Marley Q-Mark Type MUH Electri...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$945.55
Marley Q-Mark Type MUH Electric Unit Heater, 1/3-Phase, Dual-Voltage

Marley Q-Mark Type MUH Electric Unit Heater, 1/3-Phase, Dual-Voltage

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Model: MUH0521

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

$945.55
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Marley Q-Mark Type MUH Electric Unit Heater, 1/3-Phase, Dual-Voltage

The Marley Q-Mark Type MUH Electric Unit Heater is a rugged forced-air electric heater built for dependable space heating in commercial and industrial environments. This unit heater family operates on 1 or 3-phase electrical service and is available in 208-Volt or 240-Volt configurations, with amperage options ranging from 18/21-Amp up to 36/42-Amp to match a variety of heating loads. Its dual-voltage, dual-phase design gives electrical contractors flexibility when matching the heater to available building power, and the Type MUH format is well suited to mounting in occupied work areas, garages, and industrial spaces where direct forced-air electric heat is needed. Because the Q-Mark MUH Series accepts either single-phase or three-phase feeds and either 208-Volt or 240-Volt circuits across its amperage options, it can be specified for a wide variety of panel and service configurations without requiring a different model line for each electrical setup.

Key Features

  • Model Series: Q-Mark Type MUH electric unit heater.
  • Amperage Options: Offered in 18/21-Amp, 27/31.3-Amp, or 36/42-Amp ratings to match the required heating load.
  • Flexible Power Configuration: Operates on 1 or 3-phase electrical service for compatibility with a range of building power systems.
  • Dual-Voltage Design: Available in 208-Volt or 240-Volt configurations, allowing the unit to match available circuit voltage.
  • Unit Heater Construction: Type MUH design intended for direct, forced-air electric heating in occupied and work spaces.
  • Electrical Service Versatility: Dual-phase, dual-voltage rating simplifies matching the heater to the electrical service already present at a job site.
  • Series Flexibility: One heater series spans multiple amperage, voltage, and phase combinations, reducing the need to stock unrelated model lines for similar heating loads.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Commercial and Industrial Space Heating
  • Warehouses, Garages, and Workshops
  • Supplemental or Primary Electric Heat Source
  • New Construction and Retrofit Electrical Projects
  • Facilities Requiring Flexible 1 or 3-Phase Power Compatibility
  • Job Sites With Mixed 208-Volt or 240-Volt Electrical Service

Why Marley?

Marley's Q-Mark line of electric unit heaters is engineered to give electrical contractors and facility managers dependable heating options for demanding commercial and industrial spaces. The Type MUH Series' dual-voltage, dual-phase flexibility and range of amperage options simplify specification across varied electrical service configurations, and its forced-air construction is purpose-built for direct heating, making it a practical choice for professional electrical installations where matching heater ratings to available power is a priority.

Product Specs

Product Type:
Unit Heater
Voltage Rating:
208/240V
Configuration:
1/3-Phase
Amperage Rating:
18/21A-36/42A
Series:
Q-Mark MUH
Department:
Electrical
Product Group:
Heating
list_batch:
MAR-20260910
Product Subgroup:
Heaters

Marley MUH0521 – Frequently Asked Questions

1) Will the Marley Q-Mark MUH unit heater run on 208V, or do I need a 240V circuit?
Both. The Q-Mark Type MUH is a dual-voltage heater rated 208/240V, so it can be fed from either circuit voltage. That is why each amperage option carries two numbers: the first figure is the draw at the lower voltage, the second at the higher. An 18/21-Amp unit, for example, pulls 18A on one voltage and 21A on the other, and you size the branch circuit and overcurrent protection off the figure that matches the service you are actually connecting to.
2) Can this Marley MUH electric unit heater be wired to a three-phase panel?
Yes. The MUH is built for 1 or 3-phase electrical service, so it can be landed on either a single-phase or a three-phase feed at 208V or 240V. For a contractor that means one heater series covers most of the panel configurations you run into on commercial and industrial jobs instead of ordering a different model line for each service type.
3) Which amperage version of the Q-Mark MUH heater should I order?
Three ratings are offered, and they step up with the heating load: 18/21-Amp (MUH0521), 27/31.3-Amp (MUH072), and 36/42-Amp (MUH102). Pick the one your space load calls for, then confirm the branch circuit can carry the amp figure that corresponds to your actual supply voltage. The larger ratings draw enough current that the feeder, not the heater, is usually the limiting factor on a retrofit.
4) Is the Marley MUH a forced-air heater or a radiant type?
Forced air. The Type MUH is a fan-driven electric unit heater that blows heated air directly into the space, which is what makes it suited to warehouses, garages, workshops, and other work areas where you want air movement and quick recovery rather than the surface warming you get from a radiant panel.
5) I manage several buildings with mixed 208V and 240V service. Can I standardize on one unit heater?
That is the practical argument for the Q-Mark MUH family. Because the same series accepts either 208V or 240V and either single-phase or three-phase feeds across all three amperage ratings, a facility with mixed service can stock one model line rather than separate heaters for each electrical setup. You still match the amperage rating to the load in each space.
6) What is the part number for the largest Marley Q-Mark MUH unit heater?
MUH102 is the top of the three, rated 36/42-Amp. Below it are MUH072 at 27/31.3-Amp and MUH0521 at 18/21-Amp. All three are the same Q-Mark Type MUH series and share the 208/240V, 1 or 3-phase electrical flexibility.
How fast can I get the Marley MUH0521 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 MUH0521 come with a warranty?
Absolutely. The Marley MUH0521 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 MUH0521?
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 MUH0521 from ZenSupply?
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