The clue "Lab heater of old" last appeared in the Universal crossword on March 3, 2016. The correct answer for this puzzle is "ETNA", a 4-letter word.
Solution ETNA is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is ETNA with 4 letters, and the shortest is ETNA with 4 letters.
No, "LAB HEATER OF OLD" hasn´t seen a spike right now. Solvers are most interested in: Composition, Keep, Celebrated, Vault and Rock band's helper.
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The solution is 4 letters long.