Mitsubishi MLZ-KX18NL & SUZ-AA18NLHZ 18,000 BTU 17.2 SEER2 One-Way Ceiling Cassette Hyper Heating Heat Pump System (w/ Grille) - R454B

Mitsubishi MLZ-KX18NL & SUZ-AA18NLHZ: 18,000 BTU Ceiling-Cassette Hyper-Heating Heat Pump System

The Mitsubishi MLZ-KX18NL & SUZ-AA18NLHZ is a high-capacity, 18,000 BTU 1-way ceiling cassette heat pump system engineered for reliable year-round performance and discreet ceiling installation. With advanced Hyper-Heating INVERTER® (H2i®) technology, it provides full-rated heating at 5°F and dependable operation in outdoor temperatures as low as -13°F. The MLZ-KX18NL indoor unit installs flush between standard ceiling joists for a low-profile appearance, while the SUZ-AA18NLHZ outdoor unit features Blue Fin coil protection and inverter-driven efficiency for superior durability and performance.

Perfect for large spaces up to ~750 sq ft, this single-zone system delivers quiet comfort, customizable airflow, and smart control options—all in a compact, ceiling-mounted design.

General Information

System Type: 1-Way Ceiling Cassette Indoor Unit + Hyper-Heating Outdoor Unit
Model Numbers: Indoor – MLZ-KX18NL / Outdoor – SUZ-AA18NLHZ
Capacity: 16,400 BTU Cooling / 18,400 BTU Hyper-Heating (Up to 21,000 BTU)
Ideal Room Size: ~750 sq ft
Operating Mode: Heating & Cooling
Energy Star Certified: Yes
Refrigerant: R454B (Factory-charged)

Key Features

Hyper-Heating INVERTER® (H2i®) Technology
Delivers full heating at 5°F and maintains operation at -13°F outdoor temperatures.

EZ FIT Ceiling Installation
Slim cassette fits between standard 16" ceiling joists for seamless, grille-only visibility.

Built-in Condensate Lift Pump
19.6" vertical lift simplifies installation and drainage.

Quiet Comfort
Indoor sound levels as low as 30 dB(A), perfect for bedrooms, offices, and living rooms.

Blue Fin Protection
Coating on outdoor coils defends against corrosion in coastal and humid environments.

Advanced Filtration
Washable antibacterial and deodorizing filters improve air quality.

Smart Comfort Control
Compatible with Mitsubishi Comfort App, IR remote, and wired wall controllers.

Hot-Start & Auto Vane
Prevents cold drafts and ensures even air distribution.

Specifications

Cooling Capacity: 16,400 BTU
Heating Capacity: 18,400 BTU Rated / 21,000 BTU Max
EER2: 11.7
HSPF2: 9.5
COP @ 47°F: 3.3
COP @ 17°F: 1.9
Voltage: 208/230V, 1-Phase, 60Hz
Airflow Rate: 212-403 CFM (Cooling)
Indoor Sound Levels: 29-47 dB(A) (Cooling), 26-48 dB(A) (Heating)
Piping: 1/2 in. (Gas) / 1/4 in. (Liquid)

Included Components

Indoor Unit: MLZ-KX18NL
Grille: MLP-449W
Outdoor Unit: SUZ-AA18NLHZ
Controller: Hand-held IR Remote

Optional Accessories

Indoor Unit: Wi-Fi Interface, Wired Wall Controller, Enhanced Air Filter, CN24 Relay Kit
Outdoor Unit: Base Pan Heater, Drain Socket, Wall-Mount Bracket, Air Outlet Guide

Ideal For:
Homeowners and commercial users seeking a high-performance, ceiling-mounted hyper-heating solution with smart controls, whisper-quiet comfort, and energy-efficient operation for rooms up to 750 sq ft