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Heat recovery for screw compressors

The operation of screw compressors generates a large amount of heat that can be used cost-effectively. Up to 94% of the electrical energy used for generating compressed air can be recovered as heat through consequent implementation of a heat recovery concept. The heat recovery leads to considerable energy cost savings and is environment friendly.

One way of recovering heat is to use the heat radiated by the compressor for heating in the form of warm air via exhaust air ducts.

Heat recovery with an oil/water heat exchanger, on the other hand, to heats the process water or heating water up to a temperature of 65°C. The heat is recovered by means of an oil/water heat exchanger. For this purpose, RENNER offers two systems that can also be retrofitted into existing systems and networks:

The integrated plate heat exchanger is installed in the screw compressor and directly integrated into the oil circuit, thus no additional installation space is required. Due to the additionally available water connections, it can be quickly and easily integrated into the in-house water network.



This solution is available for the following compressors:

RS-PRO 2.0-11.0 – 18.5
RS-PRO 2.0-30.0 – 55.0
RS 18.5 – 1-30.0
RS 55.0 – 250


The external heat recovery stand-alone unit is installed in a separate housing. Thanks to its compact dimensions and pre-installed connections, it requires little space and can be integrated into the existing system quickly and easily. External energy is not required for operation.


The stand-alone unit is suitable for the following compressors:

RS-PRO 7.5 – 18.5
RS 18.5 – 1-30.0
RS-PRO 2.0-30.0 – 55.0
RS 55.0 – 132


Double-walled safety heat exchangers are also available for sensitive areas and on request for both systems. Other temperature ranges are available on request.


The potential annual savings can be calculated using the following formula:

Usable energy (kW) x hours (h) x fuel oil price (€)


Calorific value of the oil (kWh/l) x heating efficiency factor



Potential annual savings when using a heat exchanger in a RENNER RS-PRO 15.0:

13.18 kW x 1680 h x 0.8 €

______________________________ = 2,113.58 Euro

9.86 kWh/l x 0.85



  • Considerable cost savings due to the free-of-charge use of the heat energy generated
  • Short payback periods thanks to energy cost savings
  • Low space requirement due to compact design or integration in equipment
  • Easy installation thanks to ready-to-connect components
  • Protects the environment, as the energy generated is recycled and used rationally
Variant overview
Heat recovery intern
Heat recovery extern

The RENNER secret of success: Partnership, service-oriented, reliable and short lead times

Innovative strength and high quality standards, coupled with a consistent focus on customer needs and a good price/performance ratio – this is the key to RENNER's success. Once you have purchased a RENNER compressor, you can be rest assure that you will receive a compact, robust, reliable and energy-efficient product specially tailored to your needs. In addition, you can take advantage of a servicing network of well-trained partners worldwide. This not only applies to our area of expertise, screw compressors, but also to piston compressors and oil-free compressed air – made in Germany.

Energy efficiency: a matter of course for RENNER compressors

Whether frequency-controlled, with refrigeration dryer, mounted on a compressed air tank or as a complete compressed air station: energy efficiency is a matter of course at RENNER. All series work extremely cost-efficient.

RENNER has more than 6,000 customizable compressor models on offer. From the pressure level to the energy consumption  we adapt your compressor exactly to your needs.

We are the specialists for compressed air

Quality Made in Germany – that's RENNER! In 1994 Annette and Bernt Renner founded the company in Güglingen, Baden-Württemberg. What started out as a garage with three employees has since developed into an international company with over 160 employees.

RENNER compressors are manufactured with the most modern production processes in every size and finish. From small mobile piston compressors to large SCROLL and screw compressors for industrial installations – compressors from Güglingen are represented all worldwide. RENNER is since 2006 certified according to DIN EN ISO 9001.