Marquis Spas Marquis Spas Flow Thru Heater Assy, 4.3Kw 12" Long (Marquis Spas) - 740-0584 Marquis Spas Flow Thru Heater Assy, 4.3Kw 12" Long (Marquis Spas) - 740-0584 MSRP: $446.67 Was: Your Price: On Sale: $270.71 Add to Cart