Raypak 11 KW Electric Spa / Hot Tub Heater. When electricity is the energy choice Raypak is the quality choice - dependable, trouble-free, performance-proven - with corrosion-free, 100% copper and bronze waterways. Built to last by the company renowned for reliability. All of Raypaks products are CSA certified. Easy to Install - With a compact design that fits into small spaces. Standard size, full flow 1-1/2" inlet and outlet connections are conveniently located. External current leak protectors are not required.