Thermo Sudoku Snack

Normal irregular 8x8 Sudoku rules apply, i.e. each row, column and region has to contain the digits from 1 to 8. Digits on a thermometer strictly increase from the bulb end. Digits on a grey line form a palindrome, i.e. they read the same forward and backward. Digits joined by a black dot have a 1:2 ratio. (Not all black dots are given.)