It's a standing pilot light, the flame also produces constant low levels of electricity (Millivolts) to control the safety and gas valves.
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A millivolt pool heater has a standing pilot (meaning it is always lit). This uses a small amount of energy as well as it can attract bugs and vermine to its warmth. Millivolt heaters are considered older technology. Electronic ignition heaters have electronics that allow the pilot to be lit only just when you are starting the heater. These electronic componants usually also allow for self-diagnostic features on most heaters. This is considered newer technology and is the direction the industry is moving in. Millivolt heaters are usually slightly less expensive and are easier to work on mechanically, but electronic heaters are becoming more popular and technicians are learning to work on them more and more and they will soon replace Millivolt heaters. You can find great deals and free shipping on both Millivolt and Electronic ignition heaters and more information at www.swimmingpoolsetc.com!
One thousandth part of a volt. Correct Answer=0.001
that would be 1000. milli means one thousandth of the base unit (volt) millimeter is one thousandth of a meter. milliliter is one thousandth of a liter. milligram is one thousandth of a gram
I am assuming that you mean switching a millivolt gas value. The switch applies a voltage to the gas valve thus allowing gas to flow. The voltage is provided by a thermopile. This device transforms the heat from the pilot into a voltage that can be used to control the valve. This system does not require an external voltage source. It does require the pilot to continuously operate. A thermopile consists of a number of thermocouples that are wired in series. This allows an increase in the voltage that would be provided by a single thermocouple.
One ohm is a particular reading on the ohms scale of a multimeter. It corresponds, per Ohm's Law, to the resistance that a current of one ampere would cause a potential difference of one volt across. (Or one millampere and one millivolt, however it happens to scale.)