Short answer: on a Miele heat pump dryer under roughly ten years old, repairing the heat pump assembly is usually the right move. These machines cost a lot to replace and very little to run, which tilts the 50% rule toward keeping them going.
A Miele heat pump dryer is a different animal from a vented dryer, and that difference drives the repair decision. Here is the age-and-cost picture, why the technology favors repair, and the upkeep that keeps a heat pump healthy.
Heat pump verdict by dryer age#
Find your dryer's age, then the column matching the quote against a new Miele. The bands are the 50% rule laid out by age.
| Dryer age | Under 25% of new | 25 to 50% | Over 50% |
|---|---|---|---|
| Under 3 years | Repair | Repair | Repair |
| 3 to 5 years | Repair | Repair | Repair |
| 5 to 8 years | Repair | Repair | Weigh it |
| 8 to 12 years | Repair | Weigh it | Replace |
| Over 12 years | Weigh it | Replace | Replace |
Put plainly: keep the heat pump repair while the quote stays under 25% of a new Miele, weigh it in the 25 to 50% band, and replace only once the number tops 50% on an older machine.
Why the technology favors repair#
A Miele heat pump dryer recycles hot air through a closed loop instead of an internal heating element, and the T1 series built around that design uses roughly 60% less energy than a conventional dryer. That efficiency is the whole point of buying one, so replacing a machine outright to avoid a heat pump repair usually throws away exactly the running-cost advantage you paid for. Because these dryers cost more up front and save so much to operate, the math leans toward restoring the heat pump rather than starting over — assuming the age still supports it.
The ventless advantage worth protecting#
Heat pump dryers do not need an external vent, which is what makes them workable in apartments and condos where a traditional dryer cannot go. If your Miele is serving a space that has no vent line, that alone raises the cost of switching away from it — a replacement may mean the same premium technology anyway. Keeping the existing machine running preserves both the efficiency and the installation flexibility that led you to it in the first place.
Maintenance that keeps the heat pump alive#
The most common cause of weak performance is not failure but neglect. Lint builds up on the heat exchanger and chokes the airflow, so Miele's guidance is to clean the exchanger fins every six to twelve months. A dryer that has grown slow or runs hot may only need that cleaning, not a new assembly, so have it checked before you approve any part. Skipping the cleaning is also what shortens a heat pump's life, so treat it as routine rather than optional.
Before you approve the part#
Confirm the heat pump is truly the fault first, since a sensor, thermostat, or blocked exchanger can mimic it for far less money. Genuine Miele parts run 10 to 30% above generic equivalents, but on a sealed heat-pump system the correct part matters. Get the diagnosis verified and a second quote if the first feels steep, and factor in the friction of replacement: delivery, haul-away, and setup for a new machine.
When replacement does make sense#
None of this means a heat pump dryer is worth saving at any cost. On a machine past a dozen years, or when the sealed heat-pump circuit itself has failed rather than a sensor or fan, the quote can climb into replace territory even for a Miele. In that case a new heat pump model keeps the efficiency and the ventless install while resetting the clock. The line to watch is the same 50% rule — it is just that a Miele's low running cost and long design life push that line further out than a budget dryer's would.
Not sure the heat pump is really gone? A professional diagnosis separates a clogged exchanger from a failed assembly and prices the exact part for your model.
Appliance Repair Technician · 8 years experience
Experienced technician with 8 years specializing in dishwasher repairs and European appliance brands including Bosch and Thermador.
