Description
The Comfort-aire MBL072ALC30C01S is a 6-ton, 14.1 EER water source heat pump package unit built for commercial and multi-family buildings that already have a water loop in place. If you've been hunting for a heavy-duty horizontal unit that handles both heating and cooling without a separate outdoor condenser, this is the answer. It runs on 460V three-phase power, mounts horizontally for tight mechanical rooms and closet installations, and ships as a complete self-contained package — compressor, coil, and controls in one cabinet.
Key Features
- 14.1 EER Efficiency: Delivers strong energy performance on water-source systems, which keeps operating costs lower than comparable air-source equipment in buildings with an existing water loop.
- 6-Ton Capacity: Handles large open-plan commercial spaces, multi-room suites, or high-load residential units — zones where smaller equipment would run short.
- Horizontal Mount, Left Return / Straight Supply: Fits mechanical closets and ceiling-hung applications where vertical units won't go — the left-return, straight-supply configuration simplifies duct connections in common commercial layouts.
- Belt-Driven Blower: Belt-driven fans let you adjust airflow at the sheave to match actual duct static pressure — a real advantage when retrofitting existing duct systems.
- 460V Three-Phase Power: Sized for commercial electrical infrastructure — three-phase power handles the motor load efficiently and keeps amperage draw manageable at this tonnage.
- 5-Year Compressor / 1-Year Parts Warranty: Comfort-aire backs the compressor for five years and covers parts for one year, so the biggest single-point failure is protected well past the first cooling season.
Is this the right unit for your project?
A 6-ton water source heat pump is designed for large zones — think 2,000 to 3,000 square feet of commercial or multi-family space, depending on ceiling height, insulation, and internal loads. It's a common fit for hotel guest floors, office suites, or large residential units in high-rise buildings tied to a central water loop. Oversizing this unit in a small zone will cause short-cycling and humidity problems; undersizing it in a high-load space leaves the building uncomfortable on peak days. Run a Manual J or equivalent load calc to confirm before ordering.
Where it fits best
- Hotel guest rooms and corridor zones on a shared building water loop
- Mid-rise and high-rise multi-family units with vertical stack or horizontal mechanical closets
- Commercial office suites requiring individual zone control on a central loop
- School or healthcare facilities with existing water-source infrastructure
- Retrofit replacements for aging water source equipment in existing commercial buildings
Why water source heat pumps outperform air source in the right building
Water source heat pumps exchange heat with a condenser water loop rather than outdoor air. That loop stays at a relatively stable temperature year-round — typically 60°F to 90°F — so the unit doesn't have to work as hard in extreme weather as an air-source system does. At 14.1 EER, the MBL072ALC30C01S takes full advantage of that stable loop temperature. In a properly designed building loop, water source systems also let you transfer rejected heat from one zone to heating in another, which cuts overall energy consumption for the building as a whole. That's why hotels, hospitals, and large multi-family developers have used water-source loops for decades.
Installation & what else you’ll need
This unit requires a 460V three-phase electrical supply — verify the building's panel capacity and wire gauge before scheduling installation. A licensed HVAC contractor must handle refrigerant connections; EPA Section 608 certification is required. Because this is a water source unit, a qualified hydronic contractor should confirm the building loop is operating within the manufacturer's entering water temperature range before startup. The belt-driven blower will need sheave adjustment to match your actual external static pressure — bring a manometer to startup. You'll also need a compatible thermostat or building control connection, isolation valves on the water connections, and properly sized supply and return ductwork matched to the left-return, straight-supply configuration. Mounting hardware and vibration isolators appropriate for a horizontal ceiling or closet installation should be sourced before the unit arrives on site.
Frequently Asked Questions
How many tons is the Comfort-aire MBL072ALC30C01S?
The MBL072ALC30C01S is a 6-ton unit. The '072' in the model number refers to 72,000 BTU per hour of nominal capacity, which equals 6 tons of cooling. That makes it one of the larger single-zone water source heat pump package units in the Comfort-aire commercial lineup.
What EER rating does the Comfort-aire 6-ton water source heat pump have?
The MBL072ALC30C01S is rated at 14.1 EER. EER measures cooling efficiency at a fixed operating condition and is the standard rating metric for water source heat pumps. A 14.1 EER is competitive for a 6-ton commercial unit on a water-source loop.
What voltage does the MBL072ALC30C01S require?
It runs on 460V three-phase power. This is a commercial-grade electrical requirement — not a standard residential panel. Confirm your building's electrical infrastructure supports 460V three-phase before purchasing, and have a licensed electrician size the disconnect and wire gauge correctly.
What is the difference between a water source heat pump and an air source heat pump?
A water source heat pump rejects and absorbs heat through a water loop instead of outdoor air. Because the loop temperature stays relatively stable year-round, water source units typically run more efficiently in extreme temperatures than air source equipment. They require an existing building water loop to operate.
What does 'left return straight supply' mean on a horizontal water source heat pump?
Left return means the return air enters the unit from the left side when you face the unit. Straight supply means conditioned air exits straight through the front or end rather than at an angle. This configuration determines how you connect ductwork — confirm it matches your mechanical room layout before ordering.
Does a water source heat pump need an outdoor condenser unit?
No. A water source heat pump is a self-contained package — the compressor, coil, and blower are all in one cabinet. It connects to a building water loop instead of an outdoor condensing unit. That's a major advantage in buildings where rooftop or ground-level condenser placement is difficult or restricted.
White Paper
- Comfort-aire MB Series Product Catalog (Part 1 of 2)
- Comfort-aire MB Series Product Catalog (Part 2 of 2)
- Comfort-aire MB Series Spec Sheet
- Comfort-aire MB Series Installation Manual (Part 1 of 3)
- Comfort-aire MB Series Installation Manual (Part 2 of 3)
- Comfort-aire MB Series Installation Manual (Part 3 of 3)
