gas, oil, coal, solid waste, biomass & hybrid fuel-fired steam & hot water boilers. product line includes packaged boilers, fire-tube, water-tube & feedwater equipment for all heating & process applications including: schools, dry cleaning, hospitals, universities, military & all commercial/industrial operations. hurst is a custom manufacturer of engineered packaged boilers & boiler systems, biomass boiler systems, boiler controls & accessories. low nox modular boilers & burner configurations are available for all models, starting at 9.5 hp, meeting all state environmental requirements, including scaqmd.