Abstract: A self-contained portable heating system to heat a stored liquid in a storage tank to a desired temperature is provided. The system can comprise operatively connected components such as a generator to power a burner that can transfer energy from a combustion product, from for example, a fuel supplied by an attached fuel tank, to a heat transfer fluid through the use of a boiler. The heat transfer fluid can transfer heat from the boiler to a heat exchanger which can then transfer heat to the stored liquid in the tank. The tank can also comprise a circulating pump that can circulate the heat transfer fluid and an expansion tank that can receive the heat transfer fluid when it expands as a result of being heated. In some embodiments, the heating components can be supplied separately from storage tank so that they can be retrofit onto an existing tank.

Abstract: A state and operation indicator for a snap switch is provided. Presently, instrumentation is often needed in order to determine if a snap switch is malfunctioning. Information may be provided on a control panel inconveniently positioned remotely as compared with the location of the snap switch itself. This disclosure provides for an indicator of the state and operation of a snap switch, which does not require the use of instrumentation, and which is proximate the snap switch. This indicator can be used in both alternating and direct current circuits. When the common terminal of the switch is energized an associated light can provide a cue that the power is on. The state and operation indicator can also have either a light associated with the normally open terminal, a light associated with the normally closed terminal, or both. These lights can respond to indicate the state and operation of the switch.