AIR-TO-WATER HEAT PUMP SYSTEM
Daikin ALTHERMA 3 H HT
The Daikin ALTHERMA 3 H HT air-to-water heat pump system is designed to cover a wide range of hydronic applications, making it an excellent choice for replacing boilers and furnaces, especially in areas with low ambient temperatures.
Once the outdoor unit is connected to the indoor unit, there is a range of system combinations, such as being paired with emitters already in the home like baseboards or radiators, or be integrated with heat pump convectors, hydronic air handlers, and in-floor radiant loops.
The versatility extends to applications like new buildings, retrofits, and low-energy houses. This versatile space-saving system contributes to modern aesthetics complementing form and function.
DAIKIN ALTHERMA 3 H HT
The Air-to-Water Difference
Engineered for Comfort
Elevated Heating and Cooling Capacities
Heating
Cooling
Stay cool and comfortable all summer long. The Daikin ALTHERMA 3 H HT efficiently provides cooling even if outdoor temperatures reach up to 109°F.
Hot Water
Enjoy reliable hot water year-round. The Daikin ALTHERMA 3 H HT provides domestic hot water for various locations and climate conditions.
PERFORMANCE FEATURES
Daikin ALTHERMA
 | Sustainability: This all-electric system is designed to help reduce a home’s carbon emissions, compared to fossil fuel burning systems. An added benefit if the electricity comes from renewable sources like solar and/or wind power. |
 | All-Climate Operation: Daikin ALTHERMA 3 H HT operates reliably in various climates. Space heating + domestic hot water (DHW) is possible down to -18°F (-28°C) ambient. ALTHERMA is designed to produce high leaving water temperatures (LWT) of up to 158°F (70°C) and provide space cooling up to 109°F (43°C) ambient. |
 | Energy Efficient: The Daikin ALTHERMA 3 H HT electric air-to-water heat pump provides an efficient, sustainable heating solution, supporting the transition away from fossil-fuel-based comfort systems toward all-electric energy. |
 | Signature Technology: Daikin ALTHERMA 3 H HT air-to-water heat pump systems are designed with the latest technology and manufactured to exacting standards. Modern inverter-driven compressors and fan motors plus micro-processor controls deliver constant comfort and high efficiency performance. |
SIGNATURE COMFORT
Daikin ALTHERMA
3-in-1 "Plumb-and-Play" solution: For heating, cooling, and domestic hot water (DHW).
Easy home integration: Boiler, gas furnace, and optional gas DHW replacement with the ability to keep heating installation and radiators.
Reliable in cold climates: Designed to operate in cold climate conditions down to -18°F (-28°C).
Proven and future-focused: Features R-32, a low GWP (Global Warming Potential), efficient, available, and proven A2L refrigerant. However, there is no refrigerant piping inside the home.
Innovative Design: Complimentary gray style enhances the unit’s appearance, but its fan design also helps diminish noise perceptions for a serene outdoor (and indoor) environment.
ELEVATE QUIET
Engineered for Tranquility
The Daikin ALTHERMA 3 H HT operates at 41 dBA, similar to the sounds inside a library. The unit offers additional flexibility with a low sound mode, which lowers the sound pressure down to a very quiet 35 dBA.
The outdoor unit incorporates a unique ‘invisible’ fan shape to minimize the air contact surface, helping to maintain a low sound level. Three layers of insulation surround the compressor to minimize operational sounds. To further enhance the quiet, the Daikin ALTHERMA 3 H HT features double sound reduction pads between the bottom plate and the vibration plate.
Indoor Units
Wall-mounted
indoor unit (hydrobox)
- All hydraulic components are included in the wall-mounted hydrobox for ease of installation and minimal field supplied components required.
- Integrated 6 kW electric backup heater operating in steps of 2, 4, and 6 kW.
- Easy access to PCB board and hydraulic components.
- Compact dimensions allow for small installation space, as almost no side clearances are required.
- Combine with the Daikin ALTHERMA stainless steel domestic hot water tank.
Stainless steel
domestic hot water tank
- Available in 40, 50, and 80-gallon sizes, providing application and installation flexibility.
- High-quality insulation keeps heat loss to a minimum.
- Integrated recirculation connection.
- Connection for an optional anode.
- Integrated 3 kW electric booster heater with App functionality.
- Meets NSF 61 and NSF 372 certification (drinking water standards).
Heat Pump Convectors
Daikin ALTHERMA 3 H HT heat pump convectors are indoor fan coils that can provide both heating and cooling to the space. These heat pump convectors can be combined with other emitter types like radiators, baseboards, and in-floor radiant loops, or can be used as a standalone emitter in a space.
Floor-standing
heat pump convector
- High heating/cooling capacity through forced convection
- Sound pressure level down to 31 dBA at about 3 ft
- Slim and discreet design
- Integrated thermostat and fully modulating controller for instant zoning
- Right and left‑hand side connections available
- 2-way and 3-way motorized valves available as accessories
- Compatible with the Daikin ALTHERMA 3 H HT heat pump system
High-wall
heat pump convector
- High heating/cooling capacity through forced convection
- Sound pressure 25 dBA at about 3 ft
- Slim and discreet design
- Integrated thermostat and fully modulating controller for instant zoning
- Right and left‑hand side connections available
- 2-way and 3-way motorized valves available as accessories
- Compatible with the Daikin ALTHERMA 3 H HT heat pump system
Thermostats
Daikin D2271 Connected Thermostat
Features:
- Designed to work with the Daikin ALTHERMA air-to-water heat pump system
- Compatible with the SkyportHome app to access your system remotely from anywhere with an internet connection
GET STARTED
Contact Daikin
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PERFECTING THE AIR WE SHARE
Why Daikin?
Air is all around us. It is a precious resource that may tend to be overlooked. At Daikin, we place a strong emphasis on pioneering innovative indoor comfort technologies to elevate indoor air quality, helping to enhance personal well-being and reinforcing our commitment to sustainability and Perfecting The Air We Share.
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Comfort meets innovation.
Daikin’s relentless pursuit of innovation and cutting-edge technology sets a new standard for sustainable, energy-efficient indoor comfort solutions.