The Mitsubishi ERSF-NM6E Hydrobox and WUZ-SA48NMZ Ecodan Air-to-Water Heat Pump deliver efficient hydronic heating and hot water using advanced inverter technology. This 48,000 BTU system transfers heat from outdoor air to water, providing reliable, energy-efficient comfort for radiant floors, fan coils, and domestic hot water systems.

Heat Pump Type: Air to Water
Hydrobox Mandatory: yes
BTU Size: 48,000 BTU
Gas Pipe Size: 5/8"
Liquid Pipe Size: 1/4"
Recommended Fuse/Breaker Size, ODU + hydrobox (without
booster heater): 40 AMPS

Mitsubishi WUZ-SA48NMZ
Mitsubishi ERSF-NM6E Hydrobox
Booster Heater Included
Expansion Vessel Included

Heating Water Temperature Range [Minimum / Maximum]: 77F / 158F
Maximum Capacity at A45W95 : 49,130 BTU
COP at A45W95: 3.57
Maximum Capacity at A35W95: 49,820 BTU
COP at A35W95: 2.98
Maximum Capacity at A5W95: 48,450 BTU
COP at A5W95: 2.14
Maximum Capacity at A5W110: 47,770 BTU
COP at A5W110: 2.04
Maximum Capacity at A-4W95: 40,263 BTU
COP at A-4W95: 2.23
Maximum Capacity at A-22W95: 33,438 BTU
COP at A-22W95: 1.94
Cooling Water Temperature Range [Minimum / Maximum]: 41 F/ 77F
Maximum Capacity at A95W45: 42,650 BTU
EER at A95W45: 10.1
Maximum Capacity at A95W65: 51,182 BTU
EER at A95W65: 14.19

• Automatic Air Vent: As air builds up in a hydronic system over time, that excess air pressures is automatically purged to maintain optimal performance.
• Flow Sensor: The flow sensor maintains water pressure by monitoring the water flow rate and automatically adjusting the inverter output for maximum
efficiency.
• Flow Temperature Controller: Control board with multiple inputs/outputs to control 3rd party components
• Magnetic Filter: The magnetic filter catches large debris, sediment, and iron particles before they can impact the plate heat exchanger, pump, or other
piping, supporting system longevity and easier maintenance.
• Touch Screen Controller: The Hydrobox comes with a touch screen controller on the front panel
• All-in-one Hydrobox: Designed with front-access serviceability, the All-in-one Hydrobox includes the pumps, expansion vessel, magnetic filter, booster
heater, and plate heat exchanger.
• 3-in-1: Hydronic heating,cooling, and domestic hot water
• Auto Changeover: The unit will automatically switch between heating and cooling modes to maintain the set point.
• Boiler Integration : Boiler Integration enables the system to automatically switch from electric heat pump to boiler operation for consistent comfort. The system can also be set to switch based on optimal energy efficiency or ambient temperature.
• High-flow Temperature Performance: Ecodan is capable of delivering hot water up to 158°F outlet water even in low ambient temperatures.
• Hyper Heating: 100% heating capacity down to 5° F with guaranteed heating down to -22° F.
• Quiet Operation (Ecodan): The outdoor unit features ultra quiet operation as low as 41 - 45 db(A) due to an anti-vibration design with insulation around the compressor. The unit also offers a three-stage low-noise mode.
• Refrigerant Split System: A split system with R32 refrigerant

SPL (Sound Pressure Level): 34
PWL (Sound Power Level): 48
Unit Dimensions (W x D x H): 20-55/64" x 14-11/64" x 31-1/2"
Unit Weight: 93 lbs
Unit Weight (Water full): 106 lbs
Hydrobox water circuit volume: 1.3 gal
Booster Heater Equipped: Yes
Water Flow Rate [Minimum / Maximum]: 1.90 / 6 GPM
Expansion Vessel Equipped: Yes
Flow Temp Heating Set Point Range [Minimum / Maximum]: 68F / 158F
Flow Temp Cooling Set Point Range [Minimum / Maximum]: 41 / 77
Guaranteed Ambient Temp DB [Minimum / Maximum]: 32/95

Recommended Fuse/Breaker Size, ODU + hydrobox (without
booster heater): 40 AMPS
Recommended Fuse/Breaker Size, booster heater (requires
separate circuit): 35 AMPS
Airflow Rate Cooling CFM: 1,907
Airflow Rate Heating CFM: 2,119
Sound Pressure Level at A7W55: 45 dB
Unit Dimensions (W x D x H): 41-11/32" x 18-29/32" x 40-15/16"
Unit Weight: 252 lbs
Gas Pipe Size: 5/8"
Liquid Pipe Size: 1/4"
Maximum Piping Length [Reversible System]: 164'
Maximum Piping Length [Heating Only System]: 164'
Maximum Height Difference ft: 100'
Maximum Height Difference, ODU above IDU: 100'
Maximum Height Difference, ODU below IDU: 100'