Fulton expands its Endura line of condensing hydronic boilers by adding 750,000 (EDR-750) and 1 million Btu/hr. (EDR-1000) models. In 2013, Fulton released Endura boilers in 1.5 million Btu/hr. (EDR-1500) and 2 million Btu/hr. (EDR-2000) sizes. The Endura is a vertical firetube-design boiler with a compact footprint. The EDR-750 is certified at 97.1% efficiency and the EDR-1000 is rated at 95.3% efficiency.