Venta humidifiers
Venta has 2 units here, from $330 to $450, across one type. The most capable is the Venta LW45 Comfort Plus at 3 gal/day, enough for 739 sq ft. 2 of the 2 cannot produce white dust.
Across the lineup, Venta's published room sizes average 0.87× what the output supports — which is to say they match. Very few makers here do. How that is calculated.
The LW25's larger sibling, and the one where Venta does publish a figure: three gallons a day from a three-gallon reservoir, which is a true 24 hours between fills at full output. That is a rare and honest pairing - almost every unit in this catalog quotes a runtime from one setting and a room size from another. Three gallons a day supports about 740 square feet against Venta's 645, so the claim is conservative. Eight watts, no wick, ten-year warranty, and a basin you will have your hands in every couple of weeks.
739 sq ft supported · box says 645 sq ft
Ten-year warranty, eight watts at full speed, no wick and no filter - Venta's disc-stack airwasher is built to a standard that makes the price make sense over a decade rather than a season. Its manual is also the only one in this catalog that states the assumption behind its room-size figure: "listed square feet are based on 8-foot ceilings". That single sentence is more transparency than the rest of the category manages combined. What Venta will not tell you is how much water it actually moves - no output rate appears in the manual or on the product page - so the 485 sq ft figure has nothing behind it that a buyer can check.