GDA311, Wilo pump
GDA311, Wilo pump

Circulation unit

GDA300

The ESBE series GDA300 is a direct supply circulation unit designed for applications, where the energy transport in the most efficient way is required. Equipped with two shut-off valves with thermometers, check valve, high class insulation shell and high efficiency circulation pump. You can be sure that ESBE delivers the best circulation unit for both your economy as well as for the environment. It is simply the most efficient direct supply unit available. When designing the circulation unit product line the focus at ESBE has been to simplify installation. This goes through the whole product from pre assembly, mounting brackets and insulation to packaging design.
  • High efficiency circulation pump
  • High class insulation shell
  • Pre tested and ready to use
  • Compact design

Product range

GDA311 front_A-01
GDA311
GDA311 side_A-01
Series GDA311
Art.no.ReferenceDNPumpConnection IConnection JWeight kgNoteNTCNTC = National Trade Code
61003100GDA31120Wilo 15/7,5G ¾"G 1"3.7  

Installation support

Installation examples
GxA300_B-01
Installation instruction GDA300

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, Cast iron, Steel 
Sealings material of: PTFE, Aramid fibre, EPDM 
EEI (Energy Efficiency Index), Wilo circulation pump: <0,21 
The integrated Circulation pump: Type: Wilo RSTG 15/7,5 
Power supply: 230±10% VAC, 50/60Hz 
Cable length: 3 m
Power consumption: 4-75 W
Enclosure rating: IP X4D 
Insulation class: F 
EEI (Energy Efficiency Index): <0,21 
Characteristics: See diagram 
Conformity CE_A-01
LVD 2014/35/EU
EMC 2014/30/EU
RoHS 2011/65/EU
PED 2014/68/EU, article 4.3
ErP2015_A-01
ErP2009/125/EC
ErP2015
$name
EnEV2014
. blank-01
Circulation pump Wiring LTC100_A-01
The circulation pump should be preceded by a multi-pole contact breaker in the fixed installation.
GxA300_elkoppling PWM-01
Pumpspeed could be controlled by PWM signal
Constant speed GDA300 Constant dimensioning_A_en-01
Dimensioning, Pump Capacity diagram
Example: Start with the heating demand of heating circuit (e.g. 25 kW) and move horizontally to the right in the diagram to the Δt = 15°C (temperature difference between flow and return of the heating circuit). Next go up and find working point and read the available pressure of the pump on the left – ∆p = 65 kPa.
Variable pressure GDA300 Variable dimensioning_A_en-01

Accessories and spare parts

Options
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

GMA321

Manifold for 2 circulation units, without integrated hydraulic separator function.
66000500GMA321Manifold GMA321, DN20 Manifold for 2 units.

GMA331

Manifold for 3 circulation units, without integrated hydraulic separator function.
66000600GMA331Manifold GMA331, DN20 Manifold for 3 units.
Spare parts
ImageArt.no.ReferenceDesignationNational trade codeNoteData sheetInstructions manual

GSP931

ESBE GSP931 Pump RSTG 15/7,5 Wilo
67003100GSP931Pump RSTG 15/7,5 Wilo    

GSP903

ESBE GSP903 Thermometer upgrade set, 2 pcs/package
67000600GSP903Thermometer upgrade set, 2 pcs/package    

GSP932

ESBE GSP932 PWM cable Wilo RSTG, 3m
67003900GSP932PWM cable Wilo RSTG, 3m    

GSP933

ESBE GSP933 Ball valves incl thermometer DN 20, 2 pcs/package
67003300GSP933Ball valves incl thermometer DN 20, 2 pcs/package DN20  

GSP930

ESBE GSP930 Insulation circulation unit DN 20
67003000GSP930Insulation circulation unit DN 20    

Download area

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Data sheet GDA300
Installation instruction GDA300
2D Image GDA311
3D drawing (stp file) GDA311, DN20

Related products

GMA321

GMA300

Series GMA300 is manifolds for 2 or 3 circulation units including insulation according to EnEV2014 and wall brackets.
GMA321

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