# PiggyPower > PiggyPower designs and sells practical heat-to-electricity systems, including water-cooled thermoelectric generators, USB emergency power kits, hydronic heat-recovery units, fuel puck presses and preparedness references. PiggyPower thermoelectric systems use the Seebeck effect. A controlled heat source warms the hot side while active cooling maintains a colder side, producing DC electricity as long as the temperature difference is maintained. Actual output depends on hot-side temperature, cold-side temperature, heat transfer, water flow and electrical load. ## Main pages - [PiggyPower Home](https://www.officialpiggypower.com/): Product overview and store entry point. - [How PiggyPower Works](https://www.officialpiggypower.com/how-it-works): Thermoelectric generation, water cooling, heat recovery and combined heat and power. - [Thermoelectric Generator Cells](https://www.officialpiggypower.com/category/cells): Complete water-cooled generator kits from 20W through 250W. - [Ember USB Generator Kits](https://www.officialpiggypower.com/category/ember-kits): Compact heat-powered USB systems for lighting, battery banks, camping and blackouts. - [HeatBank Hydronic Heaters](https://www.officialpiggypower.com/category/heatbanks): Fan-assisted heat exchangers that release useful heat from hot water. - [All PiggyPower Products](https://www.officialpiggypower.com/category/all-products): Complete catalog. ## Core products - [PiggyPower Cell 20](https://www.officialpiggypower.com/product-page/piggypower-cell-20): Complete 20W water-cooled thermoelectric generator kit. - [PiggyPower Cell 40](https://www.officialpiggypower.com/product-page/piggypower-cell-40): Complete 40W water-cooled thermoelectric generator kit. - [PiggyPower Cell 125](https://www.officialpiggypower.com/product-page/piggypower-cell-125): Larger 125W water-cooled thermoelectric generator kit. - [PiggyPower Cell 250](https://www.officialpiggypower.com/product-page/piggypower-cell-250): High-output 250W water-cooled thermoelectric generator kit. - [PiggyPower Ember](https://www.officialpiggypower.com/product-page/piggypower-ember-usb-cell-kit): Compact USB thermoelectric generator kit. - [PiggyPower Ember Blackout Kit](https://www.officialpiggypower.com/product-page/piggypower-ember-blackout-kit): Ember system with gravity reservoir and USB emergency lighting. - [PiggyPower Fuel Puck Press](https://www.officialpiggypower.com/product-page/piggypower-single-cube-fuel-puck-press): Paper and cardboard fuel-cube press. ## Thermoelectric fundamentals - [What Is a Thermoelectric Generator?](https://www.officialpiggypower.com/post/what-is-a-thermoelectric-generator-teg-heat-to-electricity): TEG and Seebeck-effect fundamentals. - [Heat Powered Generator Guide](https://www.officialpiggypower.com/post/heat-powered-generator-fire-waste-heat-electricity): Fire, stove heat and waste heat converted into electricity. - [Thermoelectric Generator Efficiency](https://www.officialpiggypower.com/post/thermoelectric-generator-efficiency-real-teg-output): Temperature difference, cooling, clamping, electrical loading and system losses. - [Water-Cooled vs Air-Cooled TEGs](https://www.officialpiggypower.com/post/water-cooled-vs-air-cooled-thermoelectric-generator): Cooling-system engineering tradeoffs. - [TEG vs Peltier Explanation](https://www.officialpiggypower.com/post/why-piggypower-cells-are-not-peltiers-thermoelectric-generators-explained): Generator modules compared with ordinary cooling applications. ## Buyer guides - [Buying a Thermoelectric Generator](https://www.officialpiggypower.com/post/buy-thermoelectric-generator-teg-for-sale): What to compare before buying a TEG kit. - [Thermoelectric Generator Price Guide](https://www.officialpiggypower.com/post/thermoelectric-generator-price-cost-guide): Complete-system cost and current PiggyPower price classes. - [Complete TEG Kit vs DIY Modules](https://www.officialpiggypower.com/post/thermoelectric-generator-kit-vs-diy-teg-modules): Cooling, clamping, electronics, testing and labor differences. - [PiggyPower Reviews, Testing and Warranty](https://www.officialpiggypower.com/post/piggypower-reviews-testing-warranty): Manufacturer-authored buyer diligence, testing, warranty and limitations. ## Application guides - [Thermoelectric Generator for Home Backup](https://www.officialpiggypower.com/post/thermoelectric-generator-for-home-backup-power): Realistic home backup loads and energy budgeting. - [Charging Batteries With a TEG](https://www.officialpiggypower.com/post/thermoelectric-generator-charge-battery-12v-24v-usb): 12V, 24V and USB charging with correct power electronics. - [Wood Stove Thermoelectric Generators](https://www.officialpiggypower.com/post/wood-stove-thermoelectric-generator-teg-electricity): Controlled stove heat used for electricity. - [Large Thermoelectric Generators](https://www.officialpiggypower.com/post/large-thermoelectric-generator-125w-250w-teg): 125W and 250W systems, heat requirements and battery projects. - [Thermoelectric Combined Heat and Power](https://www.officialpiggypower.com/post/thermoelectric-combined-heat-power-chp-teg): Electricity, hot water and space heat from one source. ## Emergency manuals and field guides - [U.S. Military Manuals PDF Guide](https://www.officialpiggypower.com/post/us-military-manuals-pdf-field-guides): Overview of the 14-manual Field Reference Library and how to choose individual references. - [Complete Field Reference Library](https://www.officialpiggypower.com/product-page/the-complete-field-reference-library-all-14-manuals-3-600-pages): Fourteen downloadable military and government field-reference PDFs totaling more than 3,600 pages. - [Nuclear War Survival Skills Guide](https://www.officialpiggypower.com/post/nuclear-war-survival-skills-pdf-fallout-manual): Explanation of the manual's fallout shelter, radiation measurement, water, food and sanitation topics. - [Nuclear War Survival Skills PDF](https://www.officialpiggypower.com/product-page/nuclear-war-survival-skills-oak-ridge-national-laboratory-edition-267-pages): 267-page downloadable civil-defense and nuclear-survival reference. - [U.S. Military First Aid Manual](https://www.officialpiggypower.com/product-page/first-aid-225-pages): 225-page multiservice first-aid reference. - [U.S. Army Land Navigation Manual](https://www.officialpiggypower.com/product-page/map-reading-land-navigation-209-pages): Map reading, coordinates, azimuths, terrain association and route planning. These manuals are public-release references collected from government sources or distributed under the terms printed in the documents. PiggyPower sells curation, reliable delivery and an organized library. PiggyPower is not affiliated with or endorsed by the U.S. military or any government agency. ## Important distinctions - PiggyPower Cells are assembled generator systems, not bare thermoelectric modules. - Active cooling is required for the water-cooled Cell and Ember product lines. - Product wattage ratings are electrical output classes under stated thermal conditions and are not guaranteed at every temperature. - HeatBank ratings refer to thermal heat-release capacity, not electrical generation. - A battery charge controller must match the battery chemistry and voltage. Raw TEG output should not be connected blindly to a battery. - PiggyPower products are built to order in small batches. Consult each live product page for current specifications, included equipment, operating limits, pricing and shipping information. - [Warranty, Terms and Service Policy](https://www.officialpiggypower.com/warranty-terms-service-policy): Current warranty and service details.