Designed for variable primary flow systems, Fulton’s ENDURA+ firetube condensing boilers represent a PURE Optimized revolution in firetube condensing boiler technology. 

 Whereas conventional boiler designs transfer stresses directly onto the most critical components, Fulton’s patent-pending stress reliever completely eliminates these stresses and significantly increases boiler longevity. 
 ENDURA+ provides industry-leading performance without sacrificing durability.