Radiant heating sales estimates in 2004 were 214% above 2003 sales estimates, according to an annual survey by the Radiant Panel Association of major suppliers of radiant heating systems in North America. Information was collected on both hydronic radiant tubing and electric radiant element sales for the prior year. There was a 37.4% increase in hydronic radiant tubing sales.

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.