Heaters are a vital part of the spa's water system. Water at the normal temperature enters the unit and is heated by flames fueled by propane or natural gas. Warmer water exits the unit and enters the spa.

Most heaters operate with a pilot or electronic ignition.

Pilot lights are lit continuously and may require re-lighting from time to time. Lighting the pilot on a spa system is similar to that of a hot water heater. Just open the door on the front of the heater. Turn the gas valve to the pilot position. Push down the knob and the igniter button. Hold the gas valve down for a few seconds to make sure it stays lit.

Electronic ignition heaters use electricity to start the heater and contain no pilot. When you turn the heater on, a spark lights the heater.

A temperature of 100 to 102 degrees is recommended.

EXPERT TIP: Maintain spa water at 95 degrees, then heat it the additional five to seven degrees when you plan to use it. Maintaining the temperature of the spa water will actually save you money in the long run and allow you to heat the spa to the desired temperature much more quickly.

Note: Proper water balance helps extend the life of your heater. Corrosive water will cause problems for the copper heat exchanger. Make sure your water is always balanced!