N.H. Rev. Stat. § 490-D:3
Notwithstanding any law to the contrary, the judicial branch family division shall have the powers of a court of equity in cases where subject matter jurisdiction lies with the judicial branch family division. Suits in equity where subject matter jurisdiction lies with the judicial branch family division including, but not limited to, petitions for divorce, nullity of marriage, alimony, custody of children, support, and other similar proceedings may be heard upon oral testimony or depositions, or both, or when both parties consent, or service having been made and a notice of the time and place of the hearing having been given, when both parties appear. Such suits may be heard by any justice of the judicial branch family division at any time, but nothing contained in this section shall be construed as limiting the power of the judicial branch family division to have issues of fact framed and tried by a jury, according to the rules in equity, or the course of such proceedings at common law.
RSA 490-D:3
2005, 177:14, eff. July 1, 2005.