35 Pa. Stat. § 1331.3 : Statutes (Unconsolidated) — HEALTH AND SAFETY — BOILER AND UNFIRED PRESSURE VESSEL LAW — Compliance required TEXT PDF It shall be unlawful to install or use any boiler or unfired pressure vessel in this Commonwealth which does not comply with the provisions of this act and the regulations promulgated under this act. 35 P.S.§ 1331.3 1998, June 18, P.L. 655, No. 85, § 3, effective in 30 days.