Quest 335 High-Efficiency Dehumidifier - QU12521

Quest 335 High-Efficiency Dehumidifier - 208/230V - R454B - QU12521

Quest

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Model

QU12521

199391

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Product Features

High-efficiency dehumidifier for large commercial spaces
208/230V operation for flexible industrial use
Uses R454B refrigerant for efficient performance
Helps control humidity and prevent moisture damage

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Description

The Quest 335 High-Efficiency Dehumidifier – 208/230V (SKU: QU12521 / Model 4046200) is a commercial-grade, high-capacity moisture control system engineered for large industrial, agricultural, and controlled-environment applications. Designed for continuous-duty performance, it delivers powerful dehumidification while maintaining exceptional energy efficiency in demanding environments.

With a moisture removal capacity of up to 345 pints per day under standard conditions, the Quest 335 is ideal for warehouses, indoor agriculture facilities, water treatment spaces, restoration projects, and other large humidity-sensitive environments. It operates on 208/230V power and utilizes R454B refrigerant combined with Quest’s patented M-CoRR multi-coil refrigeration technology to maximize efficiency while reducing heat output.

This dehumidifier is built for flexible installation and can be mounted overhead or placed on the floor depending on application requirements. Integrated digital controls, high airflow performance, and continuous operation capability make it a reliable solution for professional humidity management systems.

Product Features:

345 PPD Moisture Removal Capacity: High-output dehumidification for large commercial and industrial environments.
208/230V Operation: Designed for commercial electrical systems with efficient low-amperage performance.
R454B Refrigerant System: Environmentally improved refrigerant technology with lower global warming potential.
M-CoRR Multi-Coil Technology: Patented refrigeration design that improves efficiency and reduces excess heat output.
High Airflow Performance: Approximately 900 CFM airflow supports effective humidity control in large spaces.
Flexible Installation Options: Can be mounted overhead or installed as a freestanding unit.
Integrated Digital Controls: Onboard digital interface supports precise humidity adjustment and monitoring.

Warranty

The Quest 335 (4046200) typically includes a 5-year limited manufacturer warranty, depending on distributor and installation conditions. Refer to official Quest documentation or an authorized dealer for complete warranty details.

Product Specifications

More Information
Quest 335 High-Efficiency Dehumidifier - QU12521
Feature	Spec
SKU	QU12521
Weight (in lbs)	215.000000
Brand/Manufacturer	Quest
Included Items	Dehumidifier (1), feet (4), drain hose (1), drain adapter (3/4” NPT PVC to 5/8” hose barb), rivnut plugs (4)
Additional Information	Auto-Restart
Additional Information	Number of Fan Speeds: 3
Additional Information	Energy Factor: 4.4 L/kWh
Additional Information	Certification: UL
Heating BTU	15,700
Maximum CFM	900 CFM
Refrigerant	R454B
Capacity	345 pints
Wattage	1700 W
Max Breaker Size	7.9 Amps / 6.9 Amps
Height	23.7"
Width	24.6"
Depth	32.9"
Pint Capacity	200+
Usage	Gyms/Fitness Centers, Indoor Growing/Greenhouses, Kennels/Stables, Warehouses, Ducted
Additional Info	Cabinet Width: 24.6"
Warranty	5-Year Limited Warranty
Resources	Catalog Specifications Sheet Owner's Manual You will need Adobe® Acrobat® Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.

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Questions and Answers

Customer Questions

Who Makes Quest?

Quest dehumidifiers are proudly manufactured in the United States, specifically in Madison, Wisconsin. This is the home base of Therma-Stor LLC, the company behind the Quest brand. Therma-Stor has built a strong reputation in the HVAC and indoor air quality industries for producing high-performance, durable, and energy-efficient dehumidification systems.

Is installation difficult or do I need a professional?

While many Quest units are plug-and-play, larger models or those requiring overhead mounting may need a professional HVAC technician for safe and proper installation.

How do I know which Quest dehumidifier model is right for my space?

Start by measuring the square footage and ceiling height of your space. Then, consider moisture levels and how often the area is in use. Quest offers models with capacities ranging from around 70 to over 500 pints per day, so there’s an option for everything from small grow rooms to large industrial spaces.

What kind of maintenance is required?

Routine maintenance includes checking and replacing filters regularly, inspecting drainage lines, and cleaning the coils periodically. Most users find the upkeep simple and manageable.

How often do I need to clean or change the filter?

Most customers check the filter every 1–3 months. Depending on dust levels and usage, you may need to clean or replace it quarterly.

What is the warranty on Quest dehumidifiers?

Quest dehumidifiers come with a 5-year warranty on parts and refrigerant system components, offering long-term reliability and peace of mind.

How noisy are Quest dehumidifiers?

Noise levels vary by model, but most units are quiet enough for use in occupied commercial spaces. For grow rooms and workspaces, the sound is often comparable to a running HVAC system.

Can I run the dehumidifier continuously?

Yes, most Quest dehumidifiers are built for continuous operation. They include features like automatic defrost and humidity set points to maintain consistent performance without constant supervision.

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