Air-to-Water Split Heat Pump Midea M Thermal Arctic 5 Ton | Montreal, Laval, Longueuil, South Shore and North Shore

Hydronic heating with a heat pump: the Midea M Thermal Arctic air-to-water split system

The Midea M Thermal Arctic air-to-water heat pump heats the water in your radiant floor, radiators or fan coils by drawing heat from the outdoor air, even in the middle of a Québec winter. We install it throughout Montreal, Laval, Longueuil, the South Shore and the North Shore, and we coordinate the whole project, from assessment to commissioning: our technicians install the heat pump, and the hydronic side is handled by a partner holding RBQ licence 15.4.

It is a split system: a DC Inverter outdoor unit connected by a refrigerant line to a compact indoor hydronic module mounted on the wall of your mechanical room. The refrigerant stays between the two units, and only the heating water circulates in the house. No water piping is exposed to freezing outdoors, a real advantage in our climate compared with a monobloc unit.

The two units that make up the system

• Outdoor unit: MHA-V16WD2MN8-B2, 16 kW nominal capacity (5 tons, 60,000 BTU designation), twin rotary DC Inverter compressor, brushless DC fan motor, electronic expansion valve.
• Indoor hydronic module: HB-A160CMDM30GN8-B2, plate heat exchanger, built-in circulation pump, 5 L expansion vessel, safety valve and a factory-mounted 3 kW electric backup element.
• Refrigerant: R-32, a new-generation refrigerant with a global warming potential (GWP 675) far below that of R-410A.
• Power supply: 208/230 V, single phase, 60 Hz.

Performance published by Midea for this pair

The figures below come from Midea's North American submittal data (M Thermal Arctic Split 16 kW, January 2026) for the exact pair MHA-V16WD2MN8-B2 / HB-A160CMDM30GN8-B2. The 5 °F (−15 °C) point with 110 °F (43.3 °C) water also matches the value listed for this model on New York State's NYS Clean Heat list of qualified air-to-water heat pumps.

Heating

• 7 °C outdoor, 35 °C water: 54,589 BTU/h (16 kW), COP of 4.5
• 2 °C outdoor, 35 °C water: 44,353 BTU/h (13 kW), COP of 3.5
• −7 °C outdoor, 35 °C water: 45,377 BTU/h (13.3 kW), COP of 2.7
• −15 °C outdoor, 43.3 °C water: 33,780 BTU/h (9.9 kW), COP of 2.06

Cooling

• 35 °C outdoor, 7 °C water (fan coils): 47,765 BTU/h (14 kW), EER of 8.37
• 35 °C outdoor, 18 °C water (cooling floor): 48,448 BTU/h (14.2 kW), EER of 12.33

In practical terms, a COP of 4.5 means one kilowatt-hour of electricity puts about 4.5 kWh of heat into your floor's water in mild conditions. At −15 °C, the system still delivers about twice as much heat as the electricity it uses, where an electric boiler or baseboards stay at one for one.

Operating ranges

• Space heating: −25 °C to 35 °C outdoor
• Domestic hot water: −25 °C to 43 °C outdoor
• Cooling: −5 °C to 43 °C outdoor
• Heating water temperature: 25 °C to 65 °C
• Cooling water temperature: 5 °C to 25 °C
• Domestic hot water: 20 °C to 60 °C (60 °C with a backup element in the tank)

Below −25 °C, and during cold snaps, the indoor module's 3 kW electric element takes over. In most homes we equip, we also keep the existing heating source as backup, or we size the loop so the heat pump covers most of the season and leaves the few extreme days to the element. We work out that calculation with you during the visit.

Why choose a Midea air-to-water heat pump with AirGreen

Made for homes heated with water

If your home is heated by a hydronic radiant floor, hot-water radiators or an oil or electric boiler, a wall or central heat pump cannot connect to your existing distribution. An air-to-water heat pump replaces or supports the boiler directly: it produces hot water, and your floors, radiators and pipes stay in place. For owners who want to leave oil without tearing everything out, it is often the most logical solution.

The built-in climate curve automatically adjusts the water temperature to the outdoor temperature. The milder it is, the cooler the water sent to the floor, and the higher the efficiency. A well-designed radiant floor running between 30 °C and 40 °C gets the most out of this type of unit.

Two zones and domestic hot water

The hydronic module manages two independent temperature zones. For example, we can feed a basement radiant floor at low temperature and upstairs fan coils at a higher temperature with a single outdoor unit. The system can also heat a domestic hot water tank, with a "fast DHW" function and a scheduled disinfection cycle against legionella. In summer, the same installation can cool the house through fan coils or, with care to prevent condensation, through the floor.

Controls and integration

• Multi-function wired controller with mobile app control
• Modbus protocol for integration with a building management system
• Terminal board compatible with 24 V zone thermostats
• "Smart Grid" function to modulate consumption according to the grid signal
• Multi-level silent mode on the outdoor unit
• Swing-out electrical box and easy-access water connections for service

Quiet and compact

The outdoor unit has a sound pressure level of 57 dB(A) at one metre, and the indoor module 35 dB(A). The outdoor unit measures about 44 in wide, 20.6 in deep and 34 in high, and weighs 97 kg. The hydronic module, 16.5 in wide, 10.6 in deep and 31.1 in high, mounts on the wall and frees up your mechanical room floor.

Installation data

• Outdoor unit: minimum circuit ampacity (MCA) 34 A, maximum fuse 50 A
• Indoor module: MCA 19 A, maximum fuse 25 A
• Refrigerant line: liquid 3/8 in, gas 5/8 in, length 2 m to 30 m, maximum height difference 20 m
• Water connections: NPT 1 in, flow 0.7 to 3 m³/h, pump head 9 m
• Factory refrigerant charge: 1.835 kg of R-32

These electrical values matter: the outdoor unit and the indoor module each have their own power supply. During the visit, we check your electrical panel capacity, the space available for the two breakers and the outdoor unit's location relative to snow buildup.

An installation that is designed, not just put in

An air-to-water heat pump is not chosen from a catalogue. The water temperature you need depends on your emitters (floor, radiators, fan coils), the home's insulation and the length of the loops. Our approach is always the same:

• Visit and heat-loss calculation for the house, room by room
• Survey of your existing hydronic system: boiler, circulators, zone valves, hot water tank
• Loop design: buffer tank if needed, hydraulic separator, glycol if part of the circuit is exposed to cold
• Heat pump installation by our technicians: outdoor unit on a raised base, refrigerant line and electrical; the hydronic connection is done by our RBQ 15.4 licensed partner, under our coordination
• Commissioning and climate curve setup for your home

Warranty and service

Midea, distributed in Québec by Descair, offers a base warranty of 5 years on the compressor and 2 years on parts, for residential and commercial use. AirGreen provides annual maintenance and after-sales service for your system, with parts available in Québec through the distributor's network.

Grants and programs

As of September 30, 2026, no program subsidizes air-to-water heat pumps: Hydro-Québec's LogisVert heat pump measure covers ENERGY STAR certified central or wall air-to-air heat pumps, Chauffez vert ended on March 31, 2026, and the Oil to Heat Pump Affordability program has not accepted applications since July 31, 2026. These programs change often: we recheck your project's eligibility for the planned installation date, and the quote states clearly what applies to your case.

Ask for your free quote

If you heat your home with a radiant floor, radiators or a boiler and want to lower your energy bill, contact AirGreen for a 100% free on-site quote. We assess your system, present the M Thermal Arctic setup that suits your home and give you a clear price, installation included, in Montreal, Laval, Longueuil, the South Shore and the North Shore.