All gas burning equipment and systems, both new and existing, and parts thereof must be maintained in a safe condition.
When performing any service on a customer's gas system, the licensee must notify the property owner in writing of any code violations and make recommendations to address them.
When performing an annual tune-up on a gas-fired central heating system, a combustion efficiency test must be conducted and a copy of the test results must be posted on-site.
02-658 C.M.R. ch. 13, § 3