The total hydronic radiant tubing sold in 2004 was in excess of 331 million, including a reported 265.5 million lineal feet of tubing sales and an additional estimated 66 million linear feet.
Half-inch tubing continues to dominate the market with a 70.5% share of all tubing sold. Five-eighths tubing is second at 10.8% with three-eighths close behind at 9.6%. Three-quarters inch tubing at 7.8% and one-inch at 1.3% represent primarily commercial and snow-melting installations.