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Marley CWH340 Series Fan-Forced Wall Heater, Dual-Wattage 1-Phase
The Marley CWH340 Series Fan-Forced Wall Heater is available in two model configurations, CWH3404F and CWH3407F, delivering dependable electric supplemental heat for commercial and residential spaces. Both configurations are built as 1-Phase, fan-forced wall-mount heaters engineered for dual-wattage operation; the CWH3404F is rated 4000/3000-Watt at 240/208-Volt on its high setting and 2000/1500-Watt at 240/208-Volt on its low setting, drawing 16.7/14.5-Amp and 8.3/7.2-Amp respectively at those same voltages. The dual-wattage design gives installers and facility managers flexibility to match heat output to the room and the available electrical service.
Key Features
- Model Options: Choose from the CWH3404F or CWH3407F within the Marley CWH340 Series to match the installation's heating requirements.
- High Heat Setting (CWH3404F): Delivers 4000/3000-Watt output at 240/208-Volt for maximum heating capacity in larger or colder spaces.
- Low Heat Setting (CWH3404F): Delivers 2000/1500-Watt output at 240/208-Volt for flexible, lower-demand heating when full output is not required.
- Amperage Draw (High Setting): Draws 16.7/14.5-Amp at 240/208-Volt, supporting accurate circuit sizing and breaker selection.
- Amperage Draw (Low Setting): Draws 8.3/7.2-Amp at 240/208-Volt, allowing precise load planning on the reduced-heat setting.
- Single-Phase Power: Built for 1-Phase electrical service, simplifying installation and wiring in standard commercial and residential panels.
- Fan-Forced Operation: A fan-forced design actively circulates warm air throughout the space for more even, responsive heating than passive convection units.
- Wall-Mount Configuration: Compact wall heater design suited for point-of-use comfort heating in offices, entryways, and utility spaces.
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Commercial and Industrial Electrical Installations
- Supplemental Space Heating for Offices and Retail Spaces
- Entryways, Break Rooms, and Utility Areas
- Point-of-Use Comfort Heating
- Renovation and New Construction Projects
- Facilities Requiring Dual-Voltage (240/208-Volt) Flexibility
Why Marley?
Marley Engineered Products builds the CWH340 Series fan-forced wall heaters, offered in the CWH3404F and CWH3407F configurations, for dependable, efficient performance across commercial and residential applications. The series delivers precise dual-wattage heat output with clearly defined amperage ratings at 240/208-Volt service, supporting accurate, code-compliant electrical planning for contractors and facility managers. The fan-forced format ensures heat is actively distributed rather than left to rise passively, while the 1-Phase design keeps installation straightforward on standard branch circuits. Choose Marley for consistent, professional-grade heating performance backed by proven fan-forced engineering and the CWH340 Series' dual-setting flexibility.
Manufacturer Resources
QMark CWH3000 Wall Heater Submittal Sheet
Product Specs
- Product Type:
- Wall Heater
- Series:
- CWH340
- Configuration:
- Fan-Forced
- Department:
- Electrical
- Product Group:
- Heating
- list_batch:
- MAR-20260910
- Product Subgroup:
- Heaters
Marley CWH3404F – Frequently Asked Questions
1) Will the Marley CWH3404F wall heater run on 208-volt service, or does it need a full 240 volts?
Either one. The CWH340 Series is rated 208/240V, and the CWH3404F puts out 4000W on 240V or 3000W on 208V at its high setting. On low it is 2000W at 240V and 1500W at 208V. You lose output on 208V service but the heater is built to run on it, so there is no separate model to order for a 208V panel.
2) What size breaker and wire do I need for a Marley CWH3404F fan-forced wall heater?
Size the circuit off the high setting. The CWH3404F draws 16.7 amps at 240V and 14.5 amps at 208V on high; on low it is 8.3 amps at 240V and 7.2 amps at 208V. It's a 1-phase unit, so it lands on a standard two-pole branch circuit. Even if you plan to run it on low most of the time, size the conductors and breaker for the high-setting draw, since the switch can be moved.
3) What is the difference between the Marley CWH3404F and CWH3407F?
They are the two model configurations in the CWH340 Series, and they differ by heat output. The CWH3404F is the 4000/3000W unit at 240/208V, with a 2000/1500W low setting. Both are 1-phase, fan-forced, wall-mount units on the same 208/240V service, so the choice comes down to how much heat the space needs and what the branch circuit can carry.
4) Why would I pick a fan-forced wall heater over a baseboard or convection heater?
A fan-forced unit pushes the warm air out into the room instead of letting it rise off the element, so a space comes up to temperature faster and more evenly. That's why the CWH340 Series suits entryways, break rooms, offices, and utility spaces where you want point-of-use heat quickly. A passive convector is quieter and spreads its heat along a wall, which is a better match for a bedroom or a long exterior wall. For a cold vestibule that gets hit with outside air, the fan-forced wall unit is the one you want.
5) Can I turn down a Marley CWH340 heater if 4000 watts is too much for the room?
Yes, that is the point of the dual-wattage design. The CWH3404F can be set to its low setting at 2000W on 240V or 1500W on 208V instead of the full 4000/3000W. Useful when the existing branch circuit won't carry the full load, or when the unit is oversized for the square footage and you want to avoid short-cycling.
6) I'm ordering Marley wall heaters for a multi-unit building. What do I have to specify?
Two things: the model, CWH3404F or CWH3407F, and the voltage you're actually going to run. The heaters themselves are rated 208/240V and don't split into separate voltage SKUs, but the wattage you get depends on which supply you land on, so confirm whether the building is 208 or 240 before you pick model wattage. Standardizing on one model across the building keeps your spare parts and breaker sizing uniform.
7) Can I use the Marley CWH340 as the only heat source in a room?
It's built as supplemental electric heat for commercial and residential spaces, point-of-use comfort heating rather than a whole-building system. In a small office, entryway, or utility room it can carry the space on its own if the wattage matches the load, but for primary heating across a building you'd size a proper heating system and use units like this to cover the cold spots.
How fast can I get the Marley CWH3404F delivered?
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Does the Marley CWH3404F come with a warranty?
Absolutely. The Marley CWH3404F is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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