Levoit LV600S vs Honeywell HEV685W: Smart Humidifier vs Easy-Fill Classic

The Levoit LV600S and Honeywell HEV685W sit at the same price point but represent two completely different approaches to home humidification. The Levoit is a smart ultrasonic humidifier that offers warm and cool mist, Wi-Fi app control, and precise humidity targeting. The Honeywell is an evaporative humidifier with a brilliantly simple top-fill design that makes maintenance effortless — no app needed, no complexity, just reliable moisture output.

This is not a question of which is "better." It is a question of which technology and feature set matches how you actually want to use a humidifier. Based on our research into published specifications, customer reviews, and expert analysis, here is the full comparison.

Quick Decision Guide

Full Specs Comparison

Technology: Ultrasonic vs Evaporative

This is the most fundamental difference between these two humidifiers, and understanding it clarifies nearly every other comparison point.

Levoit LV600S: Ultrasonic Technology

Ultrasonic humidifiers use high-frequency vibrations to break water into a fine mist that is dispersed into the air. The Levoit LV600S can produce both cool mist and warm mist (the water is heated before misting).

Advantages of ultrasonic:

• Can produce warm mist, which feels more comfortable in winter and may help with congestion
• Higher mist output — up to 500 mL/hr for faster humidification
• No replacement filters required (optional demineralization cartridge available)
• Quieter at higher output settings

Disadvantages of ultrasonic:

• Can produce "white dust" — mineral deposits from tap water that settle on surfaces
• Can over-humidify a room if run without humidity control
• Requires more frequent cleaning to prevent bacterial growth in standing water
• Warm mist involves heated water, which is a minor safety consideration around children

Honeywell HEV685W: Evaporative Technology

Evaporative humidifiers draw air through a wet wicking filter, allowing water to evaporate naturally. The output is invisible — there is no visible mist.

Advantages of evaporative:

• Cannot over-humidify — evaporation naturally slows as room humidity rises
• Produces zero white dust, regardless of water type
• Wicking filter catches minerals and some bacteria
• No heated water — safer around children and pets
• Self-regulating output adjusts to room conditions

Disadvantages of evaporative:

• Cool mist only — no warm mist option
• Wicking filter requires regular replacement ($15 every 1-3 months depending on water hardness)
• Fan noise is slightly more noticeable than ultrasonic at comparable output
• Lower maximum output compared to ultrasonic

Smart Features: Levoit Wins Decisively

The Levoit LV600S connects to the VeSync app over Wi-Fi, providing:

• Remote control — Turn the humidifier on/off, adjust mist level, and switch between warm and cool from your phone or couch
• Humidity targeting — Set a target humidity (e.g., 45%) and the humidifier adjusts output automatically
• Scheduling — Program on/off times for overnight use or workday schedules
• Timer — 1 to 12 hour countdown timer
• Alexa and Google Assistant — Voice commands for hands-free control
• Sleep mode — Reduces display brightness and operates at minimum noise

The built-in humidity sensor enables a true auto mode that measures current room humidity and adjusts mist output to maintain your target level. Customer reviews indicate the sensor is reasonably accurate, typically within 3-5% of standalone hygrometers.

The Honeywell HEV685W has no app, no Wi-Fi, and no voice assistant support. It offers a basic analog humidistat dial that lets you set a rough target humidity, and the unit adjusts fan speed between two levels. The controls are simple — a power button, fan speed toggle, and humidistat dial. That is it.

If app control, scheduling, and precise humidity management matter to you, the Levoit is the only option. If you just want to turn on a humidifier and let it run, the Honeywell's simplicity is a feature, not a limitation.

Ease of Use and Maintenance

Refilling

Honeywell wins on refilling convenience. The HEV685W's top-fill design is its standout feature. To refill, you simply open the top and pour water directly into the tank — no removing heavy, sloshing water tanks, no carrying them to a sink, no mess. It is the most user-friendly refilling experience available in any humidifier.

The Levoit LV600S also offers top-fill capability, plus a removable tank that can be carried to a sink for filling. Both methods work, but the tank is larger (6 liters) and heavier when full. Customer reviews note that the top-fill option on the Levoit is convenient, but the Honeywell's implementation is simpler since the entire unit is designed around it.

Cleaning

Levoit requires more cleaning attention. Ultrasonic humidifiers need weekly cleaning of the tank and base to prevent bacterial growth and mineral buildup. Without regular cleaning, they can disperse bacteria and mold into the air along with the mist. Using distilled water reduces mineral buildup but does not eliminate the need for cleaning.

The Honeywell's evaporative design is more forgiving. The wicking filter naturally captures minerals, and the fan-driven evaporation process is less prone to bacterial dispersion. However, the wicking filter itself needs periodic replacement — typically every 1-3 months depending on water hardness and usage. Neglecting filter changes leads to reduced output and potential odor.

Ongoing Costs

The Levoit has no mandatory replacement parts, making it cheaper to operate over time. However, using distilled water (recommended to avoid white dust) adds cost. The Honeywell's wicking filters are a recurring expense that varies significantly based on water hardness and usage frequency.

Noise Comparison

On the lowest setting, both humidifiers are bedroom-suitable. The Honeywell is 3 dB quieter on low — essentially the difference between inaudible and barely audible in a quiet room. On high, the Levoit is notably quieter (36 dB vs 40 dB), because ultrasonic technology produces less mechanical noise than the Honeywell's fan-driven evaporation.

For bedroom use on low settings, both are excellent. Customer reviews confirm that both can run overnight without disturbing sleep. If you plan to use high output frequently (very dry climates or large rooms), the Levoit's quieter high setting is an advantage.

Room Coverage and Runtime

Levoit wins on both coverage and runtime. The LV600S covers up to 753 sq. ft. with its 6-liter tank lasting up to 50 hours on low cool mist. This is enough to run for two full days without refilling in moderate conditions.

The Honeywell covers up to 500 sq. ft. with its smaller 1-gallon tank lasting up to 24 hours on low. For typical bedrooms (200-300 sq. ft.), this is perfectly adequate. For larger living areas, the Levoit's greater coverage and larger tank are meaningful advantages.

Runtime on warm mist (Levoit only): Warm mist uses more water and energy. Expect approximately 18-25 hours on warm mist mode, depending on output level. Warm mist is best used periodically — during cold and flu season or on particularly cold nights — rather than continuously.

Safety Considerations

Honeywell is safer for homes with young children. The Honeywell HEV685W uses no heated water. The mist output is invisible evaporated moisture at room temperature. There is zero burn risk.

The Levoit LV600S's warm mist mode heats water internally. While the exterior stays cool and the mist cools quickly after leaving the unit, the internal heating element and warm water in the tank pose a theoretical risk if a child were to reach inside or tip the unit. The warm mist outlet also emits noticeably warm vapor. For nurseries and children's bedrooms, the Honeywell's evaporative design is the safer default choice.

On cool mist mode, both units are safe. The concern applies only to the Levoit's warm mist function.

Who Should Buy Which

Buy the Levoit LV600S if:

• You want smart app control and the ability to set precise humidity targets
• Warm mist during winter or cold and flu season is important to you
• You need to cover a large room (500-750 sq. ft.)
• You want the longest runtime between refills (up to 50 hours)
• You are willing to clean weekly and use distilled water to avoid white dust
• You want to use essential oils (the Levoit has a built-in aroma tray)
• You prefer no recurring filter costs

Buy the Honeywell HEV685W if:

• You want the easiest possible refilling — just pour water in the top
• You have young children and want zero burn risk from heated water
• You do not want to deal with white mineral dust on your furniture
• You prefer set-it-and-forget-it operation without apps or smart features
• Your room is under 500 sq. ft.
• You want evaporative technology that cannot over-humidify your space
• You value the longer 3-year warranty (vs Levoit's 2-year)

The Bottom Line

At the same price point, the Levoit LV600S and Honeywell HEV685W offer remarkably different value propositions.

The Levoit LV600S is the feature-rich choice: warm and cool mist, app control, large tank, long runtime, and precise humidity management. It is the humidifier for users who want control and capabilities. The tradeoff is more maintenance and the potential for white dust if you do not use distilled water.

The Honeywell HEV685W is the simplicity choice: top-fill convenience, evaporative technology that self-regulates and produces no white dust, and safe operation around children. It is the humidifier for users who want reliability without complexity. The tradeoff is recurring filter costs and no smart features.

Based on customer reviews, both are highly rated and well-regarded in their respective categories. You will not be disappointed with either — the right choice is the one that matches your lifestyle.