Hot tub heater

A hot tub heater, or spa heater is an electric or gas-fired water heater that provides the all important hot water used for soaking, and relaxing in a hot tub, Jacuzzi, or as it is often known, a portable spa. The spa heater warms water anywhere from just above freezing to the desired temperature, usually about 100 to 104 degrees F (about 38 to 40 degrees C. Portable spas and hot tubs are generally kept hot and ready for use at all times, whereas in-ground, or above-ground spas are often left cold, and heated just prior to use.