Havertz heaped praise on Tuchel after the German manager masterminded four second-half goals at Turf Moor.
The Blues came out a different side after the break and eased to a 4-0 win following a lacklustre first half display.
He said: "We're very pleased. The result is very good for us. We needed these goals and the clean sheet.
"It was difficult, especially in the first half. It was important that we scored early in the second half.
"We switched our formation a little bit [at half-time] - I think that helped us. Reece's goal was brilliant and it helped us a lot. We're pleased about these four goals.
"The confidence is there. I think after the loss in the Carabao Cup final it was a little bit hard to come back, but we showed great character in the FA Cup.
"The first six months of the year were hard, especially the winter when we had a lot of injuries. We're on a good run again and we want to keep that going."
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