What is the answer to "Part of a quirky heating system?" in the WSJ Crossword?

The answer to the WSJ Crossword clue "Part of a quirky heating system?" is DAFFYDUCT (9 letters).

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Part of a quirky heating system? WSJ Crossword Clue

Across clue · from the October 6, 2026 puzzle

Stuck on “Part of a quirky heating system?” from the Wall Street Journal Crossword? Here is the verified answer:

Answer

DAFFYDUCT

9 letters · Across · last seen October 6, 2026

1AVolunteer sitters, sometimes5 1DRudimentary principles4 2DRiver to the Caspian Sea4 3DCruel emperor4 4DBar feature3 5DMock without mercy6 6DBecome prevalent5 6AScrape souvenir4 7DWinter Palace occupant4 8DPendulum path3 9DCertain Wayne Manor exit7 10ADo seen in Wakanda4