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Fan Coil Unit — Wall-Mounted
Fast, simple hydronic heating-and-cooling retrofit with no ceiling access or ductwork.
Shipping$149Free
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Installed in real homes and workshops
I purchased it about four or five years ago. It worked very reliably since then.
1.5-Ton Wall Fan Coil Customer Story
Customer experience with an installed Apollo 1.5 ton wall fan coil.
The APOLLO Wall-Mounted Fan Coil Unit is designed for efficient hydronic heating and cooling without ductwork. Its clean wall-mounted design delivers quiet room-by-room comfort, simple installation, and reliable performance for homes, offices, bedrooms, garages, workshops, and light commercial spaces.
Remote control and thermostat not included. Requires a compatible 24VAC FCU thermostat, purchased separately.
| Specification | 1.5 Ton | 3 Ton |
|---|---|---|
| Cooling | 12,000 BTU | 18,500 BTU |
| Heating | 18,400 BTU | 31,500 BTU |
| Coverage | 400–900 ft² | 800–1,300 ft² |
| Power usage | 33 W | 35 W |
| Airflow | 225–400 CFM | 250–600 CFM |
| Noise | 33–45 dB | 33–47 dB |
| Weight | 20 lb | 30 lb |
| Connections | ½ in NPT |
|---|---|
| Power supply | 120 VAC |
| Thermostat control | 24 VAC |
| Pressure rating | 200 PSI |
Complete the system
APOLLO Heat Pump
Fan coils need hot or chilled water to run. Our Apollo air-to-water heat pumps supply that water — heating in winter, cooling in summer.
View detailsAPOLLO Wi-Fi Thermostat
A dedicated fan coil thermostat runs the unit on a schedule and only when there is real demand, reducing energy use and improving room-by-room comfort.
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Multi-zone install
The Y-connector lets two fan coil units share a single heat pump circuit, expanding whole-home coverage without adding a second outdoor unit.
View detailsAnswers
The Apollo Wall Fan Coil comes in two sizes with estimated coverage guidance: 1.5-ton AP-FCU-18K: 400–900 ft²; 3-ton AP-FCU-36K: 800–1,300 ft². Actual sizing depends on insulation, layout, climate, water temperature, and heat loss. Multiple fan coil units can share one air-to-water heat pump through a common hydronic loop.
The 1.5-ton AP-FCU-18K delivers 12,000 BTU of cooling and 18,400 BTU of heating. The 3-ton AP-FCU-36K delivers 18,500 BTU of cooling and 31,500 BTU of heating. Actual output depends on entering water temperature from your heat pump.
Yes. It connects to a hot or chilled water loop through ½ in NPT threaded fittings. One heat pump can supply multiple fan coil units simultaneously for multiple zones without refrigerant lines to each room.
Any standard 24VAC fan coil unit thermostat is compatible. MBTEK's Wi-Fi Fan Coil Thermostat adds scheduling and remote control. The thermostat controls three fan speeds and switches heating or cooling modes based on water temperature.
The 1.5-ton model operates at 33–45 dB and the 3-ton model at 33–47 dB, depending on fan speed. At low speed, both are quieter than a typical library.
Yes. Selectable 2-pipe and 4-pipe variants are available. A 2-pipe system shares one hot-or-chilled loop; a 4-pipe system uses separate hot-water and chilled-water circuits for simultaneous heating and cooling designs.
The wall fan coil uses ½ in NPT threaded supply and return connections and is rated to 200 PSI. Shut-off valves and an air vent are recommended. Insulate supply piping to prevent surface condensation during cooling.
The 1.5-ton AP-FCU-18K draws 33 W and the 3-ton AP-FCU-36K draws 35 W on 120 VAC. Thermostat control wiring runs at 24 VAC.
Wall FCUs are visible, surface-mounted, and fastest to retrofit. Concealed FCUs hide above a ceiling and use short ducts; ceiling cassettes mount flush and discharge air four ways. Each wall unit includes a condensate drain pan and 7 ft of flexible drain tubing; thermostat, piping, valves, and air vent are separate.
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