USA
Catalog   /   Climate, Heating, Water Heating   /   Water Supply & Pumps   /   Surface Pumps

Comparison Wilo Jet WJ 203 vs Wilo Jet WJ 202

Add to comparison
Wilo Jet WJ 203
Wilo Jet WJ 202
Wilo Jet WJ 203Wilo Jet WJ 202
Outdated ProductOutdated Product
TOP sellers
Suitable forclean waterclean water
Specs
Maximum performance
5000 L/h /maximum/
4500 L/h /maximum/
Maximum head
42 m /maximum/
37 m /maximum/
Max. pressure6 bar6 bar
Pump typecentrifugalcentrifugal
Suction typeself-primingself-priming
Suction height7 m7 m
Maximum liquid temperature35 °С35 °С
Dry run protection
Suction systemsingle-stagesingle-stage
Outlet size1"1"
Inlet hole size1"1"
Engine
Maximum power750 W650 W
Power sourceelectricelectric
Mains voltage230 V230 V
General specs
Protection class (IP)4444
Country of originGermanyGermany
Pump housing materialstainless steelstainless steel
Impeller / auger materialstainless steelstainless steel
Dimensions184x290x354 mm184x290x354 mm
Weight10.6 kg9.6 kg
Added to E-Catalogjanuary 2016january 2016

Maximum performance

The maximum volume of water that the device can pump in a certain amount of time. It is one of the key specs of any pump because characterizes the volume of water with which the device can work. At the same time, it does not always make sense to pursue maximum performance — after all, it significantly affects the dimensions and weight of the unit.

Some formulas allow you to derive optimal performance values for different situations. So, if the pump is designed to supply water to water intake points, its minimum required performance should not be lower than the highest total flow rate; if desired, a margin of 20-30% can be added to this value. And for sewer models (see "Suitable for"), everything will depend on the volume of wastewater. More detailed recommendations for choosing a pump depending on performance can be found in special sources.

Maximum head

The maximum head generated by the pump. This parameter is most often indicated in meters, by the height of the water column that the unit can create — in other words, by the height to which it can supply water. You can estimate the pressure created by the pump using a simple formula: every 10 m of head corresponds to a pressure of 1 bar.

It is worth choosing a pump according to this parameter, taking into account the height to which it should supply water, as well as adjusting for losses and the need for pressure in the water supply. To do this, it is necessary to determine the difference in height between the water level and the highest point of water intake, add another 10 to 30 m to this figure (depending on the pressure that needs to be obtained in the water supply), and multiply the result by 1.1 — this will be the minimum pressure required.

Dry run protection

A system that protects the unit from running without water.

The dry running mode is abnormal for any pump: at best, the mechanism of the unit in this mode experiences increased loads, and at worst, the device may fail and even a serious accident. This feature allows you to prevent such consequences. The specific method of protection against dry running may be different; one of the most popular options is a float switch (see below). However, in addition, flow sensors, pressure or level switches can be used. These details depend both on the general type of pump and on the specific model; they should be specified separately in each case.

Maximum power

Rated power of the pump motor. The more powerful the engine, the higher the performance of the unit, usually, the greater the pressure, suction height, etc. Of course, these parameters largely depend on other features (primarily the pump type, see above); but models similar in design can be compared in terms of power.

Note that high power, usually, increases the size, weight and cost of the pump, and also implies high costs of electricity or fuel (see "Power source"). Therefore, it is worth choosing a pump according to this parameter taking into account the specific situation; more detailed recommendations can be found in special sources.
Wilo Jet WJ 202 often compared