N.H. Rev. Stat. Ann. § 519:9

The superior court with the consent of the parties shall, and without the consent of the parties may, commit to one or more referees any cause at law or in equity, or the determination of any question of fact pending in court wherein the parties are not, as matter of right, entitled to a trial by jury; and with the consent of the parties shall so commit any other cause or the determination of any other question of fact.