Add to Cart Quick view SALE Balboa Water Group Heater, FloThru, BWG Revolution, 18-13/32" x 2", 4.0kW, 230v $904.95 $475.95 Balboa Water Group Replacement heater assembly for Balboa Revolution System. 18-13/32" x 2", 4.0kW, 230v 800 incoloy heater in a plastic housing with Balboa M7 sensors. Heater union fittings and gaskets sold separately. Add to Cart Add to Wishlist