Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-184150, 333-184151 and 333-184152 on Form S-8 and Registration Statement No. 333-184149 on Form S-3 of our reports dated February 25, 2014 relating to the financial statements and financial statement schedule of Pentair Ltd. and subsidiaries, and the effectiveness of Pentair Ltd.’s internal control over financial reporting, appearing in this report on Form 10-K of Pentair Ltd. for the year ended December 31, 2013.

/s/ Deloitte & Touche LLP

Minneapolis, Minnesota

February 25, 2014