Viessmann Vitocal 100-AW AM2V
Heat pump water heaters (HPWHs) are an efficient, electrified alternative to natural gas and electric resistance water heating in commercial and multifamily buildings. By extracting heat from ambient air and transferring it to water through a refrigeration cycle, HPWHs can achieve coefficients of performance (COP) two to four times greater than traditional electric resistance heaters. This efficiency translates to lower operating costs, reduced energy use, and significant greenhouse gas (GHG) reductions.
Learn MoreIf you are experiencing issues with the comparison tool, please disable your adblocker.
Viessmann Vitocal 100-AW AM2V
Compact inverter driven platform optimized for smaller homes and low temperature distribution systems. Strong controls ecosystem, quiet operation, and reliable European design, prioritizing integration over extreme cold capacity.
Hub Highlights:
- Tested COP 3.7–4.1 (at 47°F / 105°F)
- 6.0 kW heating capacity
- R32
- -13 F (-25 C)
- 149 F (65 C)
Last Edited on: July 2024
| Model Number | 20028 |
| Product Type | Monoblock air-to-water heat pump |
| Application | Space heating and cooling, domestic hot water |
| Heating Capacity | 20,500 BTU/h |
| Heating Capacity (kW) | 6.0 kW |
| Cooling Capacity | 16,800–18,000 BTU/h |
| Cooling Capacity (kW) | 4.9–5.2 kW |
| Published Heating COP | Multiple EN COP points, peak approx 4.9 |
| Published Cooling EER | 16.81 EN |
| Seasonal COP (SCOP) | Not available |
| Minimum Operating Ambient Temperature | -13 F (-25 C) |
| Maximum Operating Ambient Temperature | 109 F (43 C) |
| Maximum Supply Water Temperature | 149 F (65 C) |
| Minimum Supply Water Temperature | Not available |
| Refrigerant | R32 |
| Refrigerant GWP | 675 |
| Electrical Supply | 208–230 V single phase |
| Compressor Type | Variable speed inverter |
| Capacity Modulation | Wide inverter modulation |
| Integrated Circulation Pump | Yes |
| Control System | Viessmann proprietary controls |
| Sound Level | 55 dBA at 1 m |
| Certifications | Not available |
| Dimensions (Outdoor Unit) | 50.6 x 15.7 x 36.5 inches |
| Weight (Outdoor Unit) | 275 lb |
| Country of Manufacture | Germany |
| Intended Distribution Systems | Radiant floors and fan coils |
| Climate Suitability Category | Cold Climate Capable |
|
Reference Outdoor Temperature (°C)
|
8.3 |
|
Reference Entering Water Temperature (°C)
|
40.5 |
|
COP – Speed 1
|
4.05 |
|
COP – Speed 2
|
3.95 |
|
COP – Speed 3
|
3.85 |
|
COP – Speed 4
|
3.8 |
|
COP – Speed 5
|
3.74 |
Data Collection
Observations relevant to installation, operation, and maintenance based on laboratory evaluation and product documentation review.
Installation
System Configuration
Monoblock
Installation
Refrigerant Line Installation Required
No
Installation
Integrated Circulation Pump
Yes
Installation
Unit Weight
275 lb (lightest tested)
Installation
Refrigerant Flammability Class
A2L (R32)
Installation
Electrical Supply
208–230 V 1-phase
Controls & Communication
Communication Interface Used in Testing
Modbus RTU over IP — required additional configuration; less straightforward than standard Modbus
Controls & Communication
Control Interface Type
Viessmann proprietary controller; ViCare app available
Controls & Communication
Remote Monitoring / App
ViCare app — remote monitoring and basic control
Controls & Communication
BMS Integration
Modbus RTU over IP
Operation
Sound Level
55 dBA
Operation
Min Operating Ambient Temperature
-25°C (-13°F)
Operation
Max Supply Water Temperature
65°C (149°F)
Operation
Compressor Modulation
Variable speed
Operation
Suitable Distribution Systems
Radiant floors, fan coils
Maintenance & Support
Country of Manufacture
Germany
Maintenance & Support
Diagnostic / Fault Reporting
Fault history logging; accessible via controller and app
Maintenance & Support
Refrigerant GWP
675
Maintenance & Support
Lab Testing Observations
Unit operated as expected; Modbus RTU over IP communication required extra setup effort compared to other units