Circulation unit, Fixed temperature


  • Thermostatic constant temperature control
  • Adjustable temperature setting
  • High class insulation shell
  • High efficiency circulation pump
  • Compact design

The ESBE series GFA300 is a circulation mixing unit designed for heating circuits, where the constant temperature control is required. Equipped with two shut-off valves with thermometers, check valve, high class insulation shell and high efficiency circulation pump.

The GFA300 is delivered with the 3-way thermostatic mixing valve for constant temperature control of the heating circuit. The thermostatic mixing valve has adjustable temperature setting.

Product range

GFA311 Reference DN Pump Temperature range [°C] Connection I Connection J Weight [kg] Note
61023100 GFA311 20 Wilo RSTG 15/7,5 20–55 G ¾" G 1" 4,0
Installation support

Installation examples

Installation examples


Technical data

Technical data

Pressure class: PN 6
Working pressure: 0,6 MPa
Insulation: EPP λ 0,036 W/mK
EEI (Energy Efficiency Index), circulation pump: <0,21
Cable length: 3m
Media, Heating water: in accordance with VDI2035
Media, Water/Glycol mixtures: max. 50 % (above 20% admixture, the pump data must be checked)
Media, Water/Ethanol mixtures: max. 28 %
Media temperature, max.: +110 °C
Media temperature, min.: 0 °C
Ambient temperature, max.: +50 °C
Ambient temperature, min.: 0 °C
Connections, Internal thread (G): ISO 228/1
Connections, External thread (G): ISO 228/1
Material, in contact with water Components: Brass, Cast iron, Steel
Sealing materials: PTFE, Aramid fibre, EPDM

Integrated pump

Wilo RSTG 15/7,5
Power supply 230 ± 10% V AC, 50/60 Hz
Power consumption 4 — 75 W
Enclosure rating IP X4D
Insulation class F
EEI (Energy Efficiency Index), circulation pump <0,21

Integrated valve

max. Differential pressure drop 100 kPa (1bar)
Temperature range 20 - 55⁰C
Temperature stability ±3⁰C*
* * Valid at unchanged hot/return water pressure, minimum flow rate 9 l/min. Minimum temperature difference between hot water inlet and mixed water outlet 10°C and recommended maximum temperature difference between return water and mixed water outlet: 10°C
LVD 2014/35/EU
EMC 2014/30/EU
RoHS3 2015/863/EU
PED 2014/68/EU, article 4.3


Dimensioning guide - Please see data sheet


Please see the Installation instruction
Accessories and Spare Parts

Spare parts

Art No. Reference Designation Note Data sheet Instruction manual
67003500 67003500 GSP933 ESBE GSP933 Ball valve DN 20 DN20 download download
67000600 67000600 GSP903 ESBE GSP903 Thermometer upgrade set, 2 pcs/package download download
67003300 67003300 GSP933 ESBE GSP933 Ball valves incl thermometer DN20 G¾", 2 pcs/package DN20, G¾" download download
67003800 67003800 GSP933 ESBE GSP933 Ball valves incl thermometer DN20 G1", 2 pcs/package DN20, G1" download download
67003000 67003000 GSP930 ESBE GSP930 Insulation circulation unit DN 20 download download
67003100 67003100 GSP931 ESBE GSP931 Pump RSTG 15/7,5 Wilo download download
67003900 67003900 GSP932 ESBE GSP932 PWM cable Wilo RSTG, 3m download download


Art No. Reference Designation Note Data sheet Instruction manual
66000600 66000600 GMA331 ESBE GMA331 Manifold for 3 circulation units, without integrated hydraulic separator function. DN20 download download
66000500 66000500 GMA321 ESBE GMA321 Manifold for 2 circulation units, without integrated hydraulic separator function. DN20 download download
Download area

Download area

Type Preview Download
Data sheet GFA300 download
Installation instruction GFA300 (en, pl, ru, sv) download
Installation instruction GFA300 (de, en, es, fr, it, nl) download
Certificate Declaration of Conformity, GFA300 download
Certificate Declaration of Conformity UK CA, GFA300 download
Certificate Building Product Declaration BPD3, GFA300 download
Certificate EAC certificate (RU) download
Certificate UKRSEPRO certificate (UA) download
Image GFA311, high res download
2D Image GFA311 download
3D drawing (stp file) GFA311, DN20 download