Section 658-110-7 - HEAT LOSS REQUIREMENT1. New Installations. Heat loss system design and system load calculations for all new installations shall be performed prior to the installation. The licensee must retain a copy of the heat loss system design and system load calculations such that it may be produced for inspection upon request of a Board inspector.2. Replacement Systems. A heat loss and/or load calculation shall be conducted before replacement. The heat loss and/or load calculation may be obtained from the original design plans. The licensee must retain a copy of the heat loss system design or system load calculations and produce it for inspection upon request of a Board inspector.02-658 C.M.R. ch. 110, § 7