Method and Apparatus for Heating a Stored Liquid

A method of heating a stored liquid comprising:

• powering a burner firing into a boiler;
• using the fired boiler to heat a heat transfer fluid;
• circulating the heated heat transfer fluid through a heat exchanger;
• contacting the heat exchanger with the stored liquid to be heated such that the stored liquid is heated.

A self-contained portable apparatus for heating a liquid, the apparatus to be retrofit to a storage tank, the apparatus comprising:

• a power source for powering a burner firing into a boiler, the boiler in fluid connection with a circulating pump;
• wherein the boiler is configured to heat a heat transfer fluid which is pumped by the circulating pump to a first attachment configured to attach to a heat exchanger;
• a second attachment configured to attach downstream from the heat exchanger and is fluidly connected to the boiler in such a manner to return cooled heat transfer fluid to the boiler to be reheated;
• and
• a third attachment configured to attach to an expansion tank to allow for the expansion of the heat transfer fluid as it is heated.