If you have a lot of heat, then you can do what power plants do: Use the heat to generate steam, and use the steam to spin a turbine. The turbine can drive a generator, which produces electricity. This setup is very common, but it requires a fair amount of equipment and space.
If you would like to convert heat to electricity in a simple way that has no moving parts, this usually involves thermoelectric generators.
A Thermoelectric Power Generator (TEG), is any solid-state device that can convert heat directly into electricity through TEG Power. Such devices are based on thermoelectric effects involving interactions between the flow of heat and of electricity through solid bodies. As the heat passes through a TEG Module, some of the electrical energy is converted to electricty while the majority of it is transfered as heat. Thermoelectric Generators need a heat source on one side, and a cold sink on the other as they work on temepature difference.
Tegpro Thermoelectric Generator Modules available at Tegmart
All TEG Power generators have the same basic configuration. A heat source provides the high temperature, and the heat flows through a thermoelectric converter to a heat sink, which is maintained at a temperature below that of the source. The temperature differential across the converter produces direct current to a load having a terminal voltage and a terminal current. As there is no intermediate energy conversion process, thermoelectric power generation is classified as direct power conversion. High Temperature TEG Power applications such as biomass boilers, gas hydronic systems & propane heating systems are ideal candidates for self-powered operation. This would allow future power systems to start via a device such as a battery bank or Tesla Power Wall, while contributing power while running, back into the grid. Circulator pumps, thermostats and all control systems would be powered as well. Tegpro has been working on self-powered hydronic heating systems since 2008 and made advances in the technology.
More information about Thermoelectric Generators (Wikipedia)
Videos of Thermoelectric Generators (YouTube)
Leading Source of Thermoelectric Generator Information (TEGPower.com)
More information Web Sites about Thermoelectric Generators below:
Basics of Thermoelectric Generators
Thermoelectric Generator Definitions
Basic information on the Thermoelectric Generator
More information on the Thermoelectric Generator
Electricity from Heat Educational Page
Stove Lite (World's First Wood Stove Powered Thermoelectric Lantern)
Devil Watt (Wood Burning Stove Thermoelectric Generators)
TEGPRO (Experts of TEG systems)
Tegulator (Complete line TEG power regulators Made in the USA)
Tegmart (Online Store: Wood Burning Stove Thermoelectric Generators, Energy Harverting Regulators (Tegulator), Thermoelectric Generator Modules and TEG Power Modules