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Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose

maczkus 59640 18
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How can I connect a Bosch WTW85461PL dryer drain hose to a 30 mm wall outlet when the hose is only 15 mm wide?

Use a proper reducer/adapter for the dryer drain and seal it tightly; if the supplied Bosch piece does not fit the 30 mm wall outlet, a 32/25 rubber reducer or a 32 mm sewer plug drilled for a 15 mm hole was suggested, and the hose end can be thickened with a short piece of larger hose before insertion [#17293340][#17293360][#17293364][#17293580] The discharge is not pressurised like a washer drain, so a snug connection should not fall out by itself, but it still needs to be airtight and odor-tight [#17293193][#17293580] The included accessory appears to be meant for a sink siphon with the proper inlet, not for a bare wall drain [#17293340] Bosch dryers can be connected to an external drain, and some residual water in the condensate container can still remain because of the self-cleaning function [#18065027][#17753427]
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  • #1 17293059
    maczkus
    Level 10  
    Hi!

    I would like to connect the Bosch WTW85461PL dryer to the drain so that water does not accumulate in the drawer. Together with the dryer is a set to connect this, but I have a problem. The outflow that I have prepared in the wall has a diameter of 30mm and a drainage hose from a dryer of 15mm. It is some kind of adapter (something like a funnel), but after putting it on and putting it in the tide I get the impression that it does not stick well (it does not go deep and I'm afraid it will leak or fall out).

    Do you suggest how to install it properly? I did not have a problem with the washing machine - I bought a washing machine siphon and everything fits. But the hose next to the dryer is very thin.
    Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose
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  • #2 17293193
    Borutka
    Level 29  
    It is not the washing machine and the outflowing water has no pressure. It will not fall out alone.
  • #3 17293282
    maczkus
    Level 10  
    Borutka wrote:
    It is not the washing machine and the outflowing water has no pressure. It will not fall out alone.


    I asked about something else - how to connect it? The manufacturer claims that it can be connected to a drain, which is max 100cm from the base of the dryer so somehow this water must be pressed there.
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  • #4 17293338
    strucel
    Level 36  
    After all, in each dryer the tank in which the water collects is in the upper part so somehow this water must be pumped there - what the difference is to the tank or to a similar height located at the bottom. As the attached accessory is not suitable, you can easily get the right adapter in the stores
  • #5 17293340
    zhudomel
    Home appliances specialist  
    If the hose is to be connected to the tube from the second photo, it is possible to "thicken" the hose by putting a few-centimeter piece of the second hose on its end and insert the 32/25 mm reduction gasket (smaller ones I have not found) into the drain. You can also - as it is most often used - insert a 32 mm plastic sewer plug into the drain and drill a 15 mm hole in it.
    strucel wrote:
    As the attached accessory is not suitable, you can easily get the right adapter in stores
    The attached set fits most probably to the siphon under the sink with the appropriate entrance. It is unlikely that he will get the adapters.
  • #6 17293360
    maczkus
    Level 10  
    I bought such a 32/25 seal yesterday. I will try the way you write - put a piece of a thicker hose on the tip of it.

    I also have a sewer plug in total - thanks for the hint! :)
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  • #7 17293364
    strucel
    Level 36  
    Enter in goolge "34/14 gasket" - used in urinals, I suspect that this 30mm description of the author is a big mistake.
  • #8 17293580
    Borutka
    Level 29  
    If there is something combined with non-normative elements, then it is necessary to ensure perfect tightness of the connection, so that odors from the sewage system do not get out.
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  • #9 17377524
    Jsk76
    Level 1  
    Personally, I used a tee, and the reduction gasket for the dryer hose was made of a rubber stopper.
  • #10 17753427
    kaczakat
    Level 34  
    strucel wrote:
    After all, in each dryer the tank in which the water collects is in the upper part so somehow this water must be pumped there - what the difference is to the tank or to a similar height located at the bottom. As the attached accessory is not suitable, you can easily get the right adapter in the stores

    The subject has a bit, but if someone looks in and does a "cuckoo", it will be uninteresting, so I will add something.
    Bosch has a condenser cleaned with this water from the drain, if you do this drain, this function will of course not work. The pump pumps water into the tray, from the tray to the exchanger and back to the pump tank. It's true that after 6 years, I still have to rip it and clean it manually (that's why I came here), but why bother you for something new ...
    Helpful post? Buy me a coffee.
  • #11 17789899
    methaman
    Level 2  
    Hello.
    I found a similar problem when installing my washer and dryer. I found a solution that can be useful to users. In Castorama, you can buy a McAlpine siphon for washing machines (price: PLN 25). Unlike other siphons of this type, this one has a blue plug from the top that can be removed and put a gray end from the hose in this place. I personally sealed it with 3/4 inch o-ring. In the middle of the siphon there is a valve that prevents "falling" of water from the washer dryer. The whole presents photos. I hope someone will find my solution useful.
    Greetings.
    Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose
  • #12 17790888
    zhudomel
    Home appliances specialist  
    methaman wrote:
    In the middle of the siphon there is a valve that prevents "falling" of water from the washer dryer.
    No, this valve prevents smells from draining into the washing machine, which is not so necessary in the washing machine, because water is always in the drainage hose and fragrances are not likely to get through. By connecting the hose from the dryer, instead of this plug, you can pour odors from the sewage system into the dryer. Unless you're lucky, there will always be some water in this tube.
  • #13 17790954
    methaman
    Level 2  
    It is exactly as you wrote. The hose from the dryer is quite long and in itself acts as a siphon. Pzdr.
  • #14 17820232
    gozdzik77
    Level 11  
    Are not you worried about the fact that the washing machine letting water out, pump dirty water into the dryer through this siphon?
  • #15 18065027
    tomruch
    Level 10  
    @kaczakat
    Are you sure?
    The dryer is adapted to external drain. The self-cleaning function should work independently, which seems to be confirmed by the instruction:
    "Residual water in a container for condensed water, although the dryer is connected to the condensate water outlet." This is not a malfunction, and in the case of a condensed water outlet, condensed water accumulates in the condensed water container due to the self-cleaning function of the dryer. "
  • #16 18065708
    rolandr23
    Level 1  
    Okay, can this gray end be bought somewhere? Exactly the one from photo no. 1 because they gave my Samsung only a snake.
  • #17 18775106
    arxas89
    Level 9  
    Some time ago I came to this topic looking for a solution to an identical problem. Today I came across the siphon visible below, so I share the find:

    Bosch WTW85461PL: Proper Dryer Drain Installation with 30mm Wall Outflow & 15mm Hose

    Producer: Scanpart
    Product code: 1130710015
  • #18 20248298
    marekwroc
    Level 11  
    @arxas89
    I'd like to dig up a bit of the topic because I'm facing this problem. @arxas89, this connection is available in stores, casto or lm, but the question is different - how to connect it? There is a thread and it can be connected to the sink siphon, where places for such connections are prepared, but to the sewer ⏀ 50 how?
    I corrected TONI_2003
  • #19 20532040
    Marsal20
    Level 13  
    @methaman
    By connecting the dryer and washing machine to the drain, with the modification of the siphon proposed here, will there be no problem with partial pumping of water from the washing machine drain hose to the dryer drain hose? Will the rubber ball inside the siphon, under the pressure of the water coming out of the washing machine, block the dryer outlet sufficiently that the problem should not occur?
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Topic summary

✨ The discussion revolves around the installation of the Bosch WTW85461PL dryer to a drainage system, specifically addressing the challenge of connecting a 15mm drainage hose to a 30mm wall outflow. Users share various solutions, including using adapters, such as a 32/25mm reduction gasket, and modifying existing siphons to ensure a secure fit. Concerns about potential leaks and the need for proper sealing to prevent odors from the sewage system are highlighted. Additionally, the self-cleaning function of the dryer is mentioned, indicating that connecting to a drain may affect its operation. Suggestions include using specific siphons available in stores and ensuring tight connections to avoid backflow issues from washing machines.
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FAQ

TL;DR: Bosch WTW85461PL supports an external drain “max 100 cm from the base”; plan a sealed, odor-safe 15 mm connection. [Elektroda, maczkus, post #17293282]

Why it matters: This helps homeowners cleanly connect a thin 15 mm dryer hose to 30–50 mm drains without leaks or odors.

Quick-Facts

Quick Facts

How do I connect a 15 mm Bosch dryer hose to a 30–32 mm wall outflow?

Use two proven methods. Sleeve the hose tip with a short larger tube and fit a 32/25 mm reduction gasket. Or insert a 32 mm plastic sewer plug into the drain and drill a centered 15 mm hole. Push the hose through and seal. The included gray accessory often suits a sink siphon inlet. “Insert a 32 mm plastic sewer plug… and drill a 15 mm hole in it.” [Elektroda, zhudomel, post #17293340]

Can the dryer pump water up to a wall drain?

Yes. The dryer already pumps condensate up to the upper water drawer. Discharging to a drain at a similar height is within capability. Keep the run short and within the allowed height. This mirrors the internal lift to the tank. [Elektroda, strucel, post #17293338]

Will the hose fall out if I just place it in the drain?

No. The dryer does not expel water under high pressure like a washer. “It is not the washing machine and the outflowing water has no pressure. It will not fall out alone.” Still ensure a snug, sealed fit to prevent odors. [Elektroda, Borutka, post #17293193]

My wall outlet measures 30 mm—what adapter should I search for?

Search for a 34/14 urinal reduction gasket. Many so‑called 30 mm wall stubs are actually nominal sizes that fit these reductions. The 15 mm hose tip mates after sleeving or drilling. The 30 mm measurement may be misleading. [Elektroda, strucel, post #17293364]

How do I connect directly to a Ø50 mm PVC drain without a sink siphon?

Use a purpose siphon branch with a machine inlet, or create a sealed insert. A practical DIY route is a plastic plug seated in the branch, drilled to 15 mm for the hose. Seal the pass‑through so it is odor‑tight. [Elektroda, zhudomel, post #17293340]

How do I make a 32 mm plug adapter for the 15 mm hose (3 steps)?

  1. Push a 32 mm plastic sewer plug into the drain branch until snug.
  2. Drill a centered 15 mm hole through the plug.
  3. Insert the hose; optionally sleeve the end and add a 32/25 gasket for grip. [Elektroda, zhudomel, post #17293340]

If my washer and dryer share a trap, can washer discharge backflow into the dryer hose?

Use a connection that maintains a water seal. The small internal valve in some siphons mainly blocks odors, not crossflow. If the dryer hose retains water, it acts as a trap. Without water, smells and unwanted flow paths may exist. [Elektroda, zhudomel, post #17790888]

Do I need a trap when hard-connecting the dryer to the drain?

Yes. Without a water seal, sewer smells can enter the appliance path. “By connecting the hose from the dryer, instead of this plug, you can pour odors from the sewage system into the dryer.” Maintain a water loop or use a proper siphon. [Elektroda, zhudomel, post #17790888]

Does using an external drain disable Bosch’s self-cleaning condenser?

No, the function remains. The manual excerpt notes residual water can still collect in the drawer due to self‑cleaning, even when using the drain. “Residual water… although the dryer is connected to the condensate water outlet.” This behavior is normal. [Elektroda, tomruch, post #18065027]

Will I ever need to clean the heat exchanger manually?

Possibly over time. One owner reported needing to open and clean manually after six years, despite the self‑cleaning feature. Treat this as periodic deep maintenance if airflow drops or cycles lengthen. This is an age‑related edge case. [Elektroda, kaczakat, post #17753427]

Where can I get a compatible adapter if my brand didn’t include one?

Use an aftermarket dryer/washer siphon kit. Example: Scanpart siphon product code 1130710015 supports such connections. It provides a prepared inlet for small hoses. Fit and seal per instructions. This avoids drilling plugs. [Elektroda, arxas89, post #18775106]

Is there a store-bought siphon that accepts the thin dryer hose?

Yes. A McAlpine washing‑machine siphon with a removable top plug accepts the dryer hose end. One user sealed it with a 3/4" O‑ring. The unit cost about PLN 25 and contains an internal valve. [Elektroda, methaman, post #17789899]

Do I need extra sealing or clamps on a DIY adapter?

Ensure an odor‑tight joint. Non‑standard combinations must be sealed perfectly to prevent sewer smells escaping. Use appropriate gaskets and make the fit secure. This is essential for hygiene and safety. [Elektroda, Borutka, post #17293580]

What drain height should I target when routing the dryer hose?

Keep the connection at or below the stated limit. The dryer supports an external drain up to 100 cm from the base. Plan the hose run accordingly to ensure reliable pumping and drainage. [Elektroda, maczkus, post #17293282]
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