Patent ID: 8755682

Claim:
A fluid heater, comprising: a heating element tube; first and second headers disposed proximate respective first and second ends of the heating element tube, each header defining a respective fluid passage arranged for fluid communication with the heating element tube, and the second header comprising: a body that defines a fluid passage having an inlet side and an outlet side, the fluid passage arranged for fluid communication with an interior of the heating element tube; and a flow conditioning element connected to the body and arranged for fluid communication with the fluid passage, the flow conditioning element including a plurality of elements each connected to the body proximate an inner wall of the fluid passage defined by the body; a first seal interposed between the first end of the heating element tube and the first header; a second seal interposed between the second end of the heating element tube and the second header; a first header plate disposed proximate the first header; a second header plate disposed proximate the second header; a plurality of tie bolts connecting the first and second headers to each other; and a spring disposed on each tie bolt and arranged to be compressed by a corresponding nut on that tie bolt as the nut is tightened on the tie bolt.