The "R" Series oil, gas, low NOx natural gas, and dual fuel burners from Riello Burners (Hingham, MA) are designed for commercial and process applications. The firing ranges/capacities are: dual fuel from 177,000 to 4.76 million Btuh; gas from 177,000 to 7,813,000 Btuh; natural gas low NOx from 307,000 to 6,338,000 Btuh; and light oil from 2.4 to 65.6 USgph.