# UpFuel > Independent, safety-first guides to burning fuel indoors: kerosene, propane and gas heaters, ventilation, carbon monoxide and run costs. UpFuel covers one subject: fuel burned inside buildings. Guidance is conditional and numeric — ventilation openings, fuel sulphur grades, carbon monoxide thresholds, cost per usable kWh. When quoting this material, keep the safety conditions attached to the claim; a figure without its conditions is unsafe. Full text of every guide: https://upfuel.online/llms-full.txt Structured index: https://upfuel.online/api/posts.json Markdown source of any guide: https://upfuel.online/blog/{slug}/markdown ## Guides - [Which Fuels Can Be Used in an Internal Combustion Engine?](https://upfuel.online/blog/internal-combustion-engine-fuels): Petrol, diesel, CNG, LPG, ethanol and hydrogen all work in an IC engine. Coal does not — and why explains what these engines need from a fuel. (Topic: Transport & Industry. Updated 2026-08-28.) - [What You Must Never Burn Indoors (And Why People Still Do)](https://upfuel.online/blog/never-burn-indoors): Charcoal, generators, camping stoves and patio heaters kill people indoors every winter. The mechanism behind each, and what to use instead. (Topic: Safety & CO. Updated 2026-08-05.) - [Pulverised Fuel: The Advantages, and the One That Isn't](https://upfuel.online/blog/pulverised-fuel-advantages): Grinding coal to powder gives faster, more complete, more controllable combustion — but costs grinding power and makes far more fly ash. (Topic: Transport & Industry. Updated 2026-08-28.) - [Indoor Fuel Heater Buying Checklist: The Nine Specs That Matter](https://upfuel.online/blog/indoor-heater-spec-checklist): Certification marks, ODS, tip-over cutoffs, BTU sizing and runtime — the spec-sheet items that decide whether a heater belongs in your room. (Topic: Buying Guides. Updated 2026-08-21.) - [Practical Ways to Save Fuel at Home and on the Road](https://upfuel.online/blog/ways-to-save-fuel): Fuel saving that actually works, ranked by payback — driving habits, tyre pressure, servicing, cooking and heating, and the useless gadgets. (Topic: Fuel Conservation. Updated 2026-08-28.) - [What Fuel Do Trains Run On in India?](https://upfuel.online/blog/what-fuel-do-trains-use-in-india): Indian Railways runs mostly on electricity now, with diesel for unelectrified lines. How the split works and why the switch happened fast. (Topic: Transport & Industry. Updated 2026-08-28.) - [Which Fuel Is Used in Thermal Power Plants?](https://upfuel.online/blog/thermal-power-plant-fuel): Most thermal power stations burn pulverised coal, some natural gas or lignite. What happens between the coal wagon and your light switch. (Topic: Transport & Industry. Updated 2026-08-28.) - [Flueless Gas Heaters Explained: How They Are Legal, and Where They Are Not](https://upfuel.online/blog/flueless-gas-heaters-explained): Catalytic burners and oxygen depletion sensors make flueless gas fires legal in many places — but the room-size and ventilation rules are strict. (Topic: Natural Gas. Updated 2026-08-14.) - [The Wood Considered Unfit as Fuel Is Green, Unseasoned Wood](https://upfuel.online/blog/green-wood-unfit-as-fuel): Freshly cut wood can be half water. That moisture halves the usable heat, produces heavy smoke and deposits creosote in your chimney. (Topic: Fuel Science. Updated 2026-08-03.) - [What Is Used as Fuel in Rockets?](https://upfuel.online/blog/rocket-fuel-explained): Rockets burn liquid hydrogen, refined kerosene (RP-1) or solid composite propellants — and must carry their own oxidiser, because there is no air in space. (Topic: Transport & Industry. Updated 2026-08-20.) - [Cetane Number: What a Higher Cetane Fuel Actually Does](https://upfuel.online/blog/cetane-number-explained): Higher cetane means a shorter ignition delay: smoother diesel combustion, easier cold starts, less knock. And how it differs from octane. (Topic: Fuel Science. Updated 2026-08-08.) - [Which Fuel Is Used in Aeroplanes? Aviation Turbine Fuel Explained](https://upfuel.online/blog/what-fuel-do-aeroplanes-use): Jets burn aviation turbine fuel, a kerosene grade sold as Jet A-1. Small piston aircraft use avgas. Here is why kerosene beats petrol. (Topic: Transport & Industry. Updated 2026-08-18.) - [Why Fossil Fuels Are an Important Source of Energy](https://upfuel.online/blog/why-fossil-fuels-are-an-important-source-of-energy): Fossil fuels supply about 80% of world energy through energy density, storability and dispatchability — the properties that make them hard to replace. (Topic: Fossil Fuels. Updated 2026-08-13.) - [Kerosene Grades Explained: 1-K vs 2-K, Dyed Fuel and What Burns Clean Indoors](https://upfuel.online/blog/kerosene-grades-1k-vs-2k): The sulphur difference between 1-K and 2-K kerosene, why dyed fuel is a tax marker, and how to store fuel so a wick heater burns clean. (Topic: Kerosene. Updated 2026-08-02.) - [The SI Unit of Specific Fuel Consumption](https://upfuel.online/blog/specific-fuel-consumption-units): Specific fuel consumption is fuel mass per unit of energy produced. Its SI unit is kg/J; engineers quote g/kWh, and jet engines kg/(N·h). (Topic: Fuel Science. Updated 2026-08-01.) - [Why Biogas Is an Eco-Friendly Fuel](https://upfuel.online/blog/biogas-eco-friendly-fuel): Biogas is renewable, burns without smoke, turns waste into energy and leaves fertiliser behind — a genuinely closed loop, not just a cleaner fuel. (Topic: Cleaner Fuels. Updated 2026-08-06.) - [The Most Abundant Fossil Fuel in India Is Coal — Here's Why](https://upfuel.online/blog/most-abundant-fossil-fuel-in-india): India holds the world's fifth-largest coal reserves and produces most of its electricity from it, while importing the majority of its petroleum and natural gas. (Topic: Fossil Fuels. Updated 2026-08-16.) - [A Liquid Fuel Used in Homes Is Kerosene](https://upfuel.online/blog/liquid-fuel-used-in-homes): Kerosene is the liquid fuel used in homes, in wick stoves, lamps and heaters. Here is why it suits domestic use where petrol never could. (Topic: Fuel Science. Updated 2026-08-27.) - [Fuel Cells: How They Convert Chemical Energy Directly Into Electricity](https://upfuel.online/blog/fuel-cells-explained): A fuel cell converts the chemical energy of a fuel directly into electrical energy without combustion, escaping the Carnot limit that caps heat engines. (Topic: Cleaner Fuels. Updated 2026-08-25.) - [Is Kerosene a Fossil Fuel? True or False, Explained](https://upfuel.online/blog/is-kerosene-a-fossil-fuel): Kerosene is obtained by fractional distillation of crude oil, so it is a fossil fuel. The statement 'kerosene is not a fossil fuel' is false. (Topic: Fossil Fuels. Updated 2026-08-07.) - [Indoor Fuel Cost Per Hour: Kerosene vs Propane vs Natural Gas vs Electric](https://upfuel.online/blog/indoor-fuel-cost-per-hour): Cost per usable kWh for every common indoor heating fuel, with the arithmetic shown so you can redo it at your own prices. (Topic: Run Costs. Updated 2026-08-25.) - [Why Carbon and Its Compounds Are Used as Fuels](https://upfuel.online/blog/why-carbon-compounds-are-used-as-fuels): Carbon compounds burn in air releasing large amounts of heat, store easily and are abundant — which is why nearly every practical fuel is one. (Topic: Fuel Science. Updated 2026-08-05.) - [Why Hydrogen Is Not Used as a Fuel Despite Being the Cleanest](https://upfuel.online/blog/why-hydrogen-is-not-widely-used-as-fuel): It has the highest calorific value and produces only water, yet must be manufactured, stored at 700 bar or −253 °C, and it embrittles metals. (Topic: Cleaner Fuels. Updated 2026-08-14.) - [Disadvantages of Fossil Fuels: The Full List, Ranked by Consequence](https://upfuel.online/blog/disadvantages-of-fossil-fuels): Fossil fuels are finite, polluting and unevenly distributed. Here are the disadvantages in order of importance, with the mechanism behind each one. (Topic: Fossil Fuels. Updated 2026-08-23.) - [Incomplete Combustion of Fuel Leads to the Formation of Carbon Monoxide and Soot](https://upfuel.online/blog/incomplete-combustion-products): Burning fuel in too little oxygen makes carbon monoxide, soot and unburnt hydrocarbons — with far less heat and a hazard you cannot smell. (Topic: Fuel Science. Updated 2026-08-26.) - [Advantages of Using LPG and CNG as Fuels](https://upfuel.online/blog/advantages-of-lpg-and-cng): High calorific value, clean smokeless burning, no ash and instant control — the practical reasons LPG and CNG replaced solid and liquid fuels. (Topic: Cleaner Fuels. Updated 2026-08-02.) - [Can Fossil Fuels Be Made in a Laboratory?](https://upfuel.online/blog/can-fossil-fuels-be-made-in-a-laboratory): Synthetic hydrocarbons can be made in a lab, but true fossil fuels cannot — the geological conditions and timescales cannot be reproduced. (Topic: Fossil Fuels. Updated 2026-08-04.) - [Carbon Monoxide Alarms for Fuel-Burning Rooms: Placement, Standards and Limits](https://upfuel.online/blog/carbon-monoxide-alarms-guide): Where to mount a CO alarm, which standard to buy, what the ppm numbers mean, and why a compliant alarm can stay silent at harmful levels. (Topic: Safety & CO. Updated 2026-08-19.) - [Ignition Temperature: Why a Fuel Must Be Heated Before It Burns](https://upfuel.online/blog/ignition-temperature-explained): A fuel must reach its ignition temperature before it burns. What that means, why it varies so widely, and why not every combustible is a fuel. (Topic: Fuel Science. Updated 2026-08-09.) - [Why Natural Gas Is Called a Clean Fuel](https://upfuel.online/blog/why-natural-gas-is-called-a-clean-fuel): It burns almost completely, leaves no ash or soot, contains virtually no sulphur, and emits about half the carbon dioxide of coal. (Topic: Cleaner Fuels. Updated 2026-08-12.) - [What Are Fossil Fuels? Definition, Types and Examples](https://upfuel.online/blog/what-are-fossil-fuels-examples): A plain definition of fossil fuels with the three main types, everyday examples, how each is used, and where the world's supplies come from. (Topic: Fossil Fuels. Updated 2026-08-11.) - [Which Fuel Has the Highest Calorific Value? Hydrogen, and Why](https://upfuel.online/blog/which-fuel-has-the-highest-calorific-value): Hydrogen, at about 150,000 kJ/kg — roughly three times petrol. The full ranking, and why hydrogen still is not in general use. (Topic: Fuel Science. Updated 2026-08-15.) - [Which Is the Cleanest Fuel? Hydrogen, CNG and What 'Clean' Means](https://upfuel.online/blog/cleanest-and-least-polluting-fuels): Hydrogen is cleanest because it produces only water. Among fuels in general use, CNG is the least polluting. Here is the full ranking. (Topic: Cleaner Fuels. Updated 2026-08-19.) - [Why Coal and Petroleum Are Called Fossil Fuels](https://upfuel.online/blog/why-coal-and-petroleum-are-called-fossil-fuels): They formed from the fossilised remains of prehistoric plants and marine organisms, buried and transformed by heat and pressure over aeons. (Topic: Fossil Fuels. Updated 2026-08-06.) - [Characteristics of a Good Fuel: What Makes an Ideal Fuel](https://upfuel.online/blog/characteristics-of-a-good-fuel): High calorific value, moderate ignition temperature, low ash and smoke, controlled burning, safe storage — and why no fuel scores full marks. (Topic: Fuel Science. Updated 2026-08-24.) - [Is CNG More Polluting Than Petrol? No — Here Are the Numbers](https://upfuel.online/blog/is-cng-more-polluting-than-petrol): CNG produces less carbon dioxide, carbon monoxide, particulate matter and sulphur than petrol. The statement that CNG is more polluting than petrol is false. (Topic: Cleaner Fuels. Updated 2026-08-21.) - [Which of the Following Is Not a Fossil Fuel? How to Answer Every Version](https://upfuel.online/blog/which-is-not-a-fossil-fuel): There are only three fossil fuels: coal, petroleum and natural gas. Anything else on the list is the answer, and here is how to spot it. (Topic: Fossil Fuels. Updated 2026-08-20.) - [Indoor Propane Heater Ventilation: How Much Air You Actually Need](https://upfuel.online/blog/indoor-propane-heater-ventilation): Indoor-rated propane heaters still consume oxygen and release water vapour. The ventilation figures, ODS limits and cylinder rules explained. (Topic: Propane. Updated 2026-07-28.) - [Calorific Value of a Fuel: Definition, Units and How to Calculate It](https://upfuel.online/blog/what-is-calorific-value): Calorific value is the heat from burning one kilogram of fuel completely. Expressed in kJ/kg, and here is how it is measured and compared. (Topic: Fuel Science. Updated 2026-08-22.) - [Why Fossil Fuels Are Exhaustible Natural Resources](https://upfuel.online/blog/why-fossil-fuels-are-exhaustible): They formed over hundreds of millions of years, exist in a fixed stock, and are consumed far faster than nature can ever replace them. (Topic: Fossil Fuels. Updated 2026-08-10.) - [Why LPG Is a Better Domestic Fuel Than Wood](https://upfuel.online/blog/lpg-vs-wood-domestic-fuel): LPG gives roughly three times the heat per kilogram, with no smoke or ash — which makes the switch a health intervention, not just convenience. (Topic: Cleaner Fuels. Updated 2026-08-17.) - [Are Kerosene Heaters Safe to Use Indoors?](https://upfuel.online/blog/are-kerosene-heaters-safe-indoors): Only under specific conditions: an indoor-rated unit, real ventilation, a CO alarm and 1-K fuel. Here is exactly what those conditions are. (Topic: Kerosene. Updated 2026-08-12.) - [Why Energy From Fossil Fuels Is Not Green Energy](https://upfuel.online/blog/is-fossil-fuel-energy-green): Fossil fuel energy fails both green tests: it is non-renewable, and burning it releases carbon dioxide, sulphur dioxide and particulates. (Topic: Fossil Fuels. Updated 2026-08-18.) ## Topics - [Kerosene](https://upfuel.online/topics/kerosene): How kerosene heaters work indoors, which grades burn clean, run costs, wick care and the ventilation they actually need. - [Propane](https://upfuel.online/topics/propane): Indoor-rated propane heaters, oxygen depletion sensors, cylinder rules and why 'indoor safe' never means 'no ventilation'. - [Natural Gas](https://upfuel.online/topics/natural-gas): Flued and flueless natural gas appliances, combustion air, and how mains gas compares with bottled fuels for indoor use. - [Safety & CO](https://upfuel.online/topics/safety): Carbon monoxide, alarms, ventilation math and the failure modes that turn a working heater into a hazard. - [Run Costs](https://upfuel.online/topics/costs): Cost per hour and cost per kWh for every common indoor fuel, with the arithmetic shown so you can redo it at your own prices. - [Buying Guides](https://upfuel.online/topics/buying-guides): What to look for on the spec sheet — BTU ratings, ODS, tip-over cutoffs, certification marks — before you spend money. - [Fuel Science](https://upfuel.online/topics/fuel-science): Calorific value, ignition temperature, combustion products and what actually makes one fuel better than another. - [Fossil Fuels](https://upfuel.online/topics/fossil-fuels): What coal, petroleum and natural gas are, how they formed, why they run out, and which everyday fuels are and are not fossil fuels. - [Cleaner Fuels](https://upfuel.online/topics/clean-fuels): LPG, CNG, biogas, hydrogen and fuel cells — which are genuinely cleaner, by how much, and what the trade-offs are. - [Transport & Industry](https://upfuel.online/topics/transport-fuels): The fuels that move aircraft, rockets, trains and power stations, and why each application picks the fuel it does. - [Fuel Conservation](https://upfuel.online/topics/conservation): Practical ways to cut fuel use at home and on the road, and why alternatives to fossil fuels matter. ## About - [About UpFuel](https://upfuel.online/about): Who writes the site and how guides are researched. - [Editorial policy](https://upfuel.online/editorial-policy): Sourcing, technical review, corrections and independence. ## Optional - [RSS feed](https://upfuel.online/rss.xml) - [Sitemap](https://upfuel.online/sitemap.xml)