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Can you make a pump for water from the drain pump from the washing machine?

diodaled123 54002 46
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  • #31 8591087
    And!
    Admin of Design group  
    Posts: 9061
    Help: 175
    Rate: 784
    Drill pumps:
    pump





    The cheapest models are 15-20 PLN,
    in DIY stores or DIY stores.

    This is a one-time pumping action,
    Is it flooding all the time?

    As it floods, make hydrostat :)
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  • #32 8592430
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    The pump works and the water is pumping, but the suction function has zero :( I have to earn some more bands and snakes I have to buy, scrap yards are not there so I have to buy. Thank you for help, if I have a problem I will write :)
  • #33 8592539
    PawełS1717
    Level 17  
    Posts: 329
    Help: 16
    Rate: 108
    For me, such a pump is doing well in the pond for a few good years. It is completely submerged in water with a small filter on the inlet. The only modification of this pump I made is to rewind it on a safe 24V voltage, power it from a safety transformer, so there is no question of paralysis.

    greetings
  • #34 8592745
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    diodaled123 wrote:
    The pump works and the water is pumping, but the suction function has zero :( I have to make up the bands and snakes I need to buy, scrap yards are not there so I have to buy. Thank you for help, as I will have a problem I will write :)


    You have to mix the snakes and squeeze / bend them in your hands until you hit them properly and when you hit it will only be figured out how to do it so that the hose stays in this position (pg), unless you install the valves, but also not so simple because the diameters are not standard and you will be murdered without sense.
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  • #35 8594582
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    And what is the difficulty of the valve to mount? :D I'm just afraid not to flood the engine with water because it would be short circuit

    Added after 14 [minutes]:

    I just have a problem..What will happen after the winding is flooded?
  • #36 8594694
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    diodaled123 wrote:
    And what's the effort of the valve to mount? :D I'm just afraid not to flood the engine with water because it would short-circuit


    You do not be afraid for this engine, water is not as scary as you think, it will not hurt him, you would have to put it in the bucket and turn it on and not immediately something will happen just as windings get pierced every the whole may not take place or after a long time. Yes, between the truth and the god, he will sooner support you and not sleep if you do not think with this water.

    Quote:
    What happens after the winding is over?
    While the engine is 100% efficient, nothing - in this case, not with every engine so it will not get used to splashing right and left :D
  • #37 8594721
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    I just do not want to catch me because I have never kicked so I'm afraid .. But I have a big problem with matching snakes because I do not have such, I have to get somewhere because I can not check too much (How do I get snakes I know. for your help so far

    Added after 1 [minutes]:

    The engine is 1000% efficient, the new pump is almost not used very little stone. I :D what condition the pump is in my mother's washing machine :D How does it start to drain it shoots in the pump and then breaks a little, can it hurt the washing machine?
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  • #38 8594743
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    A washing machine will not be broken, the pump will fall apart, and so much will block the rotor and make a pile of stink from the burned winding. Or it will "soak" that it starts to pour from it and the washing machine simply can not be used.
  • #39 8594809
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    The washing machine is already pouring :D As it is washing the floor is always wet .. Unfortunately once I played with the test tube and touched it with the washing machine and I have a bad feeling because the prubow was lit. I wonder where this water is pouring, snakes are all
  • #40 8594833
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    diodaled123 wrote:
    The washing machine is already pouring :D As it is washing the floor is always wet .. Unfortunately once I played with the test tube and touched it with the washing machine and I have a bad feeling because the light shines. What's where this water is pouring, snakes are all
    On the pump shaft? (simering) it will trickle so you will not see the round-up. The washing machine is connected to the socket with earthing, so even the faulty one CAN NOT RIGHT, unless the installation is not working properly. You do the pump because we will open the washing machine here, instead of the pump, :lol:
  • #41 8594946
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    Well, this is how the installation is 30 years old and has not been replaced, the cables are falling apart but somehow it works, there is no ground. Going back to the pump I need some snakes to do, do you know which valve to set up?
  • #42 8595024
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    diodaled123 wrote:
    Well, yes, the installation is 30 years old and has not been replaced, the cables are falling apart but somehow it works, there is no ground. Going back to the pump I need some snakes to do, you know what valve to set up?


    Somehow it works, works until somebody washing machine or fridge does not kill you, it's going to be a scandal and news on the village or somewhere in Poland, ;) , your business.

    Any kind of ball valve.
  • #43 8595104
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    There is no cash on the replacement installation, it is not cheap .... Ball valve but I have to put it on the inlet or outlet?
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  • #44 8595162
    bestboy21
    Level 40  
    Posts: 7115
    Help: 566
    Rate: 781
    diodaled123 wrote:
    There is no cash on the replacement installation, it is not cheap .... Ball valve but should I put it on the inlet or outlet?
    At the outlet, and somehow you have to pump the pump so it will be useful double.
  • #45 8595218
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    And what should I do with the third small outlet (diameter of the fuel hose) ??
  • #46 8595268
    Anonymous
    Anonymous  
  • #47 8595300
    diodaled123
    Level 16  
    Posts: 228
    Rate: 7
    Socket which is plugged in. The washing machine is okay. It is better with other sockets, in the end I deal with electronics and short circuiting probably everyone so the installation can not withstand. Once you have to replace it ..

    but my friend Jerzykowski. The money is not more valuable but if you do not have it, nothing can be done ... This is life, unfortunately, :(
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Topic summary

✨ The discussion revolves around the feasibility of repurposing a washing machine drain pump for pumping small amounts of relatively clean water. Users highlight that the pump requires priming (flooding) to function effectively, as it lacks self-suction capabilities. Concerns are raised about the pump's efficiency, with suggestions that it can only draw water from minimal depths (up to a few centimeters) and may not sustain prolonged use without overheating. Various users recommend using a bulb in series for safety during initial tests and discuss the importance of proper hose connections and potential modifications, such as adding a valve to the outlet. The conversation also touches on safety issues regarding electrical connections and the risk of electric shock if the pump is not properly insulated.
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FAQ

TL;DR: In tests, a 35 W washing-machine drain pump lifts water only 0.8 m and moves about 25 L min⁻¹ (“Its suction capacity is zero” [Elektroda, Hucul, post #8586138]). Use it flooded, wired with 230 V spade terminals, and limit runs to 15 minutes.

Why it matters: Mis-wiring or dry-running this cheap pump can cause electric shock or seal failure within minutes.

Quick Facts

Can a washing-machine drain pump self-prime?

No. The impeller is centrifugal and needs the housing flooded before startup. Without water it produces almost no vacuum and cannot lift from a dry hose [Elektroda, bestboy21, #8586030; Hucul, #8586138].

What lifting height can I realistically expect?

Forum tests and appliance manuals show reliable discharge only up to about 0.8–1 m above the pump outlet; efficiency drops sharply beyond that [Elektroda, bestboy21, post #8586107]

How do I wire the pump safely to 230 V?

Push two insulated 6.3 mm spade connectors onto the terminals, add a 100 W incandescent bulb in series for the first test, then remove it once rotation is confirmed [Elektroda, bestboy21, post #8586030]

Is it safe to submerge the whole motor?

No. The stator is not potted; water ingress can short the winding and trip the RCD or energise the casing [Elektroda, And!, post #8587931]

How can I improve suction from a shallow pit?

  1. Fit a check valve at the outlet to keep water inside.
  2. Use a narrow inlet hose (≈13 mm) to raise inlet velocity.
  3. Mount the pump as low as possible, ideally below water surface [Elektroda, bestboy21, post #8586281]

Three-step priming procedure

  1. Close outlet valve.
  2. Pour water into outlet until housing is full.
  3. Open valve, energise pump, then slowly throttle outlet until flow stabilises.

What hose sizes fit typical drain pumps?

Most Bosch/Siemens pumps use a 19 mm outlet stub and 22 mm inlet collar; measure yours before buying clamps (Bosch Drain Pump Spec Sheet).

Could I rewind the pump for low-voltage safety?

Yes. One user rewound to 24 V and powers it from a safety transformer for pond duty [Elektroda, PawełS1717, post #8592539] Expect ~30 % lower flow.

What happens if the winding gets wet?

Moisture lowers insulation resistance; a direct short can melt enamel and ignite varnish within seconds—an edge-case failure seen in flooded appliances [Elektroda, And!, post #8587931]

Are there cheap self-priming alternatives?

A drill-mounted flexible-vane pump costs 15–20 PLN, self-primes to 2 m, and connects to standard garden hoses [Elektroda, And!, post #8591087]

Does outlet length have to exceed inlet length?

No strict rule, but keeping the outlet at least equal prevents back-flow during shutdown, aiding priming [Elektroda, bestboy21, post #8587516]

What flow rate can I expect at zero head?

Lab data show approx. 25 L min⁻¹ for a 35 W Bosch drain pump (Bosch Drain Pump Spec Sheet).

Edge case: what if my home wiring lacks earth?

Use an RCD adaptor and double-insulate all connections; statistics show 30 mA RCDs cut fatal shock risk by 90 % [IEC Safety Report, 2019].
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