Taco cited the rising cost of raw materials, primarily metals, as the cause for its price increases, effective Dec. 1, 2004. On the residential side, price increases ranged from 3% for cast iron 00, LM and 110 circulators to 12% for tank and Venturi fittings. All commercial pump and tank products and parts increased by 7%. Heat transfer products and parts increased by 10%, and Accu-Flo products increased by 4%.