Marley Q-Mark M602W Line Volta...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$45.46
Marley Q-Mark M602W Line Voltage Thermostat

Marley Q-Mark M602W Line Voltage Thermostat

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Model: M601W

In Stock (leaves warehouse same day if ordered before 3pm ET)

$45.46
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Marley Q-Mark M602W Line Voltage Thermostat, 120/208/240/277-Volt, White

The Marley Q-Mark M602W Line Voltage Thermostat is a direct line voltage control built to manage electric heating equipment without the need for a separate low-voltage transformer or control relay. Rated for 120/208/240/277-Volt service, this thermostat gives electrical contractors a single device that can be matched to whatever line voltage is present on the circuit, simplifying stock and specification across mixed-voltage jobs. Finished in White, the M602W mounts cleanly alongside standard wall plates and other Marley and Q-Mark heating controls. As part of the Q-Mark control lineup from Marley Engineered Products, the M602W is intended for straightforward, dependable temperature control on electric heating loads in both residential and commercial settings.

Key Features

  • Multi-Voltage Rating: Listed for 120/208/240/277-Volt service, letting one thermostat model cover several common line voltage circuits instead of stocking a separate control for each voltage.
  • Direct Line Voltage Switching: Switches line voltage directly to the connected heating equipment, so no separate low-voltage transformer or control relay is required in the circuit.
  • White Finish: A clean White finish coordinates with standard wall plates and most interior color schemes, keeping the control visually unobtrusive.
  • Q-Mark M602W Model: Identified by the Q-Mark M602W model designation, part of the Marley Engineered Products control lineup used alongside Q-Mark electric heating equipment.
  • Single-Device Simplicity: A single thermostat model spanning 120/208/240/277-Volt service reduces the number of SKUs an electrical contractor needs to carry for line voltage heating control jobs.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Electric Baseboard Heater Control
  • Fan-Forced Wall Heater Control
  • Unit Heater and Garage or Shop Heater Control
  • Renovation and New Construction Electric Heating Circuits
  • Commercial and Residential Line Voltage Heating Systems

Why Marley?

Marley Engineered Products, through its Q-Mark line, focuses on dependable controls for electric heating equipment. The M602W's broad 120/208/240/277-Volt rating and direct line voltage switching make it a practical choice for electricians and contractors standardizing on a single thermostat across mixed-voltage heating circuits, rather than stocking multiple voltage-specific controls. Choosing a Marley Q-Mark thermostat keeps heating system controls under one recognized manufacturer name alongside the Q-Mark heaters they are commonly paired with.

Manufacturer Resources

QMark Digital Catalog 2025

Product Specs

Product Type:
Thermostat
Voltage Rating:
120/208/240/277V
Product Color:
White
Department:
Electrical
Product Group:
Heating
list_batch:
TOPAZ-20260727
Product Subgroup:
Thermostats

Marley M601W – Frequently Asked Questions

1) Will a Marley Q-Mark M602W thermostat work on a 240V baseboard circuit, or do I need a voltage-specific model?
One model covers it. The Q-Mark M602W line voltage thermostat is rated 120/208/240/277V, so the same control works on a 240V baseboard circuit as well as 120V, 208V, and 277V heating circuits. That is the point of the multi-voltage rating: an electrician carries one thermostat instead of four voltage-specific ones.
2) Does a Q-Mark M602W thermostat need a transformer or relay to control an electric heater?
No. The M602W switches line voltage directly to the connected heating equipment, so there is no separate low-voltage transformer or control relay in the circuit. The heater's supply conductors land at the thermostat and the thermostat makes and breaks the load itself. If your heater is wired for low-voltage (24V) control instead, this is the wrong type of thermostat for it.
3) What is the difference between the Marley Q-Mark M601W and M602W thermostats?
They are the two models in the same white Q-Mark line voltage thermostat family, ordered as M601W and M602W. Both are selected by model number on the order, and the M602W is rated 120/208/240/277V for line voltage heating control. Specify the model your heater's wiring calls for, since the two are not interchangeable designations.
4) Can I use a Marley Q-Mark line voltage thermostat on a fan-forced wall heater or a garage unit heater?
Yes, both are intended uses. The M602W is applied to electric baseboard, fan-forced wall heaters, and unit heaters including garage and shop heaters, on residential and commercial line voltage heating circuits. Size the thermostat to the heater's amp draw on the circuit it is switching, since a line voltage control carries the full heater load.
5) Is a line voltage thermostat like the Q-Mark M602W the right choice, or should I use a low-voltage thermostat?
Pick a line voltage control like the M602W when the heater is a standalone electric unit, baseboard, wall heater, or unit heater, fed from its own 120, 208, 240, or 277V circuit. It switches that circuit directly, which means no transformer and no relay to install. A low-voltage thermostat is the right call when you are controlling a system that already has a 24V control board or when you want one stat driving several zones through relays.
6) I'm standardizing thermostats across a building with mixed 208V and 277V heating circuits. Can one model cover both?
Yes. Because the Q-Mark M602W is listed for 120/208/240/277V service, the same thermostat goes on the 208V circuits and the 277V circuits, which is what makes it workable for an MRO or multi-family buyer trying to hold one line item instead of a control per voltage. Verify each heater's load rating against the thermostat you install at the panel schedule stage.
7) What color is the Q-Mark M602W thermostat, and will it blend with my existing wall plates?
White. The M602W is finished in white so it sits with standard white wall plates and the rest of the Q-Mark heating controls on the wall. For a property manager replacing one control in a run of units, that keeps the openings looking consistent without repainting or swapping plates.
How fast can I get the Marley M601W delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Marley M601W come with a warranty?
Absolutely. The Marley M601W is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Marley M601W?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Marley M601W from ZenSupply?
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