Add to Cart Quick view SALE Marquis Spas Heater Kit, FloThru, Marquis, 12" x 1-1/2", 115v/230v, 4.3kW $617.95 $324.95 Marquis SpasHeater retro-fit kit to replace old 90° curved flo-thru heater. Rated at 4.3kW/230v. This kit ships with all parts shown. Pressure switch not included Add to Cart Add to Wishlist