About Us

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Hydro-Thermal Building

Hydro-Thermal - Your smart energy investment for over 75 years.

Hydro-Thermal is a solid company headquartered in Waukesha, Wisconsin, USA that manufactures a line of innovative direct steam injection heaters in an ISO certified plant. Our expert engineers apply our proprietary direct steam injection technology to help customers replace old process heating technology, such as heat exchangers, to meet their most difficult process heating requirements. We solve customer process heating problems by expertly sizing and designing the right direct steam injection system to save energy, reduce down-time and assure product quality.

Hydro-Thermal's fully integrated staff includes experienced product engineers who fully understand fluid heating. The talented machinists and welders who follow ASME procedures assure our products are produced to the highest standards. Sales and customer service personnel assist customers in correctly sizing and integrating direct steam injection into their process.

Request A Quote

Complete the Application Data Sheet to receive your personalized quote to fit your heating needs!

Learn more about Hydro-Thermal and DSI through Case Studies and Whitepapers on our literature page

Solutions For Every Market


Thousands of end users utilize Hydroheater® steam heaters for a wide range of difficult process and utility heating applications.  Visit application examples for more specific information.

Customer Support

+1 (262) 548-8900  
Toll Free: (800) 952-0121
info@hydro-thermal.com

Hydro-Thermal ISO Certification