Raypak Hi Delta Hot Water Boiler- 9 HP. Model: H3-302A. S/N: 9904158613. Low pressure boiler. Capacity: 51 gpm. MAWP (water): 160 psi. Input: 300,00 Btu/hr. Output: 252,000 Btu/hr. Minimum relief valve capacity: 400 lbs/hr. Heating surface area: 40 sq. ft. Maximum water temperature: 250 °F. Ideal for hydronic heating in commercial and industrial environments. Efficiency up to 84% which provides the exact gas, air and heat transfer. Low NOx emissions. Features finned copper tube heat exchanger and multi-port stainless steel burners. Indoor or outdoor use. Inlets: (1) 2 in. dia. NPT (male). Outlets: (1) 3/4 in. dia. copper pipe (pressure relief), (1) 2 in. dia. NPT (male), (1) 5 in. dia. duct (combustion air). Overall dimensions: 48 in. L x 26-1/2 in. W x 39 in. H.