Description
The Comfort-aire MBR120BKC30C01S is a 10-ton, 13.7 EER belt-driven water source heat pump package unit built for commercial buildings where a centralized water loop already handles the heat exchange. If you're retrofitting a mid-rise office, hotel corridor, or large commercial space and need a horizontal, right-return/straight-supply configuration that runs on 230V three-phase power, this unit fits that brief without requiring a separate outdoor condensing section. At 10 tons of capacity, it handles large zones that smaller splits simply can't cover, and the water source design keeps the mechanical room cleaner and quieter than air-cooled alternatives.
Key Features
- 10-Ton Capacity: Handles large commercial zones in a single package unit, eliminating the need to stack multiple smaller systems.
- 13.7 EER Efficiency: Water source heat exchange delivers strong energy efficiency, which adds up on commercial utility bills running year-round.
- Belt-Driven Fan: Belt-drive allows airflow adjustments at the pulley rather than replacing the motor, giving service techs real flexibility on balancing.
- Right Return / Straight Supply: Pre-configured duct orientation fits horizontal commercial installations where return and supply ducts run in a specific layout — no field fabrication needed to change the airflow path.
- 230V Three-Phase Power: Matches the electrical infrastructure already in place in most commercial buildings, avoiding costly single-phase workarounds at this capacity.
- Water Source Design: Connects to a shared building water loop instead of rejecting heat outdoors, making it practical for interior zones and multi-tenant buildings.
Is this the right unit for your project?
A 10-ton water source heat pump is sized for large commercial spaces — think open-plan offices, hotel common areas, or big conference rooms in the 3,000–5,000 square foot range, depending heavily on ceiling height, insulation, glass load, and climate. Rule of thumb: 400–500 square feet per ton is a rough starting point in commercial construction, but a proper Manual J or commercial load calculation confirms the number. Undersizing at this scale means the unit runs constantly and never catches up; oversizing causes short-cycling, humidity problems, and premature wear. This unit is not a residential fit — it requires three-phase power and an existing water loop.
Where it fits best
- Mid-rise office buildings with a central water loop
- Hotel guest corridors and common areas
- Large conference or training rooms in commercial facilities
- Retrofit projects replacing failed commercial package units in horizontal configurations
- Multi-tenant commercial buildings where outdoor condenser placement is restricted
Why water source heat pumps work in commercial buildings
In a water source system, the building's water loop does the work that outdoor air does in a conventional split system. In cooling mode, the unit rejects heat into the loop; in heating mode, it pulls heat out. Because water holds and transfers heat far more efficiently than air, the MBR120BKC30C01S achieves its 13.7 EER without the efficiency penalties you see in air-cooled units during extreme outdoor temperatures. The loop also means no outdoor condensing equipment to weather, vandalize, or code-restrict — a real advantage in urban commercial and high-rise applications.
Installation & what else you’ll need
Installation requires a licensed commercial HVAC contractor and an electrician licensed for 230V three-phase work. The unit must connect to an existing building water loop sized for 10-ton heat rejection — confirm loop capacity and flow rates with your mechanical engineer before ordering. You'll need supply and return water connections, a horizontal mounting structure or equipment frame, and duct connections matched to the right-return/straight-supply configuration. Condensate drainage must be planned for the installation location. EPA Section 608 certification is required for any refrigerant handling. Verify that the building's water loop temperature range falls within Comfort-aire's specified operating limits for this unit before commissioning.
Frequently Asked Questions
What is the EER of the Comfort-aire MBR120BKC30C01S?
The MBR120BKC30C01S is rated at 13.7 EER. That rating reflects the unit's efficiency in cooling mode using water source heat exchange, which consistently outperforms air-cooled equipment at equivalent capacity because water transfers heat more effectively than outdoor air.
How many tons is the Comfort-aire MBR120BKC30C01S?
The MBR120BKC30C01S is a 10-ton water source heat pump package unit. At this capacity, it's designed for large commercial zones — not residential or light commercial applications. Three-phase 230V power and an existing building water loop are both required.
What voltage and phase does this 10-ton water source heat pump require?
The unit runs on 230V three-phase power. This is standard for commercial buildings but rules out most residential and light commercial installations where only single-phase service is available. Confirm your electrical service before purchasing.
What does right return / straight supply mean on a commercial package unit?
Right return means return air enters from the right side of the unit; straight supply means conditioned air discharges straight out. This orientation is built into the MBR120BKC30C01S at the factory, so your duct layout needs to match — it's not field-convertible without significant modification.
What warranty comes with the Comfort-aire MBR120BKC30C01S?
Comfort-aire backs the MBR120BKC30C01S with a 5-year compressor warranty and 1-year parts coverage. Confirm registration requirements with Comfort-aire directly, as warranty terms often require the unit to be installed by a licensed contractor and registered within a specified window after installation.
Can a water source heat pump work without an existing building water loop?
No. A water source heat pump like this 10-ton unit requires a functioning water loop to operate — it has no air-cooled condenser section. Without a loop, the unit cannot reject or absorb heat. If your building doesn't have a water loop, an air-cooled package unit or split system is the right product category.
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)
