Rules:
-Normal sudoku rules apply.
-Digits along a thermo must increase from the bulb end.
Links:
F-Puzzles
CTC
Solution code: Row 5 followed by Column 9, with no spaces.
Solved by StefanSch, SKORP17, Qodec, NeroChaos, Playmaker6174, apendleton, arteful, OGRussHood, PippoForte, Felis_Timon, lerroyy