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Product code: MXH 20,32,48 Series

Calpeda MXH 20,32,48 Series Horizontal Multistage Pump

Pump Type - Multistage

Max Flow Rate - 66M³H

Max Head - 89M

Pump Materials - AISI304

Max Temp - 110°C

Max Viscosity - 10 cst

Max Solid Passage - 0mm

Self Priming - N

Inlet/Outlet Sizes - 38mm to 80mm

Drive - AC Electric

Max Suction Lift - 0



Calpeda MXH 20,32,48 Series Horizontal Multistage Pump


Flow Rate

Up to 66m³/hr

Head (Pressure)

Up to 89m

Inlet/Outlet Sizes

1 1/2” to 3”

Operating Temperature

-15°C to +110°C

Drive Options

Electric Motor



The Calpeda MXH 20,32,48 series of horizontal multistage pump is constructed from stainless steel 304 and is WRAS approved. It is close coupled and compact, suitable fluids are clean without solids or abrasives and are compatible with stainless steel (also check seal material compatibility).


The largest multistage pump model is capable of producing high pressures up to 8.9 bar due to its multi impeller design. Any applications involving clean fluids that require high pressure at medium to high flow rates are excellent for this Calpeda pump. Common applications for the MXH 20,32,48 pump range include; domestic, pressure boosting, irrigation, garden use and civil.


This Calpeda pump range is available with flanged or Victaulic ports.

Motor options include 230V, 400V three phase and 400V, 690V three phase 50Hz, other voltages and 60Hz motors are available on request. A special version with an integrated inverter (VFD) is also available on request.

Product Summary


         Horizontal close coupled multistage pump

         Compact design

         WRAS approved

         Single piece, thick barrel casing

         Suitable for clean fluids without solids or abrasives

         Lantern bracket between pump and motor to help protect against fluid leakage into the motor

         Constructed in stainless steel 304

         Available with flanged or Victaulic ports

         Motor options include; 230V/400V/3Ph/50Hz, 400V/690V/3Ph/50Hz, other voltages and 60Hz available on request

         Available with integrated inverter (VFD) on request

         Filling and drain plugs on pump casing

         IP54 as standard, IP55 available on request

         Special mechanical seals available on request

Read more about Multistage Pumps in our Guide


A clear picture of the pump system is required to make an accurate selection. The main pieces of information required include; a description of the application, bore of pipework, the fluid, flow rate and pressure/head. With these pieces of information, a pump can be sized correctly to ensure it delivers the required flow rate and pressure and that is also operates at its best efficiency point to lower lifetime costs. Knowing if the pump is running intermittently or continuously also allows the correct motor speed to be selected. For instance, a pump running continuously 24/7 will require a 4 pole motor rather than a 2 pole motor. Running the motor slower and oversizing the pump will reduce wear of the motor and the pump, therefore lowering maintenance costs during their lifetime.
Centrifugal pumps typically have only one impeller, whereas a multistage pump has multiple impellers or stages of impellers back to back. Installing the impellers in this way allows the pump to generate much higher pressures. Multistage pumps are perfect for applications that require higher pressures or a combination of high pressure and low to medium flow rates.
The Water Regulations Advisory Scheme (WRAS) is a standard set of by the water regulations board in the United Kingdom. WRAS is a mark that shows that a component used with water in a public water supply complies with this standard.
No, definitely not! Multistage pumps will incur damage even after short periods of dry running. The mechanical seal will be destroyed, and this will cause the pump to leak. There is also the possibility that the motor will burn out. Our advice is to ensure that the pump has a flooded suction or always make sure that the pump casing and inlet pipe are filled with water; one way of ensuring this is to fit a check valve on the inlet line to stop water escaping when the pump is inactive. Another way of protecting the pump is to fit a dry running device, this will turn the pump off if it detects that no fluid is entering the pump. If you think that dry running is inevitable, then please speak to us and we will try to select a more suitable pump for your application.
NPSH is an acronym for Net Positive Suction Head. NPSH measures the absolute pressure present in a fluid.

There are two main ways that NPSH is expressed in a pump system

NPSHa - This is the amount of Net Positive Suction Head available at the pump inlet. NPSHa demonstrates the amount of pressure acting on a fluid as it enters the pump. This measures the amount of pressure between the liquid staying in its current state and forming vapour bubbles (beginning to boil).

NPSHr - This is the amount of Net Positive Suction Head that the pump requires to operate without experiencing the damaging effect of cavitation, thus causing a dramatic reduction in pump performance.

It is very important to pay attention to these values when making a pump selection. Selecting a pump that requires more NPSH than is available in your system will cause fast and long-lasting damage to the pump and thus you will incur large repair costs and downtime.
The best efficiency point or BEP is a point along the pump performance curve that indicates where efficiency for the pump peaks. When selecting a pump, you must try and get as close to the BEP as possible to ensure that the pump is at maximum efficiency when operating. The closer to the BEP the pump is when operating, the lower the energy costs will be, thus saving significant amounts of money during the pump’s lifetime. Also, vibrations will be at their lowest meaning maintenance costs are lower and the lifespan of the pump is maximised. It is very important to pay attention to the BEP when your pump is selected, as an oversized or undersized pump could cost you significant amounts of money.
Our Calpeda multistage pumps can be supplied complete with integrated frequency drive for controlling the pump speed. The built in I-MAT system is extremely compact and allows for various control features. Please refer to the product information, data sheet or talk to a member of our sales team for information on control features.


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