Patented NiTek Heat Exchanger Technology provides 300% more erosion resistant than copper & 200% more than cupronickel*(Only on HD models). Patented straight tube heat exchanger lasts longer by eliminating bends and helical coils. Patented ProTek Shield zinc anode helps protect the heat exchanger from galvanic corrosion, including corrosion associated with saltwater pool systems. Powder-coated steel cabinet with updated slate gray aesthetic – looks good on every pad. Free Wi-Fi control and fleet monitoring dashboard through Raymote. Fast and energy efficient with 84% thermal efficiency (2028 DOE TEi compliant) on all copper and NiTek (HD) models.