Heat pumps: use renewable energy from nature for heating and cooling – also in bigger output ranges

May 2, 2023

In order to turn the urgently needed energy transition into a reality and achieve the climate targets we have made a commitment to, it is crucial that we start moving away from fossil fuel and, instead, turn to renewable energy in commercial, industrial and municipal energy systems. At the same time, reliability and profitability are particularly important in these areas of application. Viessmann boasts long-standing and extensive experience in the use of  heat pumps  in large-scale national and international projects, and is now expanding its Integrated Solution Offering to feature innovative products.

The new products at a glance

• The new Vitocal 200-A Pro is a compact air/water heat pump with heat outputs ranging from 32 to 128 kW.
• With rated heat outputs of 32 and 40 kW and a maximum flow temperature of 70 °C, the new Vitocal 250-A Pro air/water heat pump will be available starting in the fourth quarter of 2023. Up to 4 systems can be cascaded for larger outputs of up to 160 kW.
• Vitocal 350-G Pro is an innovative brine/water heat pump for heating, cooling and DHW generation that can use the soil, groundwater or outside air as heat sources.
• The new Titan HT booster heat pump offered by Viessmann’s subsidiary PEWO is designed for centralized DHW generation in large residential complexes and commercial buildings.    

Vitocal 200-A Pro: air/water heat pump for smaller commercial applications

The new Vitocal 200-A Pro air/water heat pump is designed for large residential complexes, office buildings and commercial premises with heating loads of up to 128 kW. It is also suitable for modernization projects with flow temperatures of up to 65 °C. The system can also be used for efficient building cooling (active cooling) and for DHW generation.

High flow temperatures with optimum coefficients of performance at the same time

Available in three types, the system offers a flexible heating and cooling solution that can be adapted to make it the perfect fit for the relevant requirements. Rated outputs of 32, 64 and 128 kW, or cooling output of 34, 69 and 139 kW, allow the system to be adapted to make it the perfect match for the customer’s needs. The system can be cascaded if a greater output is required. Highly efficient scroll compressors with multi-stage output matching, electronic expansion valves and the tried-and-tested enhanced vapor injection ensure low consumption and the highest possible coefficients of performance.

Enhanced vapor injection, also known as EVI, involves a certain quantity of refrigerant being channeled off behind the condenser, evaporated in an additional heat exchanger and then injected directly into the compression process. This means that, even when outside temperatures are low, higher flow temperatures are achieved than with conventional heat pumps, with the best possible coefficients of performance (COP) at the same time.

System control with Vitocontrol 200-M

Vitocal 200-A Pro can be connected to the tried-and-tested  Vitocontrol 200-M  – a modular, powerful system control unit with a graphical user interface – using an optional ModBus. The system control unit can be adapted to suit the customer’s specific requirements and shows clear performance and consumption data for the heat pumps and the energy system as a whole on the display.

Benefits for trade partners

• Fast installation thanks to factory-installed switching, control and safety devices

• Connection to Vitocontrol 200-M system control unit (optional ModBus)
• Makes servicing easy – one cooling circuit design for 3 system types
• 24/7 online monitoring

Benefits for users

• Also suitable for modernization projects with a flow temperature of 65 °C

• Best possible coefficients of performance thanks to highly efficient scroll compressors
• Multi-stage output matching with electronic expansion valves
• Compact dimensions for space-saving outdoor installation
• Vibration isolation for low noise emission values
• Weather-proof housing due to multiple layers of coating
• Eligible for subsidies from the German Federal Office for Economic Affairs and Export Control (BAFA)

Technical specifications

• Heat output: 32, 64, 128 kW

• Cooling output: 34, 69, 139 kW
• Maximum flow temperature: 65 °C (up to -7 °C)
• Energy efficiency category: A+/A++

Delivery date

The new Vitocal 200-A Pro air/water heat pump is currently being launched on the market.

Vitocal 250-A Pro: the alternative to fossil energy systems

With its high efficiency and flow temperatures of up to 70 °C, the innovative Vitocal 250-A Pro air/water heat pump is the ideal alternative for  generating heat in larger residential and shop buildings, as well as on commercial premises. What is more, the new heat pump can also be used to cool buildings – another advantage, particularly for commercial and public buildings.

High flow temperatures and low operating costs

The Vitocal 250-A Pro monobloc unit is available with rated outputs of 32 and 40 kW (cooling outputs of 30 and 38 kW, respectively). Up to four systems can be cascaded for larger outputs (heat output of up to 160 kW in total). The scroll compressor with continuously variable output matching, an electronic expansion valve and the natural refrigerant R 290 ensure high flow temperatures even on cold days while at the same time ensuring high levels of efficiency and, as a result, also low operating costs.

Internal unit with a large number of convincing advantages

The internal Vitocal 250-A Pro unit offers numerous functions, for example, up to three mixed heating/cooling circuits and a seasonal buffer cylinder. Hot water can be produced using a storage charging system or a storage charging pump. Instead of a drinking water reservoir, the  Vitotrans 353  fresh water station can also be used to produce hot water conveniently in continuous flow mode. If need be, an external heat generator can be integrated to cover peak loads.

Easy to integrate into building management systems

The integration of the Vitocal 250-A Pro into the building management system (BMS) is another plus point: this enables the heat pump and the hydraulic system to be monitored and controlled from a central control room. A standard BACnet IP or ModBus TCP/IP connection can be used for external control and to query all key indicators. Alternatively, hardware contacts are available for external control.

Benefits for trade partners

• For large single-family homes, large residential complexes and commercial applications

• Suitable for modernization projects with a flow temperature of 70 °C
• Factory-pre-installed switching, control and safety devices
• Easy to install and service
• Dual-mode operation with the available heat generator
• Cascading allows output requirements of up to 160 kW to be covered with only one internal unit (4 x 40 kW)
• Connection to building management system using integrated BACnet IP or ModBus TCP/IP interface
• Output matching through electronic expansion valves
• Ease of access makes the system easy to service
• Online system monitoring

Benefits for users

• Heating, cooling and DHW generation with one system

• Compact dimensions for space-saving outdoor installation
• Installation in densely populated areas thanks to low noise emissions
• Weather-proof housing due to multiple layers of coating
• Use of the natural refrigerant R 290
• Eligible for subsidies from the German Federal Office for Economic Affairs and Export Control (BAFA)

Technical specifications

• Heat output: 32, 40 kW

• Cooling output: 30, 38 kW
• (Maximum) flow temperature: 70 °C
• Sound power level: 69 dB(A)
• Dimensions (length [depth] x width x height): 1900 x 900 x 1550 mm
• Weight: 425 kg
• Energy efficiency category: A+++/A++ (at 35/50 °C)

Delivery date

The new heat pump will be launched on the market as of the fourth quarter of 2023.

Vitocal 350-G Pro: different heat sources for maximum flexibility

Vitocal 350-G Pro  is a compact, mono-mode brine/water heat pump for heating, cooling and DHW generation that can use the soil, groundwater or outside air as heat sources. With four output sizes (maximum heat output of 75, 100, 150 and 210 kW), it is the ideal solution for a large number of requirements in residential and commercial buildings, as well as in commercial and industrial operations. Flow temperatures of up to 75 °C also facilitate use in modernization projects and for mono-mode DHW generation.

State-of-the-art compressor frequency control for precise output matching

Highly efficient reciprocating compressors with frequency-controlled output matching in conjunction with an electronic expansion valve generate the building heating or cooling load required. Frequency control also ensures a balanced serviced life of the compressors and, as a result, greater durability.

Digital PLC control of up to four heating/cooling circuits

The digital PLC heat pump control system offers high functionality. Options include system functions such as “active“ or “natural cooling“ for building cooling and up to four heating/cooling circuits. This means that the heat pump can be adjusted to suit specific customer wishes, right down to controlling the entire system hydraulics.

Multi-mode system control and increased output

The Vitocal 350-G Pro can control an additional heat generator – for example, a gas boiler – to cover peak loads. A cost-efficient master/slave combination is another option that can be used to increase output. This involves the master heat pump controlling the second heat pump, which does not require its own PLC control system as a result.

In existing energy systems, the Vitocal 350-G Pro can be controlled externally by the higher-level  Vitocontrol 200-M  control unit. Other options include integration into a building management system (BMS) using floating contacts or optional control via ModBus/BACnet.

Benefits for trade partners

• Factory-pre-installed switching, control and safety devices
• Easy to install and service
• Connection to Vitocontrol 200-M or BMS
• PLC heat pump control system with extensive system functions
• Easy to service: 1 cooling circuit for 4 system types and additional shut-off valve
• Victaulic coupling connection with flange adapter for maximum flexibility
• Pre-assembled frequency converter in compact housing for floor or wall mounting
• Separately supplied housing panels allow for a smaller heat pump installation width
• System monitoring and remote access to the heat pump controller online at any time
• Integrated diagnostic system for fast fault rectification and troubleshooting

Benefits for users

• Ideal for modernization with a flow temperature of 75 °C
• Mono-mode heating, cooling and DHW generation possible
• High coefficients of performance thanks to highly efficient frequency-controlled reciprocating compressors
• Compact dimensions for space-saving installation
• Cooling circuit not attached to the base frame for minimum vibration transmission
• Soundproofed housing
• Extensive system functions in one control system

Technical specifications

• Maximum heat output: 75, 100, 150, 210 kW

• Maximum cooling output: 58, 75, 113, 157 kW
• Maximum flow temperature: 75 °C (up to -1 °C)
• Sound power level: 67.5 dB(A) (type BWR/BWS 352.C075)
• Energy efficiency category: A++ (type BWR/BWS 352.C075)

PEWO Titan HT: booster heat pump for centralized DHW generation

DHW generation also plays an increasingly important role in saving energy. This is why Viessmann’s subsidiary  PEWO  has designed the Titan HT booster heat pump for efficient centralized DHW generation in large residential complexes and commercial buildings.

The booster heat pump can use external heat sources

An external heat source, for example, a low-temperature (LT) buffer cylinder with a heat pump or an LT network, serves as the basis. Both operate at a low flow temperature of approx. 35 °C for panel heating. This is sufficient to increase the water temperature to up to 65 °C using a downstream booster heat pump.

The flow temperature can be increased to 75 °C for thermodynamic disinfection via a fresh water station.

Cascade to boost output

The compact Titan HT water/water heat pump operates in an output range from 12 to 29 kW. For both source and heating water, it requires only one globe valve and a common circulation pump. Several systems can be cascaded to boost output.

The HT buffer cylinder balances out consumption peaks

As hot water requirements fluctuate throughout the day, a(n) (optional) high-temperature (HT) buffer cylinder balances out consumption peaks. It can be fitted with an electric heating rod (9 kW). Up to 2 HT buffer cylinders can be used in the system.

Everything from a single source: system solution in an all-in-one package

The system solution for centralized DHW generation is designed for use in residential buildings comprising up to 100 units and in commercial buildings. In the factory-configured packages, the Titan HT heat pump, together with the  pewoAqua S  fresh water station, ensure demand-oriented DHW generation in continuous flow mode. The station is available with tap capacities from 10 to 101 l/min. The smooth operation of all system components is controlled centrally via the pewoAqua S.

Benefits for trade partners

• Addition of a renewable energy system as a durable and cost-cutting solution for central DHW generation in the building sector (for both new and existing buildings)

• Helps to effectively reduce CO2 when generating heat in large residential complexes or commercial buildings if electricity from renewable sources can be used
• Tried-and-tested booster heat pump technology with hot water expertise from Viessmann’s subsidiary PEWO

Benefits for users

• Consistently high hot water output at 60 °C and high levels of efficiency (COP of up to 5.8) compared with electrical reheating using an electric heating rod

• Saves energy costs by preventing high rated electrical output
• Independent of the number of sunshine hours compared to a photovoltaic system in combination with an electric heating rod

Technical specifications

• Output: 12 to 29 kW (can be cascaded to increase output)

• Maximum flow temperature: 75 °C (for disinfection)
• Tap capacity: 10 to 101 l/min (with pewoAqua S)

Delivery date

The Titan HT booster water pump is already available.