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Stiebel Eltron WPF 20/27/35/40/52/66

Stiebel Eltron WPF 20/27/35/40/52/66

  • Geothermal hydronic heating for larger complexes
  • 21.5 – 67.1 kW heating output at B0/W35
  • Stackable design to maximise available space
  • Cascade control for high output requirements
  • Extremely quiet operation
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Designed for residential and commercial complexes with larger heating loads, the stackable WPF range of geothermal hydronic heat pumps are a demonstration of the advancement of heat pump technology. Featuring cascade control which allows additional units to be started dependant on peak loads. Winner of multiple design awards, the WPF 20-66 geothermal heat pumps can be stacked to save space.

APPLICATION: Geothermal, or water to water, heat pump with high degree of integration for indoor installation. Thanks to the high flow temperatures, can be used in mono mode to provide heating and hot water in new buildings and renovation projects. Can also be used for buildings with apartments, depending on the building’s heat load.

EQUIPMENT / CONVENIENCE: The refrigerant circuit is mounted on an anti-vibration base plate to reduce noise transmission into the building. The constant source temperature ensures unchanging year-round heating efficiency, with flow temperatures up to 60 ° C. The integrated heat pump controller enables fully automatic, weather-compensated control of the heating system and the ability to monitor the system via a home network or mobile terminal device when coupled with the optional ISG. With integrated heat and energy metering via data from the refrigerant circuit. A high-efficiency circulation pump and expansion tank are provided for both the brine side and the heating side. As standard, an electrical emergency/booster heater for monoenergetic operation and pasteurization, hot water diverter valve, and a safety valve with discharge hose are included. The refrigerant circuit is hermetically sealed, checked at the factory for tightness, and filled with the R410A safety refrigerant.

PERFORMANCE: The heat pump unit is fitted with a soft-starter scroll compressor and optimized heat exchangers for greater efficiency.

INSTALLATION: The internal pressure hoses enable direct hydraulic connection to the heating and brine circuits. For easy installation, the hydraulic connections are equipped with quick-release fittings and are already thermally insulated. The metal casing is corrosion-protected and made from galvanised, powder-coated sheet steel, with an alpine white stove enamel finish. Carrying handles on the back panel allows easy handling.

This appliance can be used in combination with a water to water heat exchanger.

Stiebel Eltron

WPF 13 S, WPF 13, WPF 16

Technical Data

Model WPF 20 WPF 27 WPF 35 WPF 40 WPF 52 WPF 66
Output at B0/W35 (EN 14511) 21.5 kW 29.69 kW 38.04 kW 43.1 kW 55.83 kW 67.10 kW
Coefficient of performance at B0/W35 (EN 14511) 4.66 4.85 4.78 4.67 4.81 4.56
Flow rate, heat source side 5 m³/h 7 m³/h 8.8 m³/h 10.5 m³/h 13 m³/h 16.1 m³/h
Nominal design flow rate of heating system at A-7/W35 and 7 K 2.65 m³/h 3.65 m³/h 4.48 m³/h 5.3 m³/h 6.86 m³/h 8.26 m³/h
Sound power level (EN 12102) 54 dB(A) 55 dB(A) 56 dB(A) 58 dB(A) 58 dB(A) 61 dB(A)
Sound pressure level at a distance of 1 m 43 dB(A) 44 dB(A) 45 dB(A) 47 dB(A) 47 dB(A) 50 dB(A)
Rated compressor voltage 400 V 400 V 400 V 400 V 400 V 400 V
Connections for the heating and source side G 2 G 2 G 2 G 2 G 2 G 2
Height 1154 mm 1154 mm 1154 mm 1154 mm 1154 mm 1154 mm
Width 1242 mm 1242 mm 1242 mm 1242 mm 1242 mm 1242 mm
Depth 860 mm 860 mm 860 mm 860 mm 860 mm 860 mm
Weight 345 kg 367 kg 391 kg 415 kg 539 kg 655 kg


File Category Type Download
WPF 20 Data Sheet Data Sheet PDF
348.96 kB
WPF 27 Data Sheet Data Sheet PDF
349.18 kB
WPF 35 Data Sheet Data Sheet PDF
349.06 kB
WPF 40 Data Sheet Data Sheet PDF
349.18 kB
WPF 52 Data Sheet Data Sheet PDF
349.14 kB
WPF 66 Data Sheet Data Sheet PDF
349.20 kB
WPF Operation and Installation Guide Operation and Installation Guide PDF
5.31 MB
WPF WPE-I Warranty 2020 Warranty PDF
110.91 kB
WPF 20-66 Line Drawing Technical Drawing PNG
44.85 kB
WPF 20_66 Exploded Diagram Technical Drawing PNG
29.40 kB

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