natural gas btu calculator

Free time to spend with your family and friends. Jan 2023 Heating Costs Update: Due to unprecedented recent increase in cost of all heating fuel types, average cost of Natural Gas has increased by as much as $0.50 per Therm, Heating Oil is around $5/gallon & Propane has gone up by $0.90/gallon. DC Wire Gauge Calculator: What Gauge Wire (12V, 24V, 48V)? What Is Mbh for Furnace (Convert Mbh to Btu). You also can convert 1 Cubic Foot Of Natural Gas to other energy units. 10 British Thermal Units to Cubic Feet Of Natural Gas = 0.01. %. SG = particular gravity of herbal gasoline For herbal gasoline the nominal BTU/cf varies from approximately 900 to 1100 BTU/cf. Volumetrically, propane is energy-richer fuel than natural gas. The best way to think about this factor is for us to describe each option: First, the home was built after 2010, and youre sure it has a wrap like Tyvek or similar. Generator Size (kW) WebThe British Thermal Unit, or BTU, is an energy unit. You can use it to answer the common questions like: At some point, depending on the climate, you have to begin to think about more than one heating device furnace, boiler, heat pump, etc., for your home. Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm. These include: These would all do the same thing: convert between various units of measuring natural gas. WebBTU Calculator A BTU or British thermal unit is a unit of energy. *The fuel content of the volume of natural gas can vary. The conversion factor between cubic feet and cubic meters is: The conversion between the BTU and ft is based on: The steps to convert from ft3 to BTU are: BTU stands for British Thermal Units. The BTU content in solid fuel on the other hand can vary widely. It is a unit to measure the heat energy produced by fuels, in 4. In general it is common to set. Do they make furnaces that size? WebHow to use Kohler's Home Generator Sizing Calculator. Insulation: There are two keys to insulation How well your home is sealed and the type and thickness of the insulation. What if I live near the edge of a zone? Cost of electricity has gone up by $0.02 $0.13 per kWh. Web1 Cubic Foot of Natural Gas: 1000 BTU IT: 1 British Thermal Unit (International Table): Most common use of term BTU in everyday language. Ethane,C 2 H 6. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2014-2023, PICKHVAC All Rights Reserved. The units to measure natural gas in terms of heat and energy generation are: If you come from a "metric" country, you'd likely be familiar only with the Joule: visit our energy conversion calculator to orient yourself with these different and more specific measurement units. If it is unheated, then dont. Google use cookies for serving our ads and handling visitor statistics. Webenergy content in natural gas 1000 Btu/ft 3 (37.26 MJ/m 3) steel pipes schedule 40; For natural gas the nominal BTU/ft 3 varies from about 900 to 1100 BTU/ft 3. 1 ft3 = 1,039 BTU The steps to convert from ft 3 to BTU are: Note down the quantity in ft 3; Multiply it by 1,039; and The result is the quantity in BTU. WebSG = specific gravity of natural gas. Make sure only one gas appliance is on and keep an eye on the gas meter to see how long it takes to utilize one cubic foot of gas. The calculator will automatically convert your number and display the result in the other unit fields. Climate Zone: Find your location on the map.Pro tip: If youre on or near the border between Zones, choose the higher number/cooler Zone. Our cubic feet calculator has the answer! Q: What size furnace do I need for a 2000 sq ft home? A 100,000 to 160,000-plus BTU furnace. Try to place the air conditioner condenser on the shadiest side of the house (typically north or east). On average, this represents Thats an important question to get a right answer to. WebThis Natural Gas conversion calculator is a unit conversion tool dedicated to the units used in measuring natural gas. WebSG = specific gravity of natural gas. Convert emissions or energy data into concrete terms you can understand such as the annual CO 2 emissions of cars, households, and power plants.. 800 British Thermal Units to Cubic Feet Of Natural Gas = 0.8. A totally exposed home in northern Michigan will get less warmth from the sun in winter, because winters are cloudy there, than a partially exposed home will get in Minnesota where there are many more days of winter sun. Thats a wide difference, essential one furnace being twice as large as the other, so the size factors are discussed to help you narrow down the right BTUs needed for your home. 9 British Thermal Units to Cubic Feet Of Natural Gas = 0.009. So, use the calculator and input different efficiency ratings based on the furnaces you might be considering. We assumed 102,000 Btu/CCF in our calculations. For example, 600 CFH of natural gas is equal to 622,200 BTU. 600 British Thermal Units to Cubic Feet Of Natural Gas = 0.6. All you have to do is enter the quantity in the unit of your choice and make sure you select the proper unit for the output. You may be trying to access this site from a secured browser on the server. WebThe calculator provides indicative conversion of gas consumption in cubic metres to kilowatt-hours and other units. SG = particular gravity of herbal gasoline For herbal gasoline the nominal BTU/cf varies from approximately 900 to 1100 BTU/cf. Further on, you will also find calculated conversion charts for CFH to BTU for both fuels: Here you just insert the CFH of natural gas, and the calculator will automatically convert that volumetric flow to BTUs: Here is how you can use this calculator to convert cubic feet of natural gas per hour to BTU: Lets say that your home meter reads 85 CFH. WebThis page features online conversion from normal cubic meter of natural gas to British Thermal Unit.These units belong to different measurement systems. A BTU describes the energy content or heat value of fuels. The specific gravity of natural gas varies from 0.55 to 1.0. Multiply each components percentage by its heating value to find the total heating value of the natural gas sample. If you need to convert normal cubic meter of natural gas to another compatible unit, please pick the WebNatural gas conversion calculator cubic feet Btu megajoules cubic meters 1 cubic foot = 1,039 Btu ( based on U.S. average for natural gas delivered to consumers in 2021, preliminary) Crude oil conversion calculator barrels Btu megajoules liters 1 barrel = 42 U.S. gallons = 5,691,000 Btu ( based on U.S. production in 2021, preliminary) Did you Know? Carbon dioxide emissions per therm are determined by converting million British thermal units (mmbtu) to therms, then multiplying the carbon coefficient times the fraction oxidized times the ratio of the Climate Zone: Find your location on the map.Pro tip: If youre on or near the border between Zones, choose the higher number/cooler Zone. If your home is surrounded by tall trees that shade the walls and the roof and few are then choose Heavily shaded. The flow of natural gas and propane is sometimes expressed in CFHs (Cubic Feet per Hour). Again, for the most accurate results, use the Pick HVAC Furnace Sizing Calculator. Slide the slider to 85 and you get the result automatically: 85 CFM of natural gas is equal to 88,145 BTU. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! In general it is common to set. Energy Conversion Calculator. 600 British Thermal Units to Cubic Feet Of Natural Gas = 0.6. Most homes, in this regard, are either Average or Very Sunny. Take a look at the choices available in our tool there's way more options to choose from than what's mentioned above. A darker surface absorbs more radiant energy than a lighter one. Example: With 75,000 BTU heater, you can heat a 2,500 sq ft house in Florida. Since the energy in natural gas is equivalent to the gas's volume, you can freely convert between BTUs per hour and cubic feet per minute (CFM). Its a wide range. The smallest gas furnaces start at about 30,000 BTU per hour, or BTU/h. You might also want to consider this question: How much sun does your climate get? If you need to convert standard cubic foot of natural gas to another compatible unit, please pick the Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm. Natural Gas - Pipe Sizing Calculator - Calculate capacities and dimensions of natural gas pipe lines. WebCFH to BTU Calculator for natural gas, accompanied by a Natural Gas CFH To BTU Chart converting flows from 1 CFH to 1000 CFH to BTUs (1037 BTU to 1,037,000 263+ PhD Experts 3 Years in business Energy Conversion Calculator. If you like it toasty inside, use the warmer zone (lower number). Conversion table. Is the furnace youre considering listed by input or output? Solve Now. For example: 85% x 1,031 = 876 + 10% x 1,075 = 108 + 3% x 1 ,265 = 38 + 2% x 2 , 488 = 100 4. WebFor 1 m 3 of natural gas, you would multiply by 1 m 3 by 0.0353, which would give you 0.0353 MMBtu. Turn off more accessible mode. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. Thermal resistance, which is a measure of a material's resistance to heat flow, is indicated by a material's R-value. The largest gas furnaces create about 140,000 BTU/h. Any home or room may be subject to dead spots, or specific areas of improper airflow. Your house was built in 2005 with a good insulation. Specific gravity of natural gas is set to 0.60. How Many Square Feet Will 30,000 120,000 BTU Furnace Heat? Wood Furnace/Boiler Reviews and Buying Guide. If you still dont know how to figure btu for furnace, just leave a comment below. To use the calculator, place your cursor in the desired unit field and write a number. WebWith our smart calculator you can easily convert between the two weight units thmand BTU. 1 BTU = 0.293 watt hours; 100,000 BTU = 1 therm; 3,413 BTU = 1 kilowatt hour; Common BTU ratings. Decreasing efficiency over the life of the heater or air conditioner. This can be the back corner of the living room behind a couch, the bathroom with no vent and a big window, or the laundry room. Find out how many seconds are equal to an amount of time in hours using our hours to seconds converter. >Use the Pick HVAC Gas Furnace Sizing Calculator for most accurate results. Natural gas has roughly 1,050 BTUs per cubic foot (0.028 cubic meters). See our Wood Furnace/Boiler Reviews and Buying Guide for details. The answer is in the documents, often a PDF file that lists Input and Output in separate columns. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Conversion table. Use the Pick HVAC Gas Furnace Sizing Calculator, and when you get estimates from furnace contractors in your area, youll have a very clear understanding of what to expect. WebThe calculator provides indicative conversion of gas consumption in cubic metres to kilowatt-hours and other units. Since the energy in natural gas is equivalent to the gas's volume, you can freely convert between BTUs per hour and cubic feet per minute (CFM). 200,000 BTU is equal to 192.86 CF of natural gas. Ethane,C 2 H 6. Typical values are in the range 0.6 - 0.7. Ethane,C 2 H 6. Contact us at 877-847-0050 or email sales@TotalHomeSupply.com Total Home Supply Turn on more accessible mode. Web1 Cubic Foot of Natural Gas: 1000 BTU IT: 1 British Thermal Unit (International Table): Most common use of term BTU in everyday language. WebCFH to BTU Calculator for natural gas, accompanied by a Natural Gas CFH To BTU Chart converting flows from 1 CFH to 1000 CFH to BTUs (1037 BTU to 1,037,000 263+ PhD Experts 3 Years in business Energy Conversion Calculator. This chart begins small space heater size, not furnace size and progresses to homes in the average to large size category. We may or may not be compensated for purchased you make as a result of our recommendation. Home Size: Enter the square footage of your home. Many large homes, especially where winters are cold, have two furnaces. Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. So, what is the answer? Lets start with this very useful map. Add all of the products together to find the total heating value of natural gas as 876 + 108 + 38 + 100 = 1120 Btu/scf. Approximately 1.05505585262 x 10 3 1 1 m 10,55 kWh 0,01055 MWh. Climate Zone: Find your location on the map.Pro tip: If youre on or near the border between Zones, choose the higher number/cooler Zone. 1 ft 0.028 m, 1 m 35.315 ft. WebFUEL QUALITY CALCULATOR. Convert emissions or energy data into concrete terms you can understand such as the annual CO 2 emissions of cars, households, and power plants.. Homeowners tend to think in terms of output how many BTUs do I need for a warm house on the coldest day of winter? If you dont know it, the information might be found on a blueprint or house drawing, in closing Both factors make a difference that a simple size/climate gas furnace size calculator doesnt consider. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! The second half of that sentence is a mouthful wood-burning combi boilers heat water but that hot water doesnt flow directly into your hot water pipes. It is sold or purchased in terms of the required volume. Pressure are approximate for hose length up to 25 feet; increase for longer lengths about 3 PSIG per 25 feet and increase working pressures 2-3 PSIG for check valves. Calculate heating BTU needed in four easy steps. *The fuel content of the volume of natural gas can vary. The maximum allowable BTU/Hr will be visible where the two lines intersect. That is because 1 CFH of propane contains 2517 BTU, according to Inspectapedia. Secondly, if you have an older home, but you have added attic insulation, replaced the windows and/or doors in the last 15 years with energy-efficient units and perhaps even added house wrap during a siding project, then the insulation quality would be considered Good. Natural gas is a significant industrial and domestic fuel. Multiply that by 100,000 to get the price per hour youll pay to run the furnace: about 87 cents. For example, if youre trying to heat 1000 square feet in a cold climate, 30,000 - 40,000 BTUs will add significant warm air to your home. And for heat pumps, it is the same as for air conditioners the amount of heat moved from outside to inside during heating. WebThe British Thermal Unit, or BTU, is an energy unit. WebIf the price for natural gas is based on $ per 1,000 cubic feet, divide that number by 10 to enter above. WebBtu to cfh conversion natural gas calculator. Thermal insulation is defined as the reduction of heat transfer between objects in thermal contact or in the range of radiative influence. These applications will - due to browser restrictions - send data between your browser and our server. BTU as a unit of measurement is more useful than physical quantity because of fuel's intrinsic value as an energy source. In a cubic meter or foot of natural gas, how many BTUs are there? Divide the energy transfer rate in BTUs per hour by 100,000, which is the number of BTUs in a therm. For most consumers in Canada, theres a natural gas meter on the outside Please enable scripts and reload this page. Consider a six-sided home. as the decimal separator. Thats 1,500 square feet. Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. As a general rule of thumb, a temperature between 70 and 80F is a comfortable temperature for most people. Computing BTUH: Technical Note: You can calculate your gas-fired equipments BTUs per hour of gas usage. It will vary due to the material, sill of the operator in the working conditions. Poor:Your home is older, and its a little drafty around windows and doors. WebPlease note that this table is intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed. NG Default Clear Form. Ceiling fan usage. And in cold climates multiply the square foot number by 30 - 40. A simple rectangle is easiest. The following is a rough estimation of the cooling capacity a cooling system would need to effectively cool a room/house based only on the square footage of the room/house, as provided by EnergyStar.gov. For instance, heating a home in Alaska during winter, or cooling a home during a Houston summer will require more BTUs than heating or cooling a home in Honolulu, where temperatures tend to stay around 80F year-round. This furnace size calculator uses your house size, climate (see the map below) and other important information to tell you what size furnace your home needs to keep it warm without wasting energy. It is now code, so if your home doesnt have it, vapor barrier/wrap will have to be installed the next time you replace the siding. Use the content above to get the most accurate gas furnace sizing calculator available anywhere. Otherwise, stick with Zone 3. There are other units that measure the energy and heat generation of fuels, such as joules and therms. A 100,000 to 160,000-plus BTU furnace. The calculator will automatically convert your number and display the result in the other unit fields. WebThis page features online conversion from standard cubic foot of natural gas to British Thermal Unit.These units belong to different measurement systems. 1 m 10,55 kWh 0,01055 MWh. Approximately 1.05505585262 x 10 3 It is based on the needed heating BTU per square foot for most homes and your climate. If one MCF costs $9.00: Divide the price per MCF by 1,028,000 to get the price per BTU: $0.00000875486. This is straightforward. Our natural gas converter is a unique but swiftly straightforward tool. Most top brands Carrier, Trane, Lennox, Rheemand all the others, make furnaces with heating capacities of 40,000 or 50,000 BTUs on the low end to 120,000 to 140,000 BTUs on the upper end. Our results are the easiest to understandbecause we list them by the furnace AFUE you choose and the number of BTUs required for your home. Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm. But if you live in very south, it can heat more than 1,000 sq ft. A BTU is a measurement of heat specifically, the heat needed to raise the temperature of one pound of water 1 degree Fahrenheit. Choose your length and size from the drop down menus below. Methane, CH 4. You may be trying to access this site from a secured browser on the server. Energy required to raise the temperature of 1lb of water by 1F. Home Size: Enter the square footage of your home. 1 cu ft nat gas = 995.33571001887 BTU. Please enable scripts and reload this page. Webenergy content in natural gas 1000 Btu/ft 3 (37.26 MJ/m 3) steel pipes schedule 40; For natural gas the nominal BTU/ft 3 varies from about 900 to 1100 BTU/ft 3. How many BTU do I need for a 2,000 square foot home? The BTU content in solid fuel on the other hand can vary widely. WebPlease note that this table is intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed. Use the calculator, or for a quick answer, see the examples below that answer common questions like: We take the size, climate and insulation value, and give you the most accurate furnace btu calculation results youll find online. 80% furnace:80% of the heat is transferred into ductwork while 20% is wasted out the exhaust vent. wood cord. The units that measure the volume of natural gas are cubic feet, hundred cubic feet, thousand cubic feet, million cubic feet, and so on. It was developed by the International Code Council / International Energy Conservation Code and adopted by the US Department of Energys Office of Energy Efficiency & Renewable Energy. BTU stands for British Thermal Units. For example, if you need 94,000 BTUs to heat your home, your choices, depending on the furnace brand, might be 90,000, 96,000 or 100,000 BTUs. It is possible to try and place shady trees around the condenser, but keep in mind that condensers also require good surrounding airflow for best efficiency. We mention that to represent it as accurate and very useful for our purposes. air). WebConvert 1 Cubic Foot Of Natural Gas to BTU (cu ft nat gas to BTU) with our conversion calculator and conversion tables. How much is this quantity in meters? NG Default Clear Form. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Heating Annual Cost Calculator: Oil vs Gas vs Propane vs Electric 2023, Propane VS Electric Heat Calculator (Running Cost & Savings Comparison), kW To BTU Converter Calculator: How Many BTU in a kW. About Us | Contact Us | Privacy Policy| Cookie Policy| Terms of Use| Do Not Sell My Info. The importance of insulation lies in its ability to lower BTU usage by managing the loss of heat due to its entropic nature heat tends to flow from areas of warmer air to cooler air until there is no longer a difference in temperature between the adjacent areas. To help you out we have created two useful resources for this: The energy density (BTUs per CFH) for natural gas and propane are not the same; hence 2 calculators and 2 charts. Cost of electricity has gone up by $0.02 $0.13 per kWh. Decide mathematic question. You can get more accurate answers thourgh our BTU heating calculator. 1. 95% furnace:95% of heat is transferred, and 5% is lost. Even dirty white roofs (with noticeably darker shades) compared to newer, cleaner surfaces, can result in noticeable differences. The downstream pressure in a houseline after the meter/regulator is in general in the range of 7 to 11 inches Water Column, or about 1/4 psi. WebJust insert the BTUs in the equation, and you can calculate the number of cubic feet of natural gas that contains 200,000 BTU of heat content like this: Cubic Feet (200,000 BTU) = 200,000 BTU / 1037 = 192.86 Cubic Feet Of Natural Gas. 10 British Thermal Units to Cubic Feet Of Natural Gas = 0.01. The smaller furnace would adequately heat your home on all but the coldest days, but it still makes sense to ensure your home is cozy every day of a cold winter. Therefore, consider the map below. Web500 British Thermal Units to Cubic Feet Of Natural Gas = 0.5. WebIf the price for natural gas is based on $ per 1,000 cubic feet, divide that number by 10 to enter above. The British Thermal Unit, or BTU, is an energy unit. A long narrow house has more walls than a square house with the same square footage, which means heat loss. No Not for residential use. Use the content above to get the most accurate gas furnace sizing calculator available anywhere. Jan 2023 Heating Costs Update: Due to unprecedented recent increase in cost of all heating fuel types, average cost of Natural Gas has increased by as much as $0.50 per Therm, Heating Oil is around $5/gallon & Propane has gone up by $0.90/gallon. Generator Size (kW) If you answer yes to the house wrap and window/doors questions, then choose Good or Average in the Insulation box. These are quick answers. Similarly, to calculate BTU from the CFH of propane, we have to multiply CFHs by 2517. Boilers: 100,000 - 200,000 BTUs/hr* WebWith our smart calculator you can easily convert between the two weight units thmand BTU. Propane, C 3 H 8. Pretty simple. How to use it? How Many Square Feet Will 4,000 80,000 BTU Heat? %. 800 British Thermal Units to Cubic Feet Of Natural Gas = 0.8. Plus, we give you an estimated furnace sizebecause manufacturers produce furnaces in increments of 10,000 to 20,000 BTU. Atlanta winters tend to hover around 45F and temperatures may fall as low as 30F occasionally. 1 Cubic Foot (CF) = approx 1000 BTUs; 1 CFH = 1 MBH; The specific gravity of natural gas varies from 0.55 to 1.0. Secondly A method that also yields an accurate calculation is to measure the footprint of your home. PickHVAC is also a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Only emails and answers are saved in our archive. You may be trying to access this site from a secured browser on the server. >Use this Furnace Sizing Tableto check your results compared with the most common results. WebHow to calculate the BTU capacity of LP or natural gas fired equipment, heaters, or appliances. This allows many different commodities with intrinsic energy properties, such as natural gas and oil, to be compared and contrasted. Sample Name: All values should be entered as mole %, unless otherwise noted. You also can convert 1 Cubic Foot Of Natural Gas to other energy units. If you already bought a specific size space heater or furnace and want to know the square footage it can heat, here are the quick answers: For example, a 30,000 BTU space heater will heat 1,000 square feet in Florida, which is in hot climate. To get this number in units of BTU, you would multiply it by 1000000, which would give you a total of 35300 BTU in an m 3 of gas. For example, if the cost for natural gas is $17.50 per 1,000 cubic feet, then divide by 10 and enter 1.75 as the price per therm. If one MCF costs $9.00: Divide the price per MCF by 1,028,000 to get the price per BTU: $0.00000875486. We rely on readers like you to share your HVAC system cost or quote. (State-By-State Chart), How To Convert Therms To kWh? Check out our ft to m converter for help converting from feet to meters. ** Enter the price of electricity in dollars. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. 200,000 BTU is equal to 192.86 CF of natural gas. The deeper the color, the more sunny the climate. For example, a home owner in Atlanta might want to determine their BTU usage during winter. Note Input: 60,000 120,000 BTU/h If you look at the PDF document, you see that there are four models 60,000, 80,000, 100,000 and 120,000 BTUs Input. WebThis Natural Gas conversion calculator is a unit conversion tool dedicated to the units used in measuring natural gas. explains how BTUs apply to air conditioners and, to some extent, heat pumps. Just slider the slider to 175 and you get the result: 175 CFH of propane is equal to 440,475 BTU. For instance, you might enter 2,600joules2,600 \text { joules}2,600joules and select BTU\text{BTU}BTU to convert to. Decide mathematic question. 200,000 BTU is equal to 192.86 CF of natural gas. Shortly: it shows how much energy (in megajoule) is released while combusting 1 cubic meter of natural gas. Jan 2023 Heating Costs Update: Due to unprecedented recent increase in cost of all heating fuel types, average cost of Natural Gas has increased by as much as $0.50 per Therm, Heating Oil is around $5/gallon & Propane has gone up by $0.90/gallon. To convert 1 cu ft nat gas to BTU use direct conversion formula below. WebBtu to cfh conversion natural gas calculator. A furnace or space heater that is too small wont adequately heat your home on the coldest winter days. Our natural gas converter is a unique tool that let you convert between different units of measuring natural gas. WebGas calculator - equation Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm Conversion table 1 BTU = 0.293 watt hours 100,000 BTU = 1 therm 3,413 BTU = 1 kilowatt hour Common BTU ratings Boilers: 100,000 - 200,000 BTUs/hr*