GSC111, Wilo pump GSC112, Grundfos pump GSC121, Wilo pump GSC122, Grundfos pump
GSC111, Wilo pump GSC112, Grundfos pump GSC121, Wilo pump GSC122, Grundfos pump

Return temperature unit

GSC100

The ESBE series GSC100 is a return temperature unit designed for applications, where the return temperature control is required. Equipped with two shut-off valves with thermometers, check valve, high class insulation shell and high efficiency circulation pump. The GSC100 is delivered with constant temperature controller for high accuracy control. The Return temperature unit is available with 3-way rotary mixing for the best regulation performance or bivalent rotary mixing valve for the perfect stratification and quick accumulation tank load.
  • Constant temperature high accuracy control
  • 3-way or bivalent mixing valve
  • System pre balance
  • Perfect stratification and efficient load of the accumulation tank

Product range

GSC1x1 front_A-01
GSC111, GSC121
GSC1x1 side_A-01
GSC1x2 front_A-01
GSC112, GSC122
GSC1x2 side_A-01
Series GSC110, 3-way rotary mixing valve
Art.no.ReferenceDNPumpTemperature range °CConnection IConnection JWeight kgNoteNTCNTC = National Trade Code
61140200GSC11125Wilo 25/65-95°CG 1"G 1½"6.0  
61140400GSC11132Wilo 25/7.55-95°CG 1¼"G 1½"7.4  
61140600GSC11225Grundfos 25-505-95°CG 1"G 1½"6.1  
61140800GSC11232Grundfos 25-705-95°CG 1¼"G 1½"7.5  
Series GSC120, Bivalent rotary mixing valve
Art.no.ReferenceDNPumpTemperature range °CConnection IConnection JWeight kgNoteNTCNTC = National Trade Code
61160100GSC12125Wilo 25/65-95°CG 1"G 1½"6.0  
61160200GSC12132Wilo 25/7.55-95°CG 1¼"G 1½"6.5  
61160300GSC12225Grundfos 25-505-95°CG 1"G 1½"6.0  
61160400GSC12232Grundfos 25-705-95°CG 1¼"G 1½"6.6  

Installation support

Installation examples
Return Temp unit_Appl1-01
$name
Installation instruction GSC100
Installation instruction GSC100, Wilo Pump
Installation instruction GSC100, Grundfos Pump

Technical data

Technical data
Pressure class: PN 6 
Media temperature, max.: +110 °C
min.: 0 °C
Ambient temperature, max.: +50 °C
min.: 0 °C
Working pressure: 0.6 MPa
Connections, Internal thread (G): ISO 228/1 
External thread (G): ISO 228/1 
Insulation: EPP λ 0.036 W/mK 
Media, Heating water  (in accordance with VDI2035) 
Water/Glycol mixtures, max. 50 %
(above 20% admixture, the pump data must be checked)  
Water/Ethanol mixtures, max. 28 %
Material, in contact with water Components of: Brass, Iron, Copper 
Sealings material of: PTFE, Aramid fibre, EPDM 
Conformity: PED 2014/68/EU, article 4.3 
The integrated 3-way Mixing valve, series GSC110 Max. differential pressure drop: 100 kPa
Close off pressure: 200 kPa
Rangeability Kv/Kv min, A-AB: 100 
Leakrate in % of flow*: <0.05 %
* Differential pressure 100kPa (1 bar) 
Characteristics: See diagram 
The integrated Bivalent mixing valve, series GSC120 Max. differential pressure drop: 100 kPa
Close off pressure: 200 kPa
Rangeability Kv max/Kv min, A-AB: 100 
Leakrate in % of flow*: <0.05 %
* Differential pressure 100kPa (1 bar) 
Characteristics: See diagram 
The integrated Controller Temperature range: +5 to +95 °C
Power supply: 230±10% VAC, 50 Hz 
Power consumption: 10 VA
Running time at max. speed: max. 30 s
Enclosure rating: IP41 
Protection class: II 
The integrated Circulation pump Power supply: 230±10% VAC, 50/60Hz 
Power consumption - Wilo 25/6: 3-45 W
Power consumption - Wilo 25/7.5: 3-76 W
Power consumption - Grundfos 25-50: 2-34 W
Power consumption - Grundfos 25-70: 2-53 W
Enclosure rating: IP X4D 
Insulation class: F 
Characteristics: See diagram 
Conformity CE_A-01
LVD 2014/35/EU
EMC 2014/30/EU
RoHS 2011/65/EU
ErP2015_A-01
ErP 2009/125/EC
ErP 2015
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EnEV 2014
blank-01
Valve characteristics, series GSC110 VRG330_GB_A-01
Valve characteristics, series GSC120 VRB140_GB_A-01
Wiring, Controller CRA_wiring_verA-01
Circulation pump Wiring LTC100_A-01
The circulation pump should be preceded by a multi-pole contact breaker in the fixed installation.
GSC110: Available pressure, Wilo pump $name
Dimensioning, Pump Capacity diagram
Example: Start with the heat output of the boiler (e.g. 40 kW) and move horizontally to the right in the diagram to the chosen Δt (recommended by boiler supplier), which is the temperature difference between the riser from the boiler and the return to the boiler (e.g. 85°C - 65°C = 20°C).
Move vertically up to the curves representing load unit performance. Check that the pump curve overcomes the additional pressure drops in system components such as pipes, boiler and storage tank.
GSC120: Available pressure, Wilo pump $name
GSC110: Available pressure, Grundfos pump $name
GSC120: Available pressure, Grundfos pump $name

Accessories and spare parts

Spare parts
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

GSP902

ESBE GSP902 Thermometer 2pcs
67000200GSP902Thermometer 2pcs   

GSP901

ESBE GSP901 Pump RKA 25/6 Wilo
67000100GSP901Pump RKA 25/6 Wilo DN25 

GSP901

ESBE GSP901 Pump RKA 25/7.5 Wilo
67000300GSP901Pump RKA 25/7.5 Wilo DN32 

GSP901

ESBE GSP901 Pump UPM3 25-50 Grundfos
67000400GSP901Pump UPM3 25-50 Grundfos DN25 

GSP901

ESBE GSP901 Pump UPM3 25-70 Grundfos
67000500GSP901Pump UPM3 25-70 Grundfos DN32 

Download area

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Data sheet GSC100
Installation instruction GSC100
Installation instruction GSC100, Wilo Pump
Installation instruction GSC100, Grundfos Pump
2D Image GSC111, GSC121
2D Image GSC112, GSC122
3D drawing (stp file) GSC111, DN25
3D drawing (stp file) GSC111, DN32
3D drawing (stp file) GSC112, DN25
3D drawing (stp file) GSC112, DN32
3D drawing (stp file) GSC121, DN25
3D drawing (stp file) GSC121, DN32
3D drawing (stp file) GSC122, DN25
3D drawing (stp file) GSC122, DN32