Heat pump

  • Inverter air source heat pumps

    The inverter matches the output precisely to the actual heat demand.

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    Energy from the air, ground or groundwater

    Heat pumps use energy from air, underground or groundwater for domestic hot water, cooling and central heating.


    • Compliant with the new South African Government requirements for heating
    • 50 to 80 percent reduction in heating costs depending on model of heat pump
    • Economical even at outside temperatures of -20°C
    • No CO2 emissions ("zero emission heating" when using green electricity)

    In our academy in Holzminden, we teach about innovative building technology: the way heat pumps work is our theme for today – simple and easy to understand! Click now.

    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 air extracted from the house, 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 is 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 domestic hot water. 

    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 heating 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++.

    You ask, we answer: heat pumps use electricity – are they good for the environment? Watch the video and leave no questions open.

    The right heat pump

    The WPL 15 ACS

    Positioned and installed outdoors, the WPL 15 ACS air|water heat pump can be used for heating in winter and cooling in summer. The WPL 15 ACS is the right option, even in very densely built-up areas, as its low operating noise will not disturb the neighbours. The WPL 15 ACS is designed for outdoor use. The appliance carries an A++ EU Energy Label and offers cosy warmth from the air, while others turn on their central heating.

    The air|water heat pump can also be used at temperatures well below freezing point – and is always exceptionally efficient. These heat pumps can also be used in modernisation projects due to their high flow temperatures that are achieved even at low outside temperatures.

    The WPL 15 ACS – warms in winter, cools in summer

    In our academy in Holzminden, we teach about innovative building technology: the way heat pumps work is our theme for today – simple and easy to understand! Click now.

    Steps to the right heat pump

    1. Building inspection
    2. Calculate the heat load
    3. Select the heat pump functions
    4. Identify the type of heat pump
    5. Find an installation location
    6. Obtain your personal quotation
    7. Service and promise of guarantee

    Are you interested in modernising an older building? In our "Planning" area we have information on how you can save. We show you sample applications from "affordable" and "convenient" through to "efficient". Find out all about modernising with heat pumps. Understand the process involved in selecting and designing the right heat pump by reading our "Expert tips from a qualified contractor".

    You will find answers to other questions that regularly pop up in our Heat pump FAQ.

    Domestic hot water heating with heat pumps

    You need an affordable solution for your domestic hot water: for domestic hot water heating from renewable sources, the domestic hot water heat pump offers a quick and convenient solution. Domestic hot water heat pumps are affordable to buy and easy to install. They are outstandingly efficient, as the heat is recovered from the ambient air at the installation site.

    * Certain parameters are assumed when issuing quotations. Your qualified contractor will have to confirm and evaluate these in person during an on-site visit. If an alternative solution needs to be found due to the installation location or other factors, the quotation may need to be amended.