SEW has the potential for improved production rates but requires environmental assistance from producers. Heat must be provided to ensure that pigs are kept warm, above their LCT. One proven method of providing heat to SEW pigs is by hot water floors. They provide heat to the pigs at rest when they need it most. Using this system, room temperature can be reduced substantially over forced air heating systems thereby saving on heating costs. It is critical to ensure the hot water heat system is properly designed. New developments include a new heat exchanger tube which provides uniform heat output and two stage heaters save 12% in operating costs over single stage heaters.