Rule 15-10-76-3.2.15 - Stop Valves and Check Valves1. If a boiler can be closed off from the heating system by closing a steam stop valve, there shall be a check valve in the condensate return line between the boiler and the system.2. If any part of a heating system can be closed off from the remainder of the system by closing a steam stop valve, there shall be a check valve in the condensate return pipe from that part of the system.15 Miss. Code. R. 10-76-3.2.15
Miss. Code Ann. § 45-23-9