Heating technology

Heating Pump
BWP green

Product benefits:

Eligible for subsidies of up to 70%
Highest quality – Made in Bavaria
Barely audible thanks to whisper-quiet operation
Can be combined with photovoltaics & the BRUNNER Energy Manager – can also be expanded modularly at a later date
All-in-one unit: heating, cooling & hot water
Minimalist, modern design with a robust aluminium housing
Environmentally friendly propane refrigerant with a GWP of 1
Very high-quality components for efficiency & durability

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Green

Technical data
& Downloads

Product	Output range	Object size	Cladding (H×W×D)	Weight	COP (average SCOP 35°C)	Sound power level (DIN EN 12102-1)	Flow temperature	Energy Label
BWP 9 green	3 - 9.9kW	1 m²	1068 x 1430 x 700 mm	210 kg	4.89	45.2 dB	69°C
BWP 13 green	3 - 13,5 kW	1 m²	1369 x 1430 x 707 mm	230 kg	5.17	43.4 dB	69°C

Components of the heat pump

1. Condenser
A high-quality copper heat exchanger extracts heat from the refrigerant and transfers it to the heating system.
2. Compressor
The refrigerant is compressed by a particularly quiet, maintenance-free scroll compressor.
3. Evaporator
The evaporator transfers ambient heat to the refrigerant. Its generously dimensioned design ensures particularly high efficiency.
4. EEV valves
For precise expansion of the refrigerant from high to low pressure.
5. Safety valve
In the event of excess pressure, the safety valve automatically releases water pressure.
6. Electrical connection box
The following connections are required:
- 1x 400 V
- 1x 230 V
- 1x 4-pole bus connection cable
7. Receiver
Stores refrigerant that is not required in the high-pressure section under varying operating conditions.
8. Flow & return connection
This is generally routed downwards via a 5/4″ district heating pipe. Alternatively, the connection can also be routed to the rear.
9. Liquid separator
Collects saturated vapour from the low-pressure section under varying operating conditions.
10. 4-way valve
The valve reverses the heat pump circuit and is therefore used for cooling and defrosting. The evaporator becomes the condenser and vice versa.
11. Fan
Whisper-quiet and highly efficient, the fan draws air through the evaporator and releases it back into the surroundings.
12. Inverter technology
A frequency converter enables modulating compressor operation. The advantages of a heat pump with inverter technology include quieter and more efficient operation as well as longer running times with low power consumption.
13. Compressor technology
Uses the environmentally friendly and future-proof R290 refrigerant for highly efficient operation and higher flow temperatures in everyday use.
14. Condensate heater
Ensures that any condensate produced cannot freeze.

Made in Bavaria Quality & high-grade components

Large evaporator surface

The large evaporator surface features wide fin spacing. This allows the heat pump to absorb more ambient energy from the air, resulting in greater efficiency, improved performance and quieter operation. It also eliminates the need for cleaning – even during periods of high pollen levels.

Innenansicht Wärmepumpe mit Scrollverdichter

With scroll compressor

Compared with the rotary compressors used in conventional heat pumps, the scroll compressor operates more efficiently, quietly and reliably over the long term – quality that pays off.

Innenansicht Wärmepumpe mit großem Lüfterrad

Large fan wheel

The large fan wheel enables a high fresh-air flow rate at low rotational speeds. Less speed is required to move the air, which contributes to quiet and efficient operation. The high airflow also ensures stable performance.

Inverter-controlled

Thanks to inverter control, the output of the BRUNNER heat pump can be adapted precisely to current demand. This is particularly useful in combination with a PV system: the power consumption of the BWP can be optimally adjusted to the available surplus PV electricity.

Heating & cooling
All with one heat pump

The BRUNNER heat pump not only provides heating, but can also be used in summer to cool your underfloor or surface heating system. To do this, the heating process is simply reversed: instead of heating the heating water, the heat pump lowers the flow temperature and transfers excess heat from inside the building to the outdoors. This provides gentle cooling via the floor and wall surfaces and creates a pleasant indoor climate without draughts.

The key component of this system is a separate buffer storage tank. It hydraulically decouples the heat pump, reduces cycling and thereby helps to increase the service life and efficiency of the compressor. This allows the heat pump to operate for longer and more consistently within its optimum range while reducing electricity costs.

Existing surface heating systems in the building can also be used as silent cooling surfaces. And all of this works with the BRUNNER heat pump alone – without the need for additional equipment such as fans, air-conditioning units, extra pipework or condensate drains. One well-designed overall system and one central heat pump – for maximum comfort and energy efficiency.

Control Unit BCU in front of dark background

The boiler room solution
Heat pump & Heating Centre / Control Unit

With our boiler room solutions, you get more than just technology – you get a functional guarantee you can rely on. Combined with the BRUNNER Heating Centre or the BRUNNER Control Unit, your heat pump becomes the heart of a flexible, future-proof heating system that adapts to your needs.

Whether you want to provide hot water via a fresh water station, integrate additional heating circuits or make smart use of the electricity generated by your photovoltaic system – everything is possible, both in existing and new buildings, and the system can also be expanded modularly at a later date. And best of all: integration with BRUNNER boiler systems is simple and seamless.

With just one glance at the elegant glass touch display, which can be installed in the living area, you have everything under control: buffer temperatures, the operating status of the heat pump and much more – clearly arranged and intuitive to use. The central control system makes your entire heating system easy to operate without requiring specialist technical knowledge. This turns heating into an experience: noticeably comfortable, intelligently controlled and beautifully simple.

The classic wood-burning stove
and the heat pump in perfect combination

For technical reasons, the efficiency of air-source heat pumps decreases at particularly low outdoor temperatures. This is where a wood-burning stove comes into play: on those cold days when a wood fire is particularly enjoyable, a water-bearing wood-burning stove or fireplace can support and relieve the heat pump. This offers a number of advantages.

The BRUNNER Energy Manager also provides a simple and clear overview of the electrical energy flows in your home. Its modern user interface shows at a glance how electricity and heat are efficiently distributed for heating, hot water or even charging your electric car.

Go to heat pump & wood-burning stove heating

Pellet boiler with myBRUNNER app remote control

Mobile control of your heating system
With myBRUNNER

The myBRUNNER online access allows you to conveniently control your heating system via the internet. A dedicated app is also available for smartphones and tablets, providing easy and convenient operation. The familiar touch display user interface is used for control, allowing all functions to be accessed remotely – whether you are at home or on the go.

Setting up online access takes just a few minutes and is particularly useful for checking system status messages. You can also choose to receive important information and updates on the current status of your heating system by email.

App Download from Google Play App Download from Apple Store

The different heating solutions

Skizzenzeichnung für die Heizlösung Wärmepumpe PUR

PUR
Modern heating couldn't be more compact or affordable

Components: BRUNNER BWP green heat pump, buffer storage tank, hot water storage tank, electric heating element including connection kit and a BRUNNER Control Unit BCU including glass touch display.
- BRUNNER BWP green heat pump – compact monobloc unit that adapts to individual requirements.
- Control Unit BCU including glass touch display – the central control unit for the entire heating system. It can be positioned flexibly, for example in the entrance area.
- Space-saving dual storage tank with 300 litres of hot water and 100 litres of heating water; alternatively, an existing hot water storage tank can be used.
- Electric heating element (6 kW) including connection kit to support the heat pump on particularly cold days and when heat demand is high.

Can also be retrofitted to an existing heating system.
Cost-effective heating system.

Skizzenzeichnung für die Heizlösung Wärmepumpe PLUS

PLUS
A well-designed heating concept with everything you need

Components: BRUNNER BWP green heat pump, buffer storage tank, hygienic/stratified storage tank, electric heating element including connection kit and a BRUNNER Control Unit BCU including glass touch display.
- BRUNNER BWP green heat pump – compact monobloc unit that adapts to individual requirements.
- Central BCU system control with freely positionable touch display, for example in the entrance area. It optimises the interaction between the heating system, electric heating element (grid/PV electricity) and the BWP green heat pump. The heating and stove control systems are linked.
- Hygienic/stratified storage tank.
- Hydraulic connection kit with integrated electric heating element for direct, continuously variable charging using PV electricity via the integrated electric heating element (100–9,000 watts). Charging is possible up to the middle of the storage tank.

Can be combined with a water-bearing wood-burning appliance and/or a fossil-fuel heating system with stove control (optional).
Option of integrating photovoltaics and/or solar thermal energy: reduces electricity costs through increased self-consumption and reduced grid consumption.
Flexible heating solution that can be expanded modularly.

Skizzenzeichnung für die Heizlösung Wärmepumpe Premium

PREMIUM
A sophisticated heating system for complex heating solutions – with guaranteed functionality

Components: BRUNNER BWP green heat pump, buffer storage tank, system storage tank, electric heating element including connection kit, fresh water station and a BRUNNER Heating Centre BHZ with hydraulic box including glass touch display.
- BRUNNER BWP green heat pump – compact monobloc unit that adapts to individual requirements.
- Control system with Heating Centre BHZ as a turnkey system individually configured for the customer and designed for short installation times. It determines which heat generator is required based on an ecological hierarchy.
- Stratified charging storage tank for maximum energy utilisation with minimal energy input, optimum stratification and immediate hot water availability – specifically designed for heat pump and PV applications.
- Hydraulic connection kit with integrated electric heating element for direct, continuously variable charging using PV electricity via the integrated electric heating element.

Ideal for buildings with high heat demand.
Flexible and modularly expandable.
Up to six heating circuits for radiators, wall and underfloor heating as well as a swimming pool.
A neat, uncluttered boiler room with clean, minimalist premium components.

Brochure

Further information about this product can be found in the leaflet.

View all brochures

FAQ Heating Pumps

Why is the combination of a heat pump and a stove heating system so effective?
Even in Central European climates, it’s possible to heat your home all year round using renewable energy sources in a climate-friendly way — without skyrocketing electricity consumption or costs. The ideal solution is a combination of a heat pump and a stove heating system. In summer and during transitional seasons, the heat pump provides the necessary heat supply; when it gets colder, the fireplace takes over. This protects the heating system, saves money and benefits the environment.

To ensure that a heat pump does not become a power guzzler at low outdoor temperatures and can operate efficiently, it can be combined with a wood-burning appliance—such as a BRUNNER stove, fireplace or pellet heating system. Water-bearing models with a heat exchanger are particularly effective. They heat the room they are installed in and feed the excess energy into the heating system, where it can then be used for space heating or domestic hot water. The wood fire relieves the heat pump, reduces its coefficient of performance (COP) and prevents excessive wear. Combining a heat pump with a stove heating system can extend the pump’s service life by five to ten years.

The combination of a heat pump and a wood-burning appliance makes it possible to heat with renewable energy all year long. During transitional periods, just one or two burns per day are enough to supply the heating system and hot water—without the heat pump needing to run. In emergency situations, the entire heat demand could even be covered by a water-bearing fireplace or tiled stove.

In addition, a wood fire brings a unique, sensory experience to any home: warmth, crackling sounds, the scent of the wood and a pleasant glow. Custom stove systems with water-bearing wood-burning appliances are designed and built by professional stove builders, while a heating contractor integrates them hydraulically into the system. At BRUNNER, water-bearing fireplaces and wood-burning stoves are available as complete modular systems—making it the simplest and most cost-effective way to install a water-bearing wood-burning appliance in your home. Every system kit includes an original BRUNNER heating insert.
Wie viel kostet eine Wärmepumpenheizung?
Bei der Anschaffung einer Luft-Wasser-Wärmepumpe muss man mit entsprechenden Kosten rechnen, die vom Staat gefördert werden. Auch die Installation dieser Art der Wärmepumpe ist im Vergleich mit anderen Ausführungen – etwa einer Erdwärmepumpe bei denen eine teure Erschließung beziehungsweise Bohrungen hinzukommen – günstig. Betriebs- und Heizkosten einer Luft-Wasser-Wärmepumpe hängen von der erreichten Jahresarbeitszahl ab. Diese Kennziffer gibt die Effizienz einer Wärmepumpe an. Für eine Förderung wird eine entsprechende Jahresarbeitszahl gefordert, die ggf. auch im Altbau erreicht werden kann. Die Betriebskosten hängen vom Heiz- und Warmwasserbedarf ab und ganz erheblich vom Stromverbrauch.

Dieser lässt sich wiederum durch die Kombination Wärmepumpe-Holzfeuerstätte deutlich senken. Eine Wärmepumpe mit einer Heizleistung von neun Kilowatt, einer Jahresarbeitszahl von 3,0 und circa 1.800 Heizstunden hat im Jahr einen Verbrauch von rund 5.400 Kilowattstunde. Die Leistungszahl (COP) einer Wärmepumpe gibt das Verhältnis der Menge der erzeugten Nutzwärme und der dafür eingesetzten Antriebsenergie wieder. Seit Januar 2021 fördern das BAFA und die KFW die Installation von effizienten Wärmepumpen. Bis Juli 2021 betreffen die Förderungen nur die Modernisierung (35 beziehungsweise 45 Prozent beim Ölkesselaustausch / maximal förderfähige Kosten 60.000 Euro pro Wohneinheit). Im Neubau werden Wärmepumpen im Rahmen der Effizienzhäuser unterstützt. Erkundigen Sie sich bei der Bafa (BEG) über aktuelle Fördermöglichkeiten.
How much does a heat pump heating system cost?
The answer is: yes, you can. With our BWP “green”, the room temperature can be lowered accordingly in summer. The heating circuit is essentially reversed – this is known as “active cooling.” Wall and ceiling heating systems are best suited for this; with underfloor heating, only mild temperature reduction is possible. However, it’s important to keep in mind that the investment costs for this active cooling function are significantly higher.
Heat pump heating system: how loud is it?
A heat pump is installed outdoors, typically close to the building. During operation, it generates some noise — and the goal is: the quieter, the better. The key lies in the precise coordination of the components. Generally, the noise level of a heat pump ranges between 30 and 60 dB, with an average of around 50 dB.

At premium manufacturer **BRUNNER**, an extra-large compressor, intelligent vibration decoupling, and a low-noise, speed-controlled EC fan help minimize sound levels. The sound pressure level, when free-standing, is just **29.4 dB at a distance of two meters**.
How high is the power consumption of a heat pump heating system?
Every heat pump needs electricity to power its drive and pump. Air-to-water heat pumps work most efficiently when outdoor temperatures are between 2 and 15 degrees Celsius, depending on the model. When it gets colder, their efficiency drops noticeably – exactly when you need warmth the most. To keep the house warm in such conditions, an electric heating rod switches on. It provides the missing heat for the water and heating system, but it also uses a lot of electricity – and electricity is expensive. The greater the temperature difference between the heat source, in this case the outside air, and the heating system, the more energy, meaning electricity, is needed. A heat pump system can only work efficiently if the flow temperature, the temperature of the water circulating through the heating pipes, stays below 50 degrees Celsius. Ideally, it should be under 45 degrees. This is only possible in well-insulated new buildings or low-energy houses. Even then, electricity still accounts for around 20 to 30 percent of the total energy used.
How does an air-to-water heat pump work?
Its operating principle is simple and similar to that of a refrigerator – just the other way around. The outside air is cooled, while the inside of the house is warmed. The heat pump’s function can be explained in four steps:
- Absorb: The system takes in heat from the environment – from air, groundwater or the earth. This heat causes the refrigerant inside the heat pump to slowly evaporate.
- Compress: The refrigerant is then compressed using electrical energy, which makes it heat up further.
- Transfer: In the condenser, the refrigerant releases this heat energy to the heating system.
- Expand: Finally, an expansion valve cools the refrigerant down again so the process can start over.
A heat pump heating system consists of three main parts: the heat source system, which extracts energy from the environment; the heat pump itself, which converts this energy into usable heat; and a distribution and storage system that delivers the warmth throughout the home. Depending on whether the energy comes from air, ground or water, the technology used varies.
What is a heat pump heating system?
An air-to-water heat pump uses heat energy from the environment – depending on the type, from the air, the ground or from water. It transfers thermal energy from one medium to another.
Why choose a heat pump heating system?
If you heat your home with a heat pump, you don’t need a gas tank or connection, an oil tank, a storage room for pellets, or even a chimney. A heat pump produces no CO₂ and no emissions. It uses natural energy sources such as air, groundwater or geothermal heat – and these will never run out.

Heat pump systems need little maintenance, just regular check-ups. Another advantage is that many of them can even be used for cooling during the hot summer months.

One more reason why heat pumps are so popular is their high efficiency. On average, one kilowatt of electricity is enough to generate about three to five times as much heat energy.

A heat pump system also meets energy-saving regulations, and installation is simple.

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