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Wilo-Isar MODH1-1 | Wilo
Your advantages

Your advantages

  • High operational reliability, thanks to system with one, two or three horizontal multistage CH1-L pumps with stainless steel hydraulics
  • Easy installation and maintenance thanks to special, flexibly adjustable connections to manifolds
  • Easy commissioning and operation with the Easy Controller
  • Drinking water approval (ACS and KTW) for pumps with components made of stainless steel that come into contact with the fluid
Series description


Pressure-boosting system with 1, 2 or 3 non-self-priming stainless steel high-pressure multistage centrifugal pumps switched in parallel


  • Fully automatic water supply and pressure boosting in inlet mode, either from the public water supply network or from a tank, for domestic, commercial, industrial and municipal applications (e.g. residential, office, administration buildings, hotels, hospitals, trades, industry, water supply companies).
  • Pumping drinking water, process water, cooling water or other industrial water, which does not affect the materials used, neither chemically nor mechanically, and does not have any abrasive or long-fibre constituents


  • 1 – 2 or 3 CH1-L pumps per system
  • Components that come in contact with the fluid are corrosion-resistant
  • Electrogalvanized base frame with height-adjustable vibration absorbers for insulation against structure-borne noise
  • Stop valve on every pump on the suction and pressure sides
  • Non-return valve, pressure side
  • Pressure sensor, on the discharge side
  • Pressure gauge optional, on the suction side
  • Pressure gauge, discharge side
  • Low-water cut-out switchgear, optional
  • EC-control with IP54 plastic housing, consisting of an internal power supply unit, microprocessor, analogue and digital input and output modules



Wilo-Isar MODH1-1CH1-L-202/EC




Multistage booster


Commercial series


Pressure-boosting system with horizontal pumps


Product level (1 = entry, 3 = standard, 5 = premium)


Number of pumps


Pump series


Rated volume flow [m3/h] of the single pump


Number of single pump stages


Control panel (Easy Controller)

Technical data

  • 3~400 V ± 10 %, 50 Hz; 3~380/440 V ±10 %, 60 Hz mains connection, depending on type also 1~230 V, 50/60 Hz (other versions on request)
  • Max. fluid temperature 50 °C (70 °C optional)
  • Max. ambient temperature 40 °C
  • Operating pressure 10 bar
  • Inlet pressure 6 bar
  • Nominal connection diameter, on the discharge side R 2"/DN 100
  • Nominal connection diameter, on the inlet side R 2"/DN 100
  • Protection class IP54
  • Fuse protection on mains side A, AC 3 according to motor power and EVU regulations
  • Approved fluids (other fluids on request). Approved fluids are generally waters which do not attack the materials used, neither chemically nor mechanically, and do not contain any abrasive or long-fibre constituents.
  • Cooling water
  • Drinking and process water


Single pump:

  • Impellers, stage chambers and pump housing made of stainless steel 1.4301/1.4404
  • Shaft of stainless steel 1.4404
  • EPDM gasket (EP851)/FKM (Viton)
  • Mechanical seal made of tungsten carbide/carbon
  • Bearing of tungsten carbide
  • Pump support foot made of aluminium


  • Base frame: electrogalvanized and provided with height-adjustable vibration absorbers for comprehensive insulation against structure-borne noise; other versions on request
  • Pipework: complete pipework made of stainless steel, suitable for the connection of all piping materials used in building services; the pipework dimensions must correspond to the overall hydraulic performance of the pressure-boosting system
  • Pumps: 1 – 2 or 3 pumps of the CH1-L series 2.., 4.., 6.., 10.., 16.. switched in parallel; all pump components that come in contact with the fluid are made of 1.4301/1.4404 stainless steel
  • Valves: each pump is equipped on the suction and pressure side with a stop valve or with annular shut-off valves and a pressure-side non-return valve
  • Diaphragm pressure vessel: 8 l/PN 10 located on the discharge side with a butyl rubber diaphragm, completely safe in accordance with food safety laws; for testing and inspection purposes, with a ball valve, as well as drain and throughflow fitting according to DIN 4807
  • Pressure sensor: 4 to 20 mA, on the discharge side for activating the central EC-controller
  • Pressure indication: Pressure gauge (ø 63 mm) on the discharge side; additional digital display of the discharge pressure in the alphanumeric display of the EC-controller
  • Controller: the system is standard-equipped with an EC-controller

Delivery state

  • Factory-mounted, ready for connection pressure-boosting system checked for functionality and impermeability
  • Packaging
  • Installation and operating instructions

Installation and operating instructions


Article Number 2552132
Edition 2019-11
Page format 209.9 x 297.0 mm
Number of pages 1167
PDF (271 MB)

Wilo Isar-MODH1#Wilo Isar-MODV1

Article Number 2552079
Edition 2021-04
Page format 209.9 x 297.0 mm
Number of pages 64
PDF (8 MB)

Wilo-Control EC/ECe-Booster

Article Number 2549070
Edition 2019-07
Page format 209.9 x 297.0 mm
Number of pages 1212
PDF (11 MB)

General overview (Documents)

General overview 2021 International version

Edition 2020
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (10 MB)

Certificate REACH (Documents)

REACH Regulation

Edition 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (212 KB)
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