High-efficiency brine-to-water heat pump
18kW High-efficiency ground-to-water heat pump SI18TU
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18kW High-efficiency ground-to-water heat pump SI18TU


18kW High-efficiency ground-to-water heat pump SI18TU


High efficiency ground source heat pump with economiser and electronic expansion valve. Designed for indoor installation.
• Integrated flow and return sensor and WPM Econ5Plus heat pump manager. Supplied with external sensor.
• Reduced operational noise through encapsulated compressor housing and free-swinging compressor base plate.
 Supplied with soft starter and brine circuit filter

  • .

Other options are available for this product.


Heat pump for heating purposes for indoor installation with integrated WPM Econ5Plus control. Variable connection options for brine and heating connections on the back board of the casing. Integrated solid-borne sound insulation for direct connection to the heating system. Sound-optimised through encapsulated compressor housing and free-swinging compressor baseplate. High coefficients of performance (COPs) thanks to electronic expansion valve, COP booster and compliance with the requirements of EN 14511 for larger volume flows on the heat consumption side. Sensor monitoring of the refrigeration circuit for a high degree of operational safety and integrated thermal energy metering (display of the calculated quantity of thermal energy for heating and domestic hot water preparation on the WPM Econ5Plus heat pump manager). The control panel is integrated in a design screen and can also be used as wired remote control using the wall mounting set (special accessories MS PGD). Universal design with optional domestic hot water preparation and flexible expansion possibilities for:


  • Bivalent or bivalent-renewable operating mode
  • Distribution systems with unmixed and mixed heating circuits
  • Use of load-variable tariffs (SG Ready)

Flow and return sensor integrated; external sensor (standard NTC-2) in the scope of supply. Dirt trap for installation in the brine circuit (return to the heat pump) included in the scope of supply. High-efficiency brine package with electronic control of the brine pump and the brine circuit manifold must be ordered separately.


Technical Specifications

Key Features
Colour/Finish/MaterialWhite (similar to RAL 9016)
InstallationIndoors - Non domestic – The SI TU range uses a three phase electricity supply, making them suitable for a range of non-domestic/ commercial applications with heat load demands up to 130kW.
Outside Air Temperature Range (oC)-5 / +25
Product Identification
Product model numberSI18TU
Height (mm)845.00
Depth (mm)665.00
Width (mm)650.00
Weight (kg)163.00
Additional Features
Electric supply400V