Built to withstand the toughest industrial conditions with heavy duty construction, copper-silicon alloy tappings, and a high-impact composite jacket; the Hubbell Resistance ER (explosion resistant) intrinsically safe water heater is our solution for any hazardous environment. The sealed heating element is safe from any hazardous vapors or dust. Operating controls are housed within a heavy-duty electrical enclosure for smooth performance in hazardous locations. The electrical conduit is factory sealed to meet UL and CSA operation codes. Ready for electrical and plumbing service connections.