Air/water heat pump 33NM3

residentialoutdoorsplit

Overview
The Carrier 33NM3 air-to-water heat pump is an integrated solution for domestic hot water (DHW) and space conditioning. Supplied as a package including indoor unit, outdoor unit, buffer tank and domestic hot water tank, it is designed to simplify installation in new build and retrofit projects while offering flexible application options: forced-air systems, radiant heating, driveway snow-melt or mixed hydronic systems. The system supports pairing with a furnace or boiler via a dual-fuel switch and includes integrated auxiliary electric heat within the indoor unit.

Features

• Energy performance: Up to 4.9 COP and 16.8 EER for efficient year-round operation.
• Variable-speed compressor: Modulates capacity to maintain stable temperatures and improve part-load efficiency.
• Humidity management: Extended low-speed operation improves indoor humidity control for occupant comfort.
• Low sound levels: Rated down to 52 dB for quiet indoor and outdoor operation.
• Integrated package: Pre-configured indoor/outdoor units with buffer and DHW tanks reduce on-site piping and installation time.

Refrigerant
The 33NM3 uses R-32 refrigerant with a global warming potential (GWP) of 675 kg CO2e.

Warranty
Compressor (outdoor unit): 5 years. Indoor and outdoor units: 3 years. Fittings: 1 year. Buffer tank: 5 years. Buffer tank parts/accessories: 2 years. Water heater tank, coil and heat exchanger: 10 years. Water heater tank parts/accessories: 2 years. Warranty transfers to subsequent owners for the remainder of the original term.

At a glance
Energy Efficiency: Up to 4.9 COP and 16.8 EER
Sound Level: Down to 52 dB
Compressor: Variable-speed
Refrigerant: R-32 (GWP 675 kg CO2e)
Sizes: Available in three sizes to suit most homes

Technical specifications

• Model designation: 33NM3
• Included components: Indoor unit, outdoor unit, buffer tank, domestic hot water tank (integrated package)
• Performance: Up to 4.9 COP; up to 16.8 EER
• Compressor: Variable-speed for modulation and improved part-load efficiency
• Sound level: Down to 52 dB
• Refrigerant: R-32 (GWP 675 kg CO2e)
• Installation: Designed for installation without additional hydronic components; suitable for new build and retrofit
• Compatibility: Can be paired with a furnace or boiler via dual-fuel switch; indoor unit includes auxiliary electric heat
• Applications: Forced-air heating/cooling, radiant systems, driveway heating, mixed hydronic applications
• Sizes: Available in three sizes to cover most residential needs
• Warranty summary: Compressor (outdoor) 5 years; indoor & outdoor units 3 years; fittings 1 year; buffer tank 5 years; buffer tank parts/accessories 2 years; water heater tank/coil/heat exchanger 10 years; water heater tank parts/accessories 2 years