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Star-Z 20/4-3

Name: Star-Z 20/4-3
Brand: Wilo
SKU: 4081193

Glandless pump circulator

Article number: 4081193

Series Star-Z

	Glandless premium high-efficiency pump	Glandless standard high-efficiency pump	Existing pump



Description
Product description	Stratos PICO-Z 20/0,5-4	Yonos PICO-Z 20/0,5-4 150	Star-Z 20/4-3
Article number	4255430	4255412	4081193
Series	Stratos PICO-Z	Yonos PICO-Z	Star-Z
Mains connection	1~230 V ±10%, 50/60 Hz	1~230 V ±10%, 50/60 Hz	1~230 V ±10%, 50 Hz
Pump connection	G 1¼	G 1¼	G 1¼
Pump connection (alternative designation)	RP 3/4	RP 3/4	RP 3/4
	DN 20	DN 20	DN 20
Display	Graphic colour display (2 inches)	LED segment display	No display
Comment	Fits without modifications	Fits without modifications	-
Port-to-port length l0	150 mm	150 mm	150 mm
Operating data
Standard	-	-	-
Function
Control mode	Δp-c for constant differential pressure	Δp-c for constant differential pressure	-
	T-const. for constant temperature control	-	-
	Constant speed (n-const.)	Constant speed (n-const.)	-
	-	Constant speed (3 speed stages)	Constant speed (3 speed stages)
Special features of the series	Key locking function	-	-
	Reset function for electricity meter	-	-
	Reset function to factory setting	-	-
	Qmin for T const. control mode	-	-
	Automatic detection of thermal disinfection	-	-
Display	Setpoint	-	-
	Actual delivery head	-	-
	Actual volume flow	Actual volume flow	-
	Actual power consumption	Actual power consumption	-
	Energy consumption	-	-
	Actual speed	-	-
	Manually activated restart or pump venting function	-	-
	Warning messages in plain text (display status: yellow)	-	-
	Error messages in plain text (display: red)	-	-
	Control mode	-	-
	Active influences (e.g. STOP)	-	-
Pump venting function	Manual	Manual	-
Dry-running detection	yes	-	-
Equipment
Thermal insulation shell	Yes	Yes	-
Quick electrical connection	Wilo Connector	Wilo Connector	-
Blocking-current proof motor	yes	-	-
Key lock	yes	-	-
Operating elements	Green button and back button	Green button	-
Connectivity
Analogue signal as standard	0-10 V (via BMS Connect module accessories)	-	-
Digital output	SSM/SBM (via BMS Connect module accessories)	-	-
Digital input	Ext. OFF/Ext. MIN/ Ext. MAX (via BMS Connect module accessories)	-	-
Bus communication via additional accessories	Modbus RTU	-	-
Access via the Wilo-Assistant app	Via accessory Wilo-Smart Connect Module BT	-	-
wire data exchange and remote operation	Via accessories Wilo-Smart Connect Module BT	-	-
Motor data
Rated power P₂	15 W	15 W	46.8 W
Min. speed n_min	700 1/min	700 1/min	1000 1/min
Max. speed n_max	3400 1/min	3400 1/min	1900 1/min
Power consumption P_{1 min}	3 W	4 W	-
Power consumption P_{1 max}	20 W	20 W	72 W
Emitted interference	EN 61000-6-3	EN 61000-6-3	EN 61000-6-3
Interference resistance	EN 61000-6-2	EN 61000-6-2	EN 61000-6-2
Electromagnetic compatibility	EN 61800-3	EN 61800-3	EN 61800-3
Insulation class	F	F	F
Protection class	IPX4D	IPX4D	IP44
Phases	1	1	1
Mains connection	1~230 V, 50/60 Hz	1~230 V, 50/60 Hz	1~230 V, 50 Hz
Materials
Impeller	PPO-GF30	PPO-GF30	PPE-GF30
Shaft	Oxide ceramic	Oxide ceramic	Oxide ceramic
Bearing	Carbon-graphite	Carbon-graphite	Carbon, synthetic resin-impregnated
Material	Stainless steel	Stainless steel	Bronze, CC499K
Pipe connection
Inlet connection	G 1¼	G 1¼	G 1¼
PN connection on suction side	PN 10	PN 10	PN 10
Outlet connection	G 1¼	G 1¼	G 1¼
PN connection on discharge side	PN 10	PN 10	PN 10
Dimension, weight
Length with packaging	194 mm	194 mm	147 mm
Length L	156 mm	156 mm	134 mm
Height with packaging	121 mm	121 mm	100 mm
Height H	115 mm	115 mm	94 mm
Width with packaging	213 mm	213 mm	187 mm
Width W	164 mm	153 mm	154 mm
Gross weight, approx. m	2 kg	1.8 kg	2.4 kg
Net weight, approx. m	1.7 kg	1.5 kg	2.3 kg
Ordering information
Product description	Stratos PICO-Z 20/0,5-4	Yonos PICO-Z 20/0,5-4 150	Star-Z 20/4-3
Brand	Wilo	Wilo	Wilo
EAN number	4062679266053	4062679265803	4016322698043
Article number	4255430	4255412	4081193

Data sheet

Hydraulic data
Maximum operating pressure PN	10 bar
Delivery head for Qmin H _Qmin	4.7 m
Max. volume flow Q_max	3.7 m³/h
Min. fluid temperature T_min	2 °C
Max. fluid temperature T_max	65 °C
Min. ambient temperature T_min	0 °C
Max. ambient temperature T_max	40 °C
Max. permitted total water hardness	3.21 mmol/l (18°dH)

Motor data
Mains connection	1~230 V, 50 Hz
Rated power P₂	46.8 W
Rated current I_N	0.31 A
Max. speed n_max	1900 1/min
Power consumption P_{1 max}	72 W
Emitted interference	EN 61000-6-3
Interference resistance	EN 61000-6-2
Protection class motor	IP44
Insulation class	F
Threaded cable connection	1 x PG11
Motor protection	no

Materials
Pump housing	Bronze, CC499K
Impeller	PPE-GF30
Shaft	Oxide ceramic
Bearing	Carbon, synthetic resin-impregnated

Installation dimensions
Port-to-port length L0	150 mm

Ordering information

Product data
Brand	Wilo
Product description	Star-Z 20/4-3
Article number	4081193
EAN number	4016322698043
Colour	Green
Minimum order quantity	1
Date of sales availability	1900-01-01
Previous model article number	4092213
Previous model designation	Star-Z 15 TT
Successor model article number	4184690 4216470
Successor model designation	Stratos PICO-Z 20/1-4 PN 10 Stratos PICO-Z 20/1-4

Packaging
Packaging type	Cardboard box
Packaging property	Sales packaging
Pieces per pallet	256
Number per layer	32

Dimension, weight
Length with packaging	147 mm
Length L	134 mm
Height with packaging	100 mm
Height H	94 mm
Width with packaging	187 mm
Width W	154 mm
Gross weight, approx. m	2.4 kg
Net weight, approx. m	2.3 kg

This circulator is suitable only for drinking water.

Domestic hot water circulator, glandless pump with manual three-stage variable speed control for pipe installation.

Blocking-current proof motor. Pump housing made of bronze, impeller made of fibreglass-reinforced plastic, ceramic shaft with resin-impregnated carbon friction bearings.

Operating data
Max. fluid temperature T_max	65 °C
Min. fluid temperature T_min	2 °C
Min. ambient temperature T_min	0 °C
Max. ambient temperature T_max	40 °C
Temperature range at max. ambient temperature +40 °C T	+2...+65 °C
Maximum operating pressure PN	10 bar
Max. permitted total water hardness	3.21 mmol/l (18°dH)

Motor data
Emitted interference	EN 61000-6-3
Interference resistance	EN 61000-6-2
Mains connection	1~230 V, 50 Hz
Power consumption P_{1 max}	72 W
Max. speed n_max	1900 1/min
Rated current I_N	0.31 A
Protection class motor	IP44
Threaded cable connection	1 x PG11

Materials
Pump housing	Bronze, CC499K
Impeller	PPE-GF30
Shaft	Oxide ceramic
Bearing	Carbon, synthetic resin-impregnated

Installation dimensions
Pump connection	G 1¼
Pump connection (alternative designation)	RP 3/4 DN 20
Port-to-port length L0	150 mm

Ordering information
Brand	Wilo
Product description	Star-Z 20/4-3
Net weight, approx. m	2.3 kg
Article number	4081193

Filtered by

Document type

Installation and operating instructions [1]

Group Statement [1]

UKCA [1]

Language

English [1]

language neutral [2]

Deutsch (German) [1]

Български (Bulgarian) [1]

Čeština (Czech) [1]

Dansk (Danish) [1]

Datasheet and documentation

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Installation and operating instructions

Wilo-Star-Z/-ZD

Article Number	4236978
Issue date	2019-08
Edition	01
Language	ar, cs, de, el, en, es, fr, it, pl, ru, sv

Download (5 MB)

Group Statement

Group Statement REACH

Issue date	2021-05
References	REACH
Certification and inspection body	Self Declaration
Issue date	2026-04-17
Language	language neutral

Download (434 KB)

UKCA

UKCA 2223361-04

References	2223361-04
Certification and inspection body	Self Declaration
Issue date	2025-10-01
Language	language neutral

Download (161 KB)

Mechanical accessories

Pipe installation (1)
Screwed connections/adapters
	Screwed connection Rp ¾ x G 1¼, 1 Set	4233251	GBP 49.-


Thermal insulation (1)
Size 14 thermal insulation shell
	Thermal insulation shell (Size 14)	4046444	GBP 35.-

With Wilo as your partner, you can not only be sure of choosing high-quality product solutions, but also of benefiting from a comprehensive, worry-free package of well thought-out services. We collaborate to develop a service concept tailored to your individual needs; with our expertise and personal consultancy, we make sure that the operation of your systems is as energy-efficient, reliable and economical as possible. All the while our competent Wilo service technicians are ready to assist you with fast, reliable and on-time support.

Extended Warranty
	Extended Warranty Glandless pumps	2219589	GBP 2.-

Supervision
	Supervision Glandless pumps	2219320	GBP 2.-

Installation
	Installation Glandless pumps	2219355	GBP 2.-

Commissioning
	Commissioning Glandless pumps	2219390	GBP 84.-

Maintenance
	Maintenance BASIC Glandless pumps	2219530	GBP 375.-
	Maintenance COMFORT Glandless pumps	2219416	on request
	Maintenance PREMIUM Glandless pumps	2219545	GBP 2.-

System Optimisation
	System Optimisation Glandless pumps	2219250	on request

Energy Solutions
	Energy Solutions Glandless pumps	2219285	GBP 2.-

Repairs
	Repair Glandless pumps	2219609	GBP 2.-