N.H. Rev. Stat. Ann. § 197:24-a

The school district treasurer may appoint a deputy treasurer, subject to approval by the school board, who shall be qualified in the same manner as the treasurer and who shall perform the duties of the treasurer in the case of the treasurer's absence by sickness, resignation, or otherwise. The deputy shall be sworn, shall have the powers of the treasurer, may be removed at the pleasure of the treasurer and shall, before entering upon the duties of such office, give bond as provided in RSA 197:22.