Your pool and spa is a long-term investment that you, your family and friends will enjoy year after year. Now, there's an easier way to enjoy that investment more often, more reliably and more efficiently throughout the year...the Raypak pool and spa heater. The millivolt (standing pilot) version has manual thermostat knobs instead of digital controls and requires no electricity. It has a pilot light as opposed to an electronic ignition. Not for use in California.