Complete design capabilities are available within us to produce any type of economizer for any type of boiler, including bare tube, bar-fin tube, spiral wound and H-fin. Consideration is given to the type of fuel being fired, flue gas characteristics, potential for plugging, gas velocity and temperature, sootblower requirements, operating hours, load variation, and unit history. After complete evaluation, a solution is offered, selecting the appropriate tube size and material, as well as the correct finning surface, if appropriate, including BTA's "H"-fin surface for dirty flue gas applications.