- A clever mechanism
- An adapted flow
- Installation of a lifting pump
- Automatic triggering of the pump
- In the field
- Complete emptying
- Criteria for choosing a lifting pump
- Good to know: pump hoses
- Test procedure
- Pumping efficiency
- What to remember from the test?
- The favorite of System D: Einhell
- Comparative tables of 6 lifting pumps
Whether it is to clean a cellar, maintain a swimming pool or a pleasure pool, the lift pump is the ideal tool. To choose it, one must take into account the actual use that one wants to make of it.
Installed permanently at the bottom of a glance for the sanitation of the buried parts of the houses or punctually used to empty a pond or to pump a sub-soil invaded by the waters, the pumps dedicated to the suction of the loaded water are conceived differently from classic pumps.
A clever mechanism
Inside, a finned disc rotates very quickly to create a vacuum and suck the water. Under the effect of kinetic energy, the water is pressed against the wall of the pump body before being discharged through the outlet orifice. This design allows the passage of particles in suspension while generating very little friction.
If it is the diameter of the inlet that prevents the passage of thicker particles, it is still preferable to use a prefilter called strainer. Some models are equipped with them automatically (Gardena, Einhell and Kärcher).
However, it should be noted that if manufacturers announce a maximum diameter of absorbed particles, they are in fact milky substances, soft bodies, poorly diluted sludge or decomposing vegetable waste... in no case pebbles or blocks solid.
An adapted flow
Important criterion of choice, the flow of the machines is related to the nominal power of the motor. But it must be known that the friction of the water constitutes one of the main losses of flow. To fight against this, it is enough to use a large diameter pipe and to reduce as much as possible its length.
In addition, a clean, new pipe with a smooth inner surface generates less friction.
The lifting height is also to be taken into account. The more important it is and the more the rise of fluids is slow.
The most powerful pump shown here can not exceed a lift greater than 7.5 m. The key in choosing a pump is to accurately assess its needs and compare the performance of each reference.
Installation of a lifting pump
For the evacuation of water, a 1.5 '' connection screw on the pump (except on the Kärcher which requires a 1 "connection).
The reducer fitting allows to fix a connection to screw or to fit.
To guarantee the best performance, they are designed to be cut to the diameter of the pipe used
Stainless steel collar correctly holds the hose on the pump (hose and accessory not supplied).
To immerse the pump, a simple rope attached to the handle is enough.
A notch or fixation on the pump body or on the handle (Kärcher) allows to position and maintain the float.
On one of the machines (Einhell), a setting changes the height of the base to obtain a complete pumping without residual water.
Automatic triggering of the pump
Most pumps are equipped with an automatic trigger type "ball float".
The machines can also be used in forced operation via the switch or holding the float vertically, depending on the model.
Gardena uses a sensor trigger system and offers a setting of the priming water height and pumping stop.
The Ribiland has an integrated float, convenient in small spaces.
In the field
The Gardena and Ribiland are the only ones not to use an external float trigger, which avoids the risk of blockage in narrow glances.
All pumps have a screw connection for quick attachment to a garden hose with an automatic connection.
It can happen that debris blocks the suction of the pump. It is possible to clean the strainer with a stream of clear water.
If the problem persists, it is then necessary to disassemble the housing (after having disconnected the pump) to reach the turbine.
To drain a pool, spa or pool, two things are important to check.
The first criterion is the residual water depth.
The second is the ability to function in the presence of foreign bodies, such as dead leaves.
On the Einhell, a setting changes the height of the strainer.
Criteria for choosing a lifting pump
- We distinguish two main types of use for these lifting devices: sanitation and emptying. Makita, Silverline or Ribiland pumps are clearly designed for the first use (sump, drain, decompression well...), while the Gardena is more efficient for the second one. The Einhell, meanwhile, plays on versatility.
- The protection of areas subject to high water levels must be ensured by very high flow pumps (Einhell) connected to large diameter pipes in order to limit pressure losses.
- The storage of the material is an important point. If the overall size of the pumps is approximately the same, accessories such as the cable winding handle (Einhell) or the attachment scratch (Kärcher) are little more.
- The cost factor is important: in case of infrequent use, it is better to favor cheap pumps like the Ribiland.
Good to know: pump hoses
The diameter of the pipe has a great influence on the pumping rate. When the flow is important, make sure to use a pipe of the largest possible diameter and especially avoid reducers (type quick hose coupling).
- The power and the flow put forward the capacities of the pumps to raise and evacuate large quantities of water in a minimum of time. This is a key point when the pump is used as protection against the rapid rise of water (for example in a cellar) or in the case of pumping very large volumes (pool, pond...).
- Automatic activation is essential in the case of use in building protection (fight against rising water or for a drainage system). In many cases, pumps must operate in tight spaces (eyes, sump, narrow nozzle), hence the importance of taking into account the travel of the trigger system.
- Ergonomics and comfort of use are important in the case of frequent use. This can be the ease of commissioning, the convenience of storage or the sound level of the pump.
- The ability to perform complete emptying in forced operation is useful for draining tanks (pool, pool, spa...) when changing water or cleaning equipment. We then appreciate the level of tolerance of the pump facing the presence of large waste and the remaining water level.
The pumps were tested in a 100-liter bucket of water containing decaying plant debris.
To test the machines as much as possible, a small diameter (25 mm) and long (25 m) pipe was attached using a quick hose coupling.
The elevation drop was 1.5 m. To test the reboot of the pumps, the power supply was turned off several times.
The end of the pumping was carried out in forced march in order to check the capacity of the pumps to absorb or tolerate the plant debris and to measure the height of the residual water.
The bin was then progressively filled to evaluate the minimum automatic trip height and cutoff height.
What to remember from the test?
Our test confronted the machines with complete emptying: this operation has defeated the pumps only developed for sanitation.
- Versatile, the Einhell comes first. It combines performance, ergonomics, ease of use and knows how to adapt to all situations.
- In second place, the Ribiland is a neat machine that makes the difference with its integrated ball and low price.
- The Gardena, third, loses points because of its price and the lack of power of its engine.
- In fourth place, the Kärcher gets very consistent notes despite design weaknesses.
- The Silverline Then Makita, close "cousins", come to finish the classification with benefits rather disappointing.
The favorite of System D: Einhell
We chose the first test for a simple reason: it's one of the cheapest and the most versatile. In the field of sanitation, its record flow coupled with an exemplary priming make it an important ally in the fight against floods.
In addition, the adjustable float attachment optimizes the free cable length, making it a little more compact than other pumps using this type of contactor.
The clever height adjustment of the base allows you to pump the water to the last drop, a serious advantage as soon as you are confronted with complete emptying. We also appreciate its well-designed handle for winding the power cable.
Comparative tables of 6 lifting pumps
Comparison of six lift pumps (table in pdf: click to enlarge)