Changing Depreciation Schedule

[Vlad K.]

I had an accountant prepare my taxes a few years ago and she depreciated some water heaters using a 15 year schedule. I followed suit and did the same thing when I did my taxes last year. Now I'm using TurboTax and it is saying that it should be a 5 year depreciation. TurboTax let me enter what I've paid so far and the depreciated this year based on a 5 year schedule. Is it OK to switch?

TLDR: Can you switch the length of time over which you depreciate once you've started?