Energy from the air, ground or groundwater

Heat pumps use energy from underground, the groundwater or the air for DHW and central heating.

Benefits

  • Compliant with 2016 EnEV requirements
  • Up to 50 percent reduction in heating bills
  • Economical even at outside temperatures of -20 °C
  • No CO2 emissions ("zero emission heating" when using green electricity)
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How a heat pump works

The heat pump is a thermodynamic heating system. It can be used to convert environmental energy into heat for your home. The heat, which is drawn from water, the ground, outdoor air or extract air, first passes through an evaporator from whence it is fed, via a condenser, into the heating system. Approximately five parts environmental energy and one part electrical energy are provided as heating energy. Electrical energy is required to "pump" the environmental energy, which is at a low level of -20 °C to +35 °C (air), to a temperature level suitable for heating (DHW).

What are heat pumps and what are the benefits?

Heat pumps provide an alternative to traditional ways of heating and hot water generation.

Heat sources for heat pumps

There are many different kinds of heat pumps, but they all operate on the same basic principle of heat transfer. Heat transfer means that rather than burning fuel to create heat, a device moves environmental heat from one place to another. In a heat pump, this heat is transferred from a heat source (e.g. the ground, air or water) to a heat destination (e.g. your home).

Heat pumps extract the sun’s heat from air, water or the ground and, as they work primarily by moving heat, not creating it through burning fuels, they are highly efficient, and will significantly reduce your carbon emissions. Traditional systems require about one unit of electricity or gas to generate one unit of heat. Typically you only need one unit of electricity to deliver three or four units of heat with a heat pump. Heat pumps work effectively all year round.

Energy Label for heating heat pumps

The top of the ErP label displays the name of the manufacturer (I) and the model designation (II) of the product. The rating system for heating heat pumps categorises them into nine efficiency classes. A++ is the highest energy efficiency class. G denotes appliances with extremely poor values.

STIEBEL ELTRON products are almost exclusively in the top group. All STIEBEL ELTRON heating heat pumps are already in the top rating category, i.e. classes A to A++.

stiebel eltron energy rating

Ground Source Heat Pumps

Stiebel Eltron
wpf 13

Spec

  • 12.59 kW heating output at B0/W35
  • Integral heat pump control unit
  • Heating flow temperature up to 60 °C
  • Extremely quiet operation

Details

The WPF heat pump is a powerful energy provider for DHW and central heating. With its integral heating control unit, circulation pump, safety valve and integral heating cartridge, this unit is virtually ready for a basement installation. The heat pump also adapts very well to cramped conditions. Thanks to its compact design, the WPF is just as efficient in its use of space as it is in its use of energy. The striking design also draws attention to the special qualities of this powerful heat pump.

Technical Data

  • Product Number: 230947
  • Output at B0/W35 (EN 14511): 12,59 kW
  • Coefficient of performance at B0/W35 (EN 14511): 4,42

Stiebel Eltron
wpf 66

Spec

  • Two appliances may be stacked where space is at a premium
  • Suitable for cascade control for high output requirements
  • With integrated heat and electricity meters
  • High reliability through robust single compressor design
  • Extremely quiet operation

Details

The benefits of advanced heat pump technology are multiplying. The WPF series of heat pumps was developed specially to supply larger residential complexes as well as commercial and industrial buildings with heat. On request including DHW provision. Cascade control enables one or more units to provide the base cover for heat; peak loads are covered by starting additional units. This clearly reduces running costs. When several units are used, two heat pumps can be stacked to save space. This way, heat pump systems not only save energy but also space.

Technical Data

  • Product Number: 233008
  • Output at B0/W35 (EN 14511): 67,10 kW
  • Coefficient of performance at B0/W35 (EN 14511): 4,56

Air Source Heat Pumps

Stiebel Eltron
wpl 15

Spec

  • Air | water heat pump installed outdoors for heating
  • With energy efficient inverter technology for high flow temperatures even during cold winters
  • Suitable for buildings set closely together thanks to low operating noise
  • Can be combined with a solar thermal system
  • High energy efficiency class A++ even at a flow temperature of 55 °C

Details

The design of the WPL 15 AS inverter air | water heat pump offers many benefits for both new build and modernisation projects. As an outdoor installation, the appliance requires minimal space indoors and can be sited even in densely built-up areas, due to exceptionally quiet operation. Thanks to the high quality of the individual parts, this model reaches an output that enables high flow temperatures of up to + 65 °C. Quick installation is ensured by the hydraulic connection and straightforward connection concept. In short, this is an appliance designed to provide an outstanding level of convenience all round. Furthermore, the WPL 15 AS can be combined with a variety of DHW, system and buffer cylinders from STIEBEL ELTRON.

Technical Data

  • Product Number: 232491
  • Output at A2/W35 (EN 14511): 4,23 kW
  • Output at A-7/W35 (EN 14511): 6,86 kW
  • Coefficient of performance at A2/W35 (EN 14511): 3,88
  • Coefficient of performance at A-7/W35 (EN 14511): 2,83

Stiebel Eltron
wpl 25

Spec

  • Air | water heat pump installed outdoors for heating
  • High efficiency due to demand-dependent control of the inverter compressor
  • Increased efficiency through enhanced saturated vapour injection
  • High coefficient of performance
  • Extremely quiet operation
  • Condensate pan is defrosted efficiently via the refrigerant circuit
  • Time optimised and energy efficient defrosting by reversing the circuit
  • Control via WPM 2.1 or WPM 3 heat pump manager (required accessory)

Details

The inverter air-water heat pump design offers many benefits for both new build and modernisation projects. As an outdoor installation, the appliance requires minimal space indoors and can be sited even in densely built-up areas, due to exceptionally quiet operation. Thanks to the high quality of the individual parts, these models reach an output level that enables flow temperatures of up to + 65 °C to be achieved. Quick installation is ensured by the hydraulic connection and straightforward connection concept. In short, this is an appliance designed to provide an outstanding level of convenience all round. Furthermore, the heat pumps can be combined with a variety of DHW, system and buffer cylinders from STIEBEL ELTRON.

Technical Data

  • Product Number: 236642
  • Output at A2/W35 (EN 14511): 8,32 kW
  • Output at A-7/W35 (EN 14511): 13,05 kW
  • Coefficient of performance at A2/W35 (EN 14511): 3,96
  • Coefficient of performance at A-7/W35 (EN 14511): 2,98

More info on Stiebel Eltron products

The information above hopefully provides a clearer picture of what heat source pumps are and what they do. Green Giant Services can install, service and maintain all of these products for you and contact us if you would like more information on how we can help you get started with heat pumps or keep yours in top condition. For info on all Stiebel Eltron products then please visit their website for more information.