D&H Equipment fabricates helical hot oil heaters for the asphalt industry. Our redesigned second-generation heaters are designed to be simple, efficient and made right here in our Blanco, Texas facility. D&H offers four heater sizes ranging from 1 to 4 million BTU/hour output. The design and components are rated up to 550 degrees F for more heat transfer and for faster heat when needed. Our heaters can be designed for single or multiple circuit operation.