The chassis engine shall be equipped with plugged openings to supply hot water for the school bus heating system. The openings shall be suitable for attaching 3/4 inch pipe thread/hose connectors. The engine shall be capable of supplying water having a temperature of at least 170° F at a flow rate of 50 pounds/per minute at the return end of 30 feet of 1 inch inside diameter automotive hot water heater hose. See SBMI Standard No. 001 in Appendix A.
67 Pa. Code § 171.26
The provisions of this §171.26 amended under the Vehicle Code, 75 Pa.C.S. §§ 4103, 4551-4553 and 6103.