PHW Highwall
The Polar Air PHW Highwall wall-mounted, hydronic fan coil provides high heating and cooling in a compact, discreet unit.
It features pre-installed, integrated valves to reduce installation time, enhanced latent cooling for improved dehumidification, and quiet operation.
Easy installation with low maintenance makes the PHW perfect for residential, business, hospitality, and educational applications, such as homes, hotels, data server rooms, and offices.
6 sizes available · 2-pipe or 4-pipe models
Advantages
Heating & Cooling
The highest certified capacity on the market with a heat/cool capacity of up to 6.6kW.
Ideal for various applications, including residential and business spaces like homes and small data server rooms.
Valves
Unique design integrates valves directly within the unit for a discreet appearance once installed.
Factory pre-installed valves mean on-site installation is fast, reducing labor requirements and overall project costs.
Performance
Enhanced latent cooling delivers stronger dehumidification and consistent temperatures.
Paired with quiet operation, the result is air that feels fresher, drier, and more peaceful, with less mold growth.
Design
A clean design features a smooth front panel, making the unit feel like part of the space, rather than just equipment.
Its easy-to-read LED display provides clear temperature information at a glance, and can be switched off for sleep friendly moments.
Models
Includes both a standard 2-pipe model and a rare 4-pipe option, uncommon in highwalls.
The 4-pipe allows heating in one area and cooling in another simultaneously, ideal for buildings with varied thermal loads like north/south-facing zones or occupancy patterns.
Installation & Maintenance
Front panel with access to control valves without dismantle, makes filter cleaning and troubleshooting easy.
Supplied ready to install, cutting time and cost, with internal drain pan, NBR insulation, flexible hoses, and G2 (MERV4) filter. With I-Type Control the Infrared Handset is also included.
Capacities
Metric
🍃 Airflow: 200 – 1250 m3/h
❄️ Cooling: 1.1 – 6.6 kW
☀️ Heating: 1.2 – 6.6 kW
🔊 Sound pressure: from 25 dBA*
Imperial
🍃 Airflow: 117 – 735 CFM
❄️ Cooling: 3800 – 22199 BTU/Hr | 0.3 – 1.8 Ton
☀️ Heating: 5036 – 34509 BTU/Hr | 0.4 – 2.9 Ton
🔊 Sound pressure: from 25 dBA*
* Sound pressure level measured at 1 m distance in a reverberation test room with the minimum volume of 200 m3.
- Compatible with renewable energy systems – works with solar thermal collectors, heat pumps, and other low-temperature sources for higher energy savings.
- Durable coil design – copper tubes and headers mechanically expanded into corrugated aluminum fins, pressure-tested up to 35 bar with a 16-bar operating limit.
- 0–10 VDC EC motor – delivers up to 30% energy savings compared to AC motors, with smoother speed control, quieter operation, and lower running costs.
- Manual air vent + water purge valve – enables quick and efficient system bleeding for hassle-free maintenance.
- Internal drain pan – safely collects and channels condensate, protecting interiors from leaks, water damage, and moisture issues.
- 5 mm (0.2”) NBR insulation – minimizes energy loss and prevents condensation for long-lasting efficiency.
- G2 (MERV 4) filter – captures dust and larger particles to improve indoor air quality and protect the coil.
- Infrared handset – included with I-Type control for convenient, user-friendly operation.
- Flexible hoses – simplify installation and servicing while reducing stress on pipe connections.
- I-Type Controllers: Infrared Handset or Wired Wallpad
- Valves: HYDRO+ VALVE Kit with 2/3-way body valve, on-off/modulating actuator (24V or 110-240V), BSPT or NPT connectors, connection piping kit, 2x shut-off valves, strainer and manual balancing valve
- Condensate pump: integrated Sauermann/Standard
- Electric heater: up to 1.5 kW
- Integrated transformer: converts from 230V to 24V for valve and thermostat compatibility
- Disconnect switch: integrated in control box
- Customization: available upon request (minimum order quantities apply)
Polar Air Control Logic
Polar Air fan coil units provide exceptional control flexibility to meet various application needs. Choose between two types of PCBs.
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
I-Type Control
Exclusively developed by Polar Air for intelligent control that includes our ADBS technology for ΔT management and group control. Configuration for 2- and 4-pipe models.
Available through ModBus, or compatible with Polar Air Wired Wallpad or Infrared Handset.
24/7 programming
Auto & 3-Speed functions
Sleep function
Auto-Restart function
Dehumidification mode
Adjustable swing louver positioning
Condensate drain pump control
Error diagnostics on unit LED display or Wired Wallpad
Valve control
Dry contact for On/Off applications
Electric heater control
2 x 24V auxiliary contacts for ERVS or dampers
Building Management Systems (BMS) compatible via Modbus
Auto-Dynamic Balancing System with constant ΔT management
255 units group control via ModBus
32 units group control via Wired Wallpad
W-Type Control
Simple yet flexible functionality that is easy to use, allowing for limited LED diagnostics and RPM configuration. Available for 2- and 4-pipe models.
Compatible with external thermostats from a variety of manufacturers.
Choose your own external thermostats
Configure the motor RPMs to your choice
Contact alarm for condensate drain pump and motor
Limited error diagnostics on unit LED display or Wired Wallpad
Project applications & references
Explore recommended applications and recent projects where it’s been successfully installed.
Residential
Houses · Apartments/Condos · Assisted Living · Nursing/Care/Retirement Homes · Student Accommodation/Residence Halls
Educational
Academies · Schools · Universities · Colleges · Libraries · Campus Buildings
Hospitality
Hotel Bedrooms · Hotel Reception Areas · Banquet Halls · Restaurants · Cafes · Bistros
Business
Offices · Data Server Rooms · Banks · Call Centers · Showrooms
Pratt Institute
2022
United States
New York
Rutgers D-Wing University
2026
United States
New Jersey
Herbert Hoover Presidential Library
2025
United States
Iowa
UBC Brock Common
2020
Canada
Vancouver
White Square Tower
2016
Qatar
Australian War Memorial
2025
Australia
Griffith University Park Village
2025
Australia
New construction · EC motor · I-Type control · student accommodation
Queens & Collins
2024
Australia
Rolleston College
2025
New Zealand
New construction · EC motor · W-Type control · campus buildings/classrooms
Serena Del Mar (Meraki)
2024
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
Serena Del Mar (Altana)
2022
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
Microsoft HQ
2022
United States
Washington
Curtin University (FHS)
2024
Australia
Retrofit · EC motor · I-Type control · campus buildings/classrooms
Serena Del Mar (Castelo)
2024
Colombia
New construction · EC motor · district cooling · condo/apartment blocks
Mairehau High School
2021
New Zealand
Hayward Field
2020
United States
Oregon
Our PASELECT Software is specifically designed to help users choose the most suitable Polar Air fan coils for any project.
Downloads: IOMs, Revits & Guide Specs
Access product resources including installation and operation manuals (IOMs), Revit files, and guide specifications.
Revit Files: PHW_4-pipe
|Size: 516 KB - ENRevit Files: PHW_2-pipe
|Size: 2 MB - ENIOM: PHW Highwall_METRIC_EC Motor
|Size: 3 MB - ENIOM: PHW Mural_METRICO_EC Motor
|Size: 3 MB - ES
Revit Files: PHW_4-pipe
|Size: 516 KB - ENRevit Files: PHW_2-pipe
|Size: 2 MB - ENIOM: PHW Highwall_IMPERIAL_EC Motor
|Size: 6 MB - ENIOM: PHW Mural_IMPERIAL_EC Motor
|Size: 6 MB - ESOur trusted network of authorized representatives ensures you receive exceptional customer service and product availability worldwide.
FAQs: highwalls
What PHW highwall capacity is best for my space?
Determining the right capacity for your highwall fan coil unit is crucial for achieving optimal comfort and efficiency.
The best way to find the perfect fit for your space is by using Polar Air PASELECT software. This innovative tool helps users design their ideal HVAC system by calculating multiple configurations tailored to their specific needs.
I’m looking for a 4-pipe highwall unit. Does Polar Air offer one?
Yes. The PHW range includes a rare 4-pipe model, which is something few highwall units on the market offer.
With separate supply and return lines for both hot and chilled water, it allows simultaneous heating in one area and cooling in another. This makes it ideal for buildings with varied thermal loads, such as north- and south-facing zones, or spaces with different occupancy patterns, all while delivering the sleek design and performance expected from a highwall.
This capability is especially useful in temperate climates or during seasonal transitions, when both heating and cooling may be needed within the same day.
What side are the PHW highwall water connections and control box on?
What length are the PHW connection hoses?
To support flexible and hassle-free installation, the PHW highwall unit now comes with longer connection hoses as standard. These hoses easily reach across to the opposite side, accommodating various piping layouts.
Installation Flexibility Options:
- Left-Side Piping (facing supply air): You can bypass the hoses and connect directly to the coil and valve.
- Center Connections: The longer hoses are flexible enough to bend toward the center. Alternatively, pre-sized shorter hoses are available and reach the middle of the unit.
- Right-Side Piping (control box side): The default longer hoses provide the necessary reach without modification.
This design ensures more efficient serviceability while supporting a wider range of layout scenarios.
How easy is it to install the PHW highwall?
The PHW is offered as a complete package, including an internal drain pan, NBR insulation, and MERV4 filter. Plus, there are compatible accessories also available.
Installing a highwall fan coil unit can be relatively straightforward for a professional HVAC technician. The process typically involves mounting the unit securely on a high wall, connecting it to the building’s electrical system, and integrating it with the existing HVAC infrastructure.
Proper installation ensures optimal performance and efficiency.
Do PHW highwalls need maintenance?
Yes, highwall fan coil units require regular maintenance to ensure optimal performance and longevity. Routine maintenance tasks include cleaning or replacing air filters, checking and cleaning the coils, inspecting electrical connections, and ensuring proper airflow.
Regular maintenance helps prevent potential issues, improves energy efficiency, and ensures the unit operates effectively. It’s recommended to schedule professional maintenance at least once a year to keep your highwall fan coil unit in top condition and to address any minor problems before they become major issues.
What is a highwall fan coil?
A highwall fan coil is a type of HVAC (Heating, Ventilation, and Air Conditioning) unit designed to be mounted high on a wall.
These units are commonly used in residential and business buildings to provide efficient heating and cooling.
Highwall fan coils consist of a fan and a coil, which work together to circulate air and regulate temperature. The fan draws in air from the room, passes it over the coil (which can be heated or cooled), and then distributes the conditioned air back into the space. This setup allows for effective temperature control and improved air circulation, making highwall fan coils a popular choice for maintaining indoor comfort.
The PHW Highwall fan coil units use hydronic (water-based) technology within the unit. Learn more about why Polar Air believe in hydronic systems here.
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