The objective of the client was to replace the existing gas condensing boiler with an environmentally friendly and highly efficient air-to-water heat pump, which is eligible for funding according to the BAFA BEG EM (Federal Office of Economics and Export Control – Energy
Efficiency Grant Program). The focus of this project was on the ecologically sustainable implementation of the Individual Renovation Action Plan (ISFP).

After dismantling the old system, the heating concept was based on a single-phase hydrosplit heat pump eligible for
funding according to the BAFA list. The latest L-generation of Panasonic’s Aquarea product line uses water for heat and cold transport from the outdoor unit to the indoor unit, completely avoiding climate-damaging refrigerants in the pipes. Within the outdoor unit, the natural refrigerant R290 (propane) is used, with a minimal Global Warming Potential (GWP) of 3. Thanks to the addition of the optional PCB, the device features a Smart Grid Ready interface and is connected to the potential-free utility signal, qualifying the system for discounted heat pump electricity. With a 100-liter heating buffer tank and an 185-liter domestic hot water tank, continuous supply is ensured even during temporary utility shutdowns. The anthracite-colored outdoor unit was discreetly placed on a pedestal in the front yard, seamlessly blending into the landscape.

As part of a core renovation, the two gas condensing boilers, one in each residential unit of the building, were to be replaced by a central air-to-water heat pump system, and a kitchen-living area needed to be supplied with fresh water and sewage disposal. The goal was to enable
separate billing of heating costs between the two residential units in the building. The focus was particularly on energy efficiency and ensuring transparency in energy distribution to the two units within the two-family house. One of the residential units required to supply two heating circuits: one with underfloor heating and the other with traditional radiators.

The chosen heat generator was a three-phase 12 kW monoblock unit from Panasonic’s Aquarea product line, equipped with T-Cap functionality. It was combined with a 300-liter domestic hot water tank from Austria Email and a 100-liter heating buffer tank from OSO Hotwater. The
replacement of old radiators with an underfloor heating system (with only a 4 cm build-up height) was achieved using the Schlüter Becotec System. The underfloor heating and traditional radiators operate through separate circuits with appropriately matched flow temperatures. The installed heat meters from the Optiline series by Richter+Frenzel ensure precise tracking and billing of energy costs between the parties.

Additionally, both residential units now have the option of floor cooling for the summer, with operation secured risk-free through condensation guards in the heating circuit distributors. To ensure energy supply from the basement to the attic, relevant supply lines were horizontally installed within the walls. The fresh water and wastewater sewage for the kitchen-living area was implemented using Viega Raxofix and Geberit Silent Pro to ensure quiet fluid transport.

To ensure restful sleep for parents and child even on hot summer nights, the bedroom and children’s room should be energy-efficiently air-conditioned. The success factors of the desired solution were energy efficiency, room aesthetics, indoor air quality with a special focus on pollen filtration, and the ability to heat in winter as well.

The choice fell on Panasonic’s highly efficient Etherea multisplit solution, which efficiently and demand-dependent distributes the performance of the outdoor unit (CU-2Z35TBE) to two indoor units (CZ-Z20XKEW). The integrated Nanoe-X technology filters bacteria, viruses, and pollen from the ambient air using hydroxyl radicals, ensuring reliable indoor air quality. Of course, the solution can be controlled via the Panasonic Comfort Cloud app or alternatively via voice control over the internet. Efficiency values according to SEER (8.50 / A+++) and SCOP (4.6 / A++) clearly set the solution apart from the competition.