How to Replace a Bosch Dryer

Bosch dryers come in three flavours and the install differs for each. Vented WTE units exhaust through a hose to a wall vent. Condenser WTG units run ventless. Heat pump WTW units — the current mainstream — are also ventless, sip power at 120V thanks to heat-pump efficiency, and are the fussiest to move. Their compact 24-inch European width means door clearance and service access are tight, so positioning is worth getting right the first time.

Before you begin#

Safety warning: Unplug the old dryer before disconnecting. If it is a gas dryer (rare for Bosch in the US, but exists), shut off the gas valve and have a professional disconnect the gas line. Never move a heat pump dryer on its side — compressor oil migration.

Step-by-step#

1. Confirm the type you have and the one going in#

Vented WTE runs on 240V or 120V through an exhaust hose; condenser WTG is ventless on 240V; heat pump WTW is ventless on 120V and drains its condensate. Knowing both the old and new type tells you whether you are dealing with ducting, a drain, or just a power cord.

2. Remove the old dryer#

Unplug it. On a vented unit, loosen the vent clamp at the rear and pull the hose off; on a condenser or heat pump, disconnect the condensate drain line at its push-fit or clamped outlet. Heat pump models keep water in a removable tank in the upper-left of the cabinet — pull it out and empty it before you move anything. Bosch dryers run a light 120-150 lbs, so one person can dolly one, though two make doorways easier. Keep it upright. If it sits stacked on a washer, free the stacking kit (four bolts on most kits, Torx T20 or Phillips) and slide the dryer forward off the brackets.

3. Ready the space and the services#

With the old unit gone, check the outlet: heat pump WTW dryers want a standard 120V/15A supply, while vented models use 240V/30A. Switching from vented to heat pump may mean an electrician adds a 120V outlet. For a condenser or heat pump you can drain continuously instead of emptying the tank, but the drain is gravity-fed, so the drain point must sit below the dryer's outlet. If you are fitting a vented unit, run a brush through the existing duct to clear lint and check the exterior flap.

4. Unpack the new dryer#

Strip the outer packaging, open the door, and clear the internal foam blocks, tape, and sensor protectors. Find the drain hose, any stacking hardware, and the manual. Unlike washers, Bosch dryers have no transport bolts — the drum rides on its belt and bearings — so there is nothing to unbolt.

5. Fit the stacking kit if stacking#

Stacking on a Bosch washer needs the matching kit (WTZ11400 for compact units, WTZ20410 for some pairings). Take off the washer top panel (two Torx T20 at the rear, slide back), hook the bracket into the rear wall and screw it to the side walls at four points, slide the dryer's feet into the bracket rails from the front, and lock it down with the supplied screws. Most kits also add a pull-out loading shelf.

6. Connect the condensate drain (condenser and heat pump)#

You have two choices. The removable tank slides into the upper-left of the cabinet and is emptied after each cycle when the machine flags Empty Container. For a permanent drain, push the supplied hose onto the rear outlet and route it to a sink, standpipe, or floor drain on a continuous downward slope with no uphill sections — 4 feet is the limit without a drain-pump accessory.

7. Connect the exhaust (vented only)#

Clamp or foil-tape the vent hose to the rear port; never drive screws through the duct because they snag lint. Keep bends to a minimum — each 90-degree turn costs about 5 feet of effective length, and Bosch caps the total equivalent run at 35 feet. Use rigid or semi-rigid metal duct, never plastic or vinyl, which is a fire hazard.

8. Level it#

Set a spirit level on top and adjust all four feet. A true-level heat pump dryer drains its condensate properly; an unlevel one pools water on one side and throws false full-tank warnings.

9. First run and sensor calibration#

Power up and answer any first-boot prompts. Run a 30-minute timed cycle with two or three damp towels to prove the heat works and let the moisture sensors baseline against real fabric. On heat pump models the compressor needs a couple of minutes to build pressure, so the first cycle warms up gradually. Expect the next three to five AutoDry cycles to fine-tune themselves as the system learns your loads.

Troubleshooting the install#

• Empty Container warning with an empty tank: shipping film on the tank sensor or a tank that is not fully seated. Wipe the contact rails and reseat firmly.
• No heat on the first heat pump cycle: normal — the compressor is still building pressure.
• Drain overflows at the connection: the gravity hose runs uphill somewhere. Re-route it with a consistent downslope.

When to call a professional#

EasyBear technicians serving Sacramento and the Bay Area carry Bosch-specific diagnostic tools and replacement parts on every service call. Bring one in for gas-line work, for changing an outlet between 240V and 120V, for complex vent runs through walls or ceilings, or for stacking above 6 feet where a fall is a real risk.

Need Professional Help?#

• Dryer installation service
• Bosch appliance repair
• Dryer installation cost guide

Need help with this repair? Schedule a free diagnostic — our technicians handle Bosch dryer repairs same-day.