Contact Us | Emergency Services Call 918-258-5300 Home About Us New Equipment Services & Tech CFD Flameless Heaters Sight Doors New Equipment Great Southern Technologies (GST) is a specialty engineering company that encompasses unique creative & custom design methodologies to all new and used direct fired heaters and auxiliary equipment. As an InServ company, GST also incorporates optimal constructability methods to every project that allows for minimum turnaround duration and cost. The integrated concept that makes up InServ's core business objective affords the ability to provide the client a single source from conception to installation. This type of project execution reduces potential problems during installation and eliminates the risk of back charges typically experienced when required to work with a number of different companies for a given project. API-560 Units Non-API Direct Fired Heaters Selective Catalytic Reduction System (SCR) Combustion Air Preheat Systems Steam Generation Systems Waste Heat Recovery Systems 24/7 Emergency Response 918-258-5300 InServ Contact Us 1013 West Ithica Street Broken Arrow, OK 74012 Phone: 918-258-5300 Fax: 918-258-5353 info@GreatSouthernGroup.com © 2021 Great Southern Technologies. All Rights Reserved.