Vornado Evap40: problems, parts and running costs

Checked: 2026-10-05

Summary

The Vornado Evap40 is a 4-gallon floor-standing evaporative (wick) humidifier for large dry rooms, with three fan speeds, a mechanical humidistat and a 5-year warranty. Its recurring problems are the absence of any dry-tank protection or empty-tank indicator, fan noise on medium and high, gurgling tanks, wick clogging that is much worse on hard water, and a humidistat with no percentage scale. Wicks (part MD1-0034) every 4–8 weeks are the real running cost, and electricity is about 1.08 kWh per day on High. It is a reasonable buy below about $140 for a genuinely large room on soft water, fair around $149.99, and weak above about $175.

Common problems and fixes

No automatic shut-off when empty and no empty-tank indicator — Consumer Reports lists no empty-tank auto shut-off and no empty-tank indicator, and a retailer answer to the direct question states the unit “continues to operate even with empty tanks, so you must monitor the water levels manually.” Retailer copy advertising “automatic shut-off” means the humidistat stopping the fan at the set point, not a dry-tank cut-off. Watch tank levels yourself. [3][8]
Fan noise — on medium it is audible like a room fan and on high it is loud; the practical pattern reported is to run medium or high in the evening and drop to low overnight. [10][12]
Gurgling tanks — multiple independent owners describe a “glug glug” sound as water moves from the tanks into the base tray; it is inherent to the design, not a defect. [5][10]
Wick clogging and mineral scaling — wicks last approximately 4–8 weeks per the manual, and hard water or water with lime or iron shortens that. One reviewer felt wicks stiffen within a week or two on tap water and estimated 1–3 month replacement on hard water, while an exact-model owner reported clogging in about a week. Wicks cannot really be cleaned, only descaled with vinegar. [2][6][10]
Imprecise humidistat — the humidistat is uncalibrated in percentage terms; one reviewer had to add a separate hygrometer and dial the knob in over several days to find where it cycles around 40–45%. [10]
First-days wick odor — new wicks give off a mild odor that the manual says is expected and harmless and clears after the first few hours; a 2-teaspoons-white-vinegar-in-one-gallon soak is offered for a strong smell. [2]
Bulky and needs clearance — it is described as a bulky white plastic box that is too large for small rooms and needs 6–8 inches of space around it, plus the two tanks are heavy to carry and seat when refilling. [10][12][14]
Isolated humidistat failure — a ManualsLib questioner reports “The humidistat doesn’t seem to work. It never shut off even once the room reaches desired humidity.” This is isolated but is the exact failure the humidistat exists to prevent, and it compounds the missing dry-tank shut-off. [21]

Parts and consumables

Replacement wicks, part number MD1-0034 — two wicks are included, sold as a 2-pack, and need replacing every 4–8 weeks per the manual (sooner on hard water); no per-pack price is given in the research. [1][2]
Cleaning supplies — the manual specifies a bleach-based clean (1 teaspoon chlorine bleach in 1 gallon of water) and permits white vinegar for descaling; aroma oils and water conditioners are prohibited because they can crack the plastic and void the warranty. [2]
No fan, motor, humidistat or tank service parts were found — consumables are the only replaceable parts documented, and one owner question asks whether the fan motor can even be replaced. There is no filter cartridge. [3][21]
Replacement water tanks were not confirmed to be sold separately on any page read. [1]

Yearly running cost

Wicks are the real recurring spend: 4–8 weeks per manual, or 1–3 months on hard water, with no per-pack price given, so a precise annual dollar total is not enough data. Electricity is low — 45.1 W on High per Vornado, about 1.08 kWh per 24 hours at High and proportionally less on Low. There is no filter cartridge and no consumable electronic or water-treatment cartridge. Using distilled water is reported to cut wick replacement sharply. [1][3][10]

When it is a good buy

Prices observed on 2026-10-04 were $149.99 from Vornado direct, a $139.99 sale against a $149.99 regular price at Sylvane, $169.95 from Global Industrial, and $173.60 at a distributor; a $109.99 figure seen in a comparison widget looked stale. At $140 or below it is defensible for a genuinely large, genuinely dry room, because you are buying 4 gallons of capacity, a 5-year warranty, a mechanical humidistat and replacement wicks sold by part number. $141–150 is fair rather than good: NY Times Wirecutter’s tested evaporative pick in this brand is the smaller Vornado EV3 at about $100, preferred for circulation and cleanliness, and the Evap40’s premium over it buys tank capacity, not better measured air movement. $151–175 is weak, and above about $175 stop, because independent instrumented data for this exact model is essentially unavailable behind Consumer Reports’ paywall and the strongest independent field report called the 1,000 sq. ft. claim optimistic for an 800 sq. ft. space. The deciding variable is not price but room size plus water hardness plus noise tolerance: under about 600 sq. ft. a smaller unit is the better purchase, and next to a bed on High this one is loud. [1][3][4][8][9][10][15]