The best replacement for kiln is furnace.

The best alternatives to kiln are rated as following:
★★★★★  furnace
★★★  air dried
★★★  kiln
★★★  oast
★★★  ceramic kiln
★★★  bitbucket
★★  glass kiln
★★  forge
★★  air dried wood
★★  electric kiln
★  air dried lumber
★  tortoisehg
★  gas kiln
  pottery kiln

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Speaking about kiln, one probably shouldn't forget about lumber.

Other search terms related to kiln and their ratings are:
★★★★★ lumber
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kiln
furnace
air dried