Grundfos Horizontal CM5-4 Water Pumps

Grundfos CM5-4 Single Phase Horizontal Water Pump
Grundfos offers Compact, reliable, horizontal, multistage, end-suction centrifugal pumps with axial suction port and radial discharge port suitable for domestic as well as small commercial applications. The shaft, impellers and chambers are made of stainless steel. The inlet and discharge parts are made of cast iron. The mechanical shaft seal is a special designed, unbalanced O-ring seal. Pipework connection is via internal Whitworth pipe threads, Rp (ISO 7/1).

The Grundfos pump is fitted with a 1-phase, foot-mounted, fan-cooled asynchronous motor.


Product Description

Pump and motor are integrated in a compact and user-friendly design. The pump is fitted to a low base plate, making it ideal for installation in systems where compactness is important. The state-of-the-art design and materials of the shaft seal ensure high wear resistance, improved sticking and dry-running capabilities and long operating life.

Product Specifications

  • Manufacturer: Grundfos
  • Rated voltage: 220-240 V V
  • Rated speed: 2720-2800 rpm
  • Rated flow: 1.306 l/s
  • Resulting head: 25.44 m
  • Rated head: 30.69 m
  • Material: Stainless steel
  • Gross weight: 16.1 kg

About the Pump

A combination of a stop ring and a Nord-lock® washer secures a tight and reliable fixation of the impeller spacing pipes to the splined pump shaft. It is possible to remove and fit the hydraulic parts from the pump side. The inlet part, chambers and discharge part are hold together by four stay bolts.
The pump is fitted with an unbalanced O-ring seal with a rigid torque-transmission system. It has a fixed seal driver
ensuring a reliable rotation of all parts. The dynamic secondary seal is an O-ring.

Primary Seal:

  • Rotating seal ring material: aluminium oxide (alumina)
  • Stationary seat material: carbon graphite, resin-impregnated

Carbon graphite against alumina is a good all-round seal for not too demanding applications. The corrosion resistance is often limited in water to a range between pH 5 and pH 10. Usage in liquids above 90 °C is not recommended. The seal can handle dry-running conditions for short periods.

Secondary seal material:
EPDM (ethylene-propylene rubber)
EPDM has excellent resistance to hot water. EPDM is not suitable for mineral oils.


The motor is a totally enclosed, fan-cooled motor with principal dimensions to EN 50347. Electrical tolerances comply with EN 60034.

Technical data



There are no reviews yet.

Be the first to review “Grundfos Horizontal CM5-4 Water Pumps”

Your email address will not be published. Required fields are marked *