of the smaller for each refill of the larger.

Stairs, sofas and car seats (a portable): hose length first, then tank, then cord. Our stairs and upholstery guide shows how to turn a hose length into the number of stair treads reached.

Small fresh spots: almost any portable tank is enough; storage and how quickly you can get the machine out matter more. See spot cleaner or full-size carpet cleaner.

"Heat" means three different things

Read the heating line carefully, because makers use similar words for different features:

  • The machine heats the water. DREAME names hot-water and steam modes for the N20.
  • The machine keeps warm tap water warm, or uses heat for drying. Hoover describes its HeatForce feature on the SmartWash+ as helping carpets dry faster, not as heating the wash water.
  • No heater at all. BISSELL's FAQ for the TurboClean 3952 says plainly that it does not heat water and that you fill it with warm tap water instead.

If heated wash water matters to you, look for a statement that the machine heats the water, not just the word "heat" in a feature name.

"Self-cleaning" means different things too

On one page it is a rinse of the hose (DREAME's N20 flushes the hose at the press of a button); on another it is a hand tool that flushes itself (BISSELL's Self-Cleaning Tough Stain Tool on the Little Green Max Pet 3860). Read what the feature cleans before you count it.

Figures that are not on most spec sheets

Suction, water lift, airflow and drying time are rarely given in comparable ways. When a page gives suction in pascals (Pa), compare it only within one maker's range, because makers measure it in their own ways.

What this page does not tell you

We do not test machines and we do not rank them. Spec sheets change; the maker's page for your exact model number is the authority.

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