Free and Hanseatic City of Hamburg, Germany
The landlords of two multi-family buildings (MFBs) in the Schnelsen district in Hamburg were worried that their old heating system might reach its end of service life in the near future. Thus, it was their highest priority to ensure that the tenants could still properly heat their apartments in the upcoming winter days so no one had to be cold.
Accordingly, they went out looking a modern and sustainable solution that could be implemented without renovation efforts going pear-shaped. Eventually, they found a way:
Both buildings would be heated with a hybrid solution consisting of heat pumps and gas boilers.
Lessons learned
- Even without an extensive renovation of the buildings, the heat pumps were able to keep the inhabitants comfortable.
Key facts
| Building | Heat Pump and Source | ||
| Location | Hamburg, Germany | Number of HP | 2 (1 for each building) |
| Construction | 1968, retrofitted | Operation mode | bivalent-parallel |
| No. of buildings | 2 | Heat source | air |
| Level of insulation | poor | Type of system | central |
| Model | Vitocal 200-A PRO AWo-AC 201 | ||
| Installed power | 32 kW 64 kW | ||
| Heating system (SH + DHW) | |||
| Heating temp | 65°C | Gas boilers | 60 kW 160 kW |
| Other information | |||
| Climate Zone | Cfb | COP | 3.9/4.0 |
| CO2 Savings | 37,700 kg/year | Refrigerant | R407C |
Description of the technical concept
The hybrid system that was installed consists of two heating components for each building:
- An air-to-water heat pump (Viessmann Vitocal 200-A PRO AWO-AC 201), 32 kW for the smaller building and 64 kW for the larger one
- A gas boiler; 60 kW for the smaller building and 160 kW for the larger one.
In each building, the heat pumps provide the base heat. On days that are especially cold, the boilers are activated and deliver the peak load. The smaller heat pump has a COP of 3.9 while the larger one has a COP of 4.0.
No extensive renovations have been done on the building’s envelope or structure for the HP installation.
DE014 – Hybrid Solution fot two MFBs in Hamburg
Case study delivered by: Bundesverband Wärmepumpe bwp BWP-Datenbank | Bundesverband Wärmepumpe (BWP) e.V.