Catalogue creation
My favorites
Product comparison
Wilo-PB | Wilo


Safe and stable pressure boosting for the residential environment.

Your advantages
PB-400 EA

Safe and stable pressure boosting for the residential environment.

The Wilo-PB is a non-self-priming, single-stage centrifugal pump for automatic water supply and pressure boosting. It is suitable for the descending installation of roof-mounted water tanks (e.g. elevated tanks) to the extraction points of the water supply below in semi-detached/detached houses. It is the ideal pump for low or fluctuating water pressure within public water supply networks. Thanks to automatic mode, it always ensures stable water pressure.

Your advantages

  • Dry-running protection for high operational reliability
  • High reliability thanks to automatic mode and corrosion protection through coated hydraulics
  • Standardised design for easy installation
  • Compact design and low-noise operation (55 dBA) for domestic applications
  • Low power consumption thanks to automatic control
Series description


Circulating pump


  • Residential pressure boosting from a water tank


  • Directly flanged motor
  • Thermal motor protection switch for 1~230V version
  • Flow sensor for automation of versions PB-…A
  • Flow sensor, Pressure switch and pressurized tank for automation and protection of versions PB-…S…A




PB for Pump Boosting

Pump type

S for plastic, C for coating

Functional or material characteristic

25*10 = 250W


2 for third generation

Serie number

S for small, N for normal and L for large

Tank size

E for 50Hz, M for 60Hz


A for automatic

Automatic device

Technical data

  • Mains connection 1~230 V, 50 Hz (for …E versions)
  • Mains connection 1~220 V, 60 Hz (for …M versions)
  • Connection (pressure and suction side): from ¾’’ up to 1 ¼’’ – Depending on the models
  • Fluid temperature from 5°C to +80°C [for PB-(S)…A]
  • Fluid temperature from 5°C to +60°C [for PB-…S…A]
  • Ambient temperature from 0°C to +40°C
  • Storage temperature from -20°C to +60°C
  • Max. inlet pressure: From 0.45 bars up to 1.0 bars – Depending on the models
  • Max. outlet pressure: From 1.35 bars up to 3.1 bars – Depending on the versions
  • Switch-on flow: 2l/min (only for PB-(S)…A)
  • Switch-on pressure: 0.8 bars for PB-250SEA / 1.1bars for PB-401SEA
  • Switch-off flow: 2l/min for PB-(S)…A versions
  • Switch-off flow: 5l/min for PB-…S…A versions
  • Protection class 1~: IP X4


  • Pump housing: EN-GJL-200 for PB-…A and PB-…S…A
  • Pump housing: mPPO GF30 for PB-S…A
  • Impeller: mPPO GF30 and mPPO GF20 (depending on versions)
  • Terminal box cover: ABS
  • Impeller cover: Brass
  • Shaft: Stainless steel 1.4006
  • Mechanical seal: Carbon/ Ceramic

Scope of delivery

  • Pump
  • Installation and operating instructions
  • Accessary assembly (2 sets of unions, nipple, gasket for piping, for PB-201EA & PB-350MA only)
  • Accessary assembly (2 sets of flanges, gasket, for SEA/SMA type only)

Installation and operating instructions


Article Number 3076725
Edition 2018-01
Page format 209.9 x 297.0 mm
Number of pages 72
PDF (3 MB)

General overview

General Overview 2023 - International version

Edition 2022
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (24 MB)

Certificate REACH

REACH Regulation

Edition 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (262 KB)

Product list
Product descriptionMains connectionRated power P2Gross weight, approx. mArticle number
1~230 V, 50 Hz
0.06 kW
5.5 kg
1~230 V, 50 Hz
0.2 kW
9.5 kg
1~230 V, 50 Hz
0.4 kW
12.5 kg