Upgrade your SCM Relaxation Spa to a 2 HPR 2 speed pump and a convertible 1kw/4kw electric heater. The upgraded pump increases the volume of water that flows through your spa. The stainless steel convertible electric heater means quicker temperature changes. Your spa ships plug and play ready for 120-Volt 15 Amp with a 1kw heater. The heater can be converted from a 120-Volt 1kw to a 240-Volt 4kw with the installation of a 30 or 50 Amp 240-Volt electrical service, by a certified elctrician. What this means to you is improved jet performance, dramatically reduced heat recovery time, and heat levels are maintained more efficiently.