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Hydro-Thermal custom designed and manufactured this skid system to be used in a water filtration process. Hydro-Thermal custom designed and manufactured this skid system to be used in a water filtration process.

Direct Steam Injection Achieves Precise and Consistent Temperature Control for Water Filtration Systems


Water filtration is the process of taking raw untreated water and forcing it through several membranes to purify or desalinate contaminated water. The treated water can then be used in cooling tower makeup water and boiler feedwater for the Powerhouse of a facility. Inlet water must pass through multiple stages- including ultrafiltration, reverse osmosis, and deaerator tanks- to complete the process. At each step of the progress, Hydro-Thermal’s versatile and proven direct steam injection (DSI) heaters heat the inlet water, achieving precise temperature control and maintaining consistent throughput.

Water filtration systems are one of the most cost-effective, clean, and renewable energy methods at treating feed water for the boiler or Powerhouse. For a water filtration system to operate at maximum efficiency, the inlet water temperature must be calculated to size the system. If the feedwater temperature drops below design specification, the output will decrease, and energy will be wasted by overheating the water. Also, if it cools under the specification, the viscosity will increase, and the capacity of the water filtration system will decrease. Every 1°F (0.5°C) below design temperature can result in a loss of up to 3% of capacity.

Since the filters in water filtration systems are designed for a given water temperature, maintaining a constant temperature of the incoming inlet water is vital. The coldest potential temperature has to be determined to size a system correctly. During ultrafiltration, the first filtration stage inlet water needs to be heated between 70-90°F (21-32°C) before it can continue to the reverse osmosis filter. Hydro-Thermal’s Hydroheater is a tankless industrial water heater that instantly produces on-demand heated fluids more efficiently than heat exchangers or sparging systems while keeping the temperature at ±1ºof the set point. The Hydroheater is operating at the designed capacity, saving energy and increasing output.RO Diagram 01 01 01


Hydro-Thermal provides versatile and proven water purification solutions for a wide variety of industries. Our DSI heaters can heat inlet water or membrane backflush water while achieving precise on-demand temperature control and maintaining consistent throughput. Ultimately, a Hydro-Thermal DSI heater can increase the efficiency and output of your water filtration system, saving you time and money. Want to learn more about how Hydro-Thermal can improve your water filtration output? Contact us by email at This email address is being protected from spambots. You need JavaScript enabled to view it. or by phone at 800-952-0121.


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Hydro-Thermal is the global leader in the development and manufacturing of Hydroheaters. Through our vast global channel partners, we support hydro heating in six continents and all industrialized areas. We create heating systems for a variety of industries including: pulp, paper, chemical, ethanol, food & beverage, metal, & more!

Hydro-Thermal Waukesha

400 Pilot Court
Waukesha, WI 53188 USA
Phone: (262) 548-8900
Fax: (262) 548- 8908