Taylor. and some juridictions might want it sleeved. Avoid the risk of burns by keeping them out of the room or choosing another kind of heater. It comes with hardware to mount it to the wall or legs for freestanding applications. BEST OVERALL: Mr. Heater 30,000 BTU Vent Free Natural Gas Heater. In this case, calling an HVAC expert for on-site estimation seems like a good choice. . One BTU is equivalent to about 1/25th of a watt, or the amount of energy required to raise one pound of water by one degree Fahrenheit. These recommendations reflect the importance of having steady, reliable heat in cold temperatures from a trusted power source. The United States is divided into 7 main climate zones or regions.
), Its not required that the burner attaches to the plate/pan. .change .bar2 {opacity: 0;} Most people live somewhere in between and will require around 67,500 BTUs. (72F? You should also consider that the customer may want to add appliances at a later date. Pipe length must include an additional length for all fittings. .category-container { All appliances that use natural gas as a fuel are rated by British Thermal Units or BTUs, a unit of energy measurement. ----- each size. So, the 60,000 BTU furnace is obviously a much more suitable choice than 40,000 BTU. Theyre also known to warm up a room faster and more efficiently than vented heater models. Therefore, if you continuously run your heater, youll consume 1/3 gallon of propane per hour. A 30,000 BTU heater requires one gallon of propane for every three hours. Gas Usage and Pipe Length. All things considered, propane is one of the safer chemicals used for home heating. } If you want to adequately heat the basement, you would need quite a lot of heating output; 30 BTU per sq ft or more. You can set the burner directly on the plate/pan. Therefore, if you continuously run your heater, you'll consume 1/3 gallon of propane per hour. The further the natural gas travels through the piping. The size of your home also affects the size of the gas line you need. BEST BANG FOR THE BUCK: Mr. Heater F232000 MH9BX Buddy Propane Radiant Heater. This vent-free heater comes with the hardware required to mount it to the wall. You can still purchase higher BTU burners without the premium ignition, and we will ship it with a fitting that limits the burner to 65K BTUs in the case that youd like to have it certified. I have to use electric (no gas in to the building). display: block; For example, if you have four appliances and your home is 2000 square feet, you would need a 1/2-inch gas line. Oddly, not one inspector has ever commented negatively on the changes we made and in the last 25 years all I have received is complements on how well I maintain my property. Now, the basic 1500W heaters produce about 5200 BTU of heating output. transform: rotate(45deg) translate(-8px, -8px); In your situation, you should include the basement square footage in the calculation, and you will get a pretty good estimate of how much heating output you need. Ask a contractor or your local gas company for someone qualified to perform an energy audit. Hello Jeremy, you just need a total heating output of 16,700 BTU. BTU stands for British Thermal Unit. This 30,000-BTU blue-flame heater will create warm, even convection heat in spaces up to 1,000 square feet. Its the maximum BTUs per hour. Good luck.
Lets also presume we live in a standard climate (Climate Zone 3). The goal here is to get a rough estimate; a guestimate at best. Theres a battery-powered electronic ignition for easy starts and a low-oxygen cutoff switch that shuts down the unit when it detects dangerously low levels of oxygen. Natural gas is a safe and efficient way to heat your home, but its essential to understand the risks before beginning any project. Thats the Tarantin App. Hello Charlene, that seems like quite a complex sunroom to calculate the heating BTU requirements for. These BTU requirements have, depending on where in the US you live, quite a large interval. margin-top: 18px; Remove the heater and drill the hole for the propane hose. Most metropolitan areas in Canada will require an automatic shutoff for fire pits over 65K BTUs in order to get a permit or certification. Shouldnt it be included in the calculation? In short, no one would bat an eye if you have a 60k furnace in Minessota (1,560 sq ft house, built in 1953 = subpar insulation, to top it off). Our burners and fire features are hand-made in the U.S. and good things take time. This is important because it determines how much natural gas your home needs. If the pressure at the delivery location is much higher than necessary, youll need to lengthen the pipe to allow for it. YouDO NOTneed an air mixer with any of our burners. content: '>'; Step-By-Step Heating, Cooling Explained, How Much Electricity Does A Tankless Water Heater Use? 0000013179 00000 n
Normally yes, however check with your local mechanical inspector to make sure. I burn wood, it smells good! People consider vented propane heaters safer since they divert potentially harmful fumes and noxious gases outside the home. 1301 0 obj
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Overall, our favorites have safety measures in place to ensure safe operation whether they are freestanding gas heaters or mounted on a wall. If your heater had 33,000 BTUs, youd use approximately one gallon of propane per hour. When you turn the heat down, you dont use as much propane. Kerosene cost per gallon can vary quite a bit; lets say $2.00/gallon is the average. This number indicates the amount of energy consumed per hour, not how much it puts out. You may experience unwanted noise and a blowtorch effect, Pressure too Low? This forced-air heater produces 50,000 BTUs of heat, quickly warming garages and small barns up to 1,250 square feet. Those numbers can jump considerably if the space is poorly insulated. If you have multiple appliances connected to the same line. Also, if your home is massive, you might need a more prominent line. Liquid Propane Inlet Pressure: 11.0 in w.c. Pressure Drop: 0.5 in w.c. It depends on what you mean by "flexible pipe". A 500lb tank would provide roughly 358 hours of burn time. 4.5 4.5 out of 5 stars (3,584) $193.04 $ 193. Folks looking to unbox a heater and warm up the space right away might prefer a portable unit that simply screws onto a propane tank. My advice is to do the general estimate first, THEN get an estimate from a service and if the numbers are off significantly, get another estimate from another service and if they are both off, chose one and INTERROGATE that service until all discrepancies make sense to you. I am being told by my family and their HVAC guy, along with EVERY google search, that a 40K BTU unit is well undersized. What about a sunroom with windows on 3 sides and dead air underneath (like a bridge for example)? Im confused by this. Then how do I calculate which size furnace to buy if it is an 80% efficient furnace? Multiply the tank size in pounds by the BTUs in one pound of propane, so 21,500 x 300=6,450,000. Hello Alex, youre 100% correct, the only proper way to account for all the insulation, shapes, exterior wall sizes, and so on, is to consult the Manual J. The issue is that the post is using BTU and BTUh interchangeably which they are not. Im replacing my pellet stove with a freestanding gas fireplace. Is there a chart that will tell us how many BTUS are needed for a 5degree day compared to a 30 degree day in order maintain a set temp of say 70 degrees. 1 BTU is enough heat to raise the temperature of 1 pound of water by 1F. A lot of homes are have rooms with undersized convection. Sizing of Low Pressure Pipes vs. Capacity - Sizing low pressure natural gas pipe lines - Metric units. If the outdoor climate is mild or slightly warm, you may not require as much propane. Some people so you need to add the height of a ceiling into the calculation. All flex lines are stainless steel and whistle free. warm the air around them, starting a cycle of warm air rising and cooler air working its way to the heater. Here are some more details about the different heating methods used in garage heaters: There are other non-electric heaters as well, such as kerosene-burning options. Windows, doors and insulation play a huge role in the final number. In general, the DOE says that lowering the temperature by 1 degree Fahrenheit should reduce the heating bill by about 3%. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Users can position freestanding heaters anywhere theyd like, allowing them to focus heat generation in a particular area. Our mission is to help everyone find the perfect product, whether it is for home improvement or for electronic gadgets. In fact, the cost to heat a propane-fueled home is much less than a home heated by electric heat. 3 baseboard heaters will work as well. 0000023994 00000 n
CTS - Copper Tubing Size. Dyna-Glo BFSS30LPT-2P 30,000 BTU Liquid Propane Blue Flame Thermostatic Vent Free Wall Heater, White 4.5 (309) $25592$270.56 This is why the size of the gas line is so important. Shopping for the best gas garage heater just got a little easier. To adequately determine the heat load needed (in BTU or kW), you should consult a local hands-on HVAC expert; they do special Manual J calculations when it comes to warehouses. After we replaced the windows my Father and I removed the decorative molding, removed the old weights and used blown foam insulation to stop the drafts of cold air. This can be a big benefit, particularly when using a smaller heater in a big space. For natural gas the ratio is usually in the range of 890-1000 BTU/hr per cubic foot of gas. Return the heater to its brackets and slide the hose through the new hole to connect the heater and the propane tank. All of that would have to be scraped out. The size of the fuel conduit, be it copper tubing or pipe, is based on two factors: the thickness of the tubing/pipe and how far the gas must travel to reach the heater. In the cold north, 5,000 BTU will be enough to heat 80 sq ft, and in the hot south, you will be able to heat a 170 sq ft room with such a space heater. DC Wire Gauge Calculator: What Gauge Wire (12V, 24V, 48V)? Hot Water Heater Pressure Relief Valve Keeps Opening. As an Amazon Associate we earn from qualifying purchases. The amount of gas required each hour is determined by the type of appliance you connect to your gas line. 14 Culprits To Check For Now, MMBTU To MMSCFD Calculator For Natural Gas + Chart, 8 Best Infrared Heaters For Indoors, Patios, Garages (With ECO Thermostats), AGM Battery Voltage Charts: 12V, 24V Deep Cycle Battery Voltage, Lead-Acid Battery Voltage Chart For 6V, 12V, 24V, 48V Batteries, Natural Gas MMSCFD To MMBTU/Day Calculator + Chart. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Prices for our products will increase about 3% starting on February 1st. The type of pipe used to transport natural gas is also a factor in determining how much pressure is lost throughout its length. What about ceiling height? Here is a neat table with heating BTUs per square foot for all 7 Climate Zones (check the heating map above with Climate Zones for reference): As you can see, in the north, you need about double the heating output to heat 1 square foot compared to the extreme south. Do not believe any of the posters that will talk about flaking from galvanized pipeThis was an issue with American made years and years ago that has been corrected with much improved quality of pipe and also the natural gas is more pure. Effective May 5, 2021 over 100 Warming Trends CROSSFIRE burners will be approved for use in Massachusetts. Hope this gives you a bit more insight into what temperature to set in your vacant apartment. In the cold north, 5,000 BTU will be enough to heat 80 sq ft, and in the hot south, you will be able to heat a 170 sq ft room with such a space heater. 81% operating efficiency; Natural Gas Example: A burner that requires 374,000 BTU would need a 1" pipe for a 30' long run. Pans (2 or 3 Sidewalls. (1500 Watt), BTU/h To Horsepower Calculator + BTU/h To HP Chart (To 72,000 BTU/h), Horsepower To BTU/Min: Convert HP To BTU Per Minute (Calc + Chart), HP To BTU/hr: Horsepower To BTU For A/C (Calculator + Chart). A joule is the force it takes to move one newton the distance of one meter. } This placement allows the heat to rise and fill the room quickly and evenly. Remedy this by using two tanks connected together, This is a better option for most of our burners from 100K to 200k BTUs, You can always run a larger diameter line and hide the tank in an inconspicuous location, You can purchase 20lb propane tank covers that make hiding the tank a cinch, All of our burners burn with incredible efficiency due to the engineered jets. Get in touch with a professional to determine your pressure at the delivery location. Office of Consumer Affairs and Business Regulation (OCABR), Key Valve/Flex Line Kit (Fk1 or FK2 or FKM1), Push Button Battery Powered (PBIK3.0MBRK), LP Gas Flow is given in thousands of BTU/hr. This vent-free garage heater is simple to install, and thanks to its electronic ignition, its also easy to start. width: 35px; We can play around with the calculations, of course. 0000035842 00000 n
That is just the tip of the iceberg when it comes to trying to deal with governments that want it all.
Take into account times when youre out of the house and dont need heat or overnight when the temperature may drop. - One Cubic foot of LP gas - 2516 BTU This chart refers to low-pressure LP, after regulation. As the host of beloved and groundbreaking TV series, including This Old House and Bob Vilas Home Again, he popularized and became synonymous with do it yourself home improvement. Its important to understand that propane and natural gas heaters are not interchangeable. Stacy Randall is a wife, mother, and freelance writer from NOLA that has always had a love for DIY projects, home organization, and making spaces beautiful. Hello Gary, youre right, the is a very limited number of people that live in Zone 8. And I use my computer there. The company is standing its ground and insisting that the next size up (60K) would be oversized and would be flagged by the city inspector. There are too many factors to adequately quantify the BTUs here; the primary would be insulation (R-Values). But you might be struggling to figure out what kind of paint to use on garage walls. 1 Cubic Foot (CF) = approx 1000 BTUs; . Get the Mr. Heater Buddy gas garage heater at Amazon, The Home Depot, or Lowes. I know there are many old homes that use a lot of energy. } I need to heat an open rectangular room up to 120 F. Dimensions are 42 x 12 x 9(ceiling), total 504 sq. Copyright 2023 Tarantin, All Rights Reserved. Furthermore, we narrowed our search to include the three heating methods: forced air, convection, and radiant. The reason for this has to do with several things including pipe size, total service line distance and appliance BTU demand. The length of the pipe determines the pressure delivered to the heater at the moment of delivery. Recessing it to be more shallow can give it a proud look; where all the parts stick up high and make a statement. Heres a look at a basic install for a vent-free wall heater that can work with either liquid propane or natural gas. -webkit-transform: rotate(45deg) translate(-8px, -8px); That is because of all of the ordinances that mandate that we use appropriately sized (3 was the old standard) wooden cladding. If you have a lot of appliances that use natural gas, you might need a more extensive line. Then follow the below step to determine the Gas Line Size for the 30000 BTU heater: What Size Gas Line For 80,000 BTU Furnace? W2 Wire Thermostat Wiring (2nd Stage), Thermostat Wire Color Codes For 3-8 Wire Thermostats (Color-By-Color), How Many Therms Of Gas Per Month Is Normal? That means that, instead of 20 BTU per sq ft for 8 ft ceiling height, we need to use 52.5 BTU per sq ft. Thats 7,800 sq ft 52.5 BTU/sq ft = 409,500 BTU or, if we convert these BTU to kW with this calculator, 120 kW. Burning that extra fuel is bad news for both your wallet and the environment. 0000007488 00000 n
Most center around a burn or fire risk. Get free, zero-commitment quotes from pro contractors near you. What Size Pressure Relief Valve For Water Heater? I would run soft copper for propane, flared ends of course. If a home already has a natural gas supply, natural gas garage heaters are a great way to add heat. These are: To help you get some answers, we have calculated two heating BTUs tables for each question: Using the BTU heating calculator, we can estimate how much heating output you require to heat a home with certain square footage. Try reasoning with a city council that has no knowledge of construction and believes that all landlords are wealthy. Now, if you use kerosene and would like to estimate your heating costs, heres a way how you can do that: 1 gallon of kerosene contains 131,890 BTUs of energy. This portable garage heaters ventless design means it can be used indoors or out, and the near-100 percent efficiency means it wont waste precious fuel. Each method has a different kind of heat output in the room that some find more effective than others. just type in loudepot in any APP store, and for .99 cen. To determine how much burn time you can get from your propane tank, use this simple formula. It also acts like the hood of a car, in that it can be lifted up and out in order to access the gas line or key valve underneath. Will you still get great flames? Regardless, youll likely be able to save on whole-house heating costs by using a propane wall heater to warm an area. It will require a 75,000 BTU input since it is 80% efficient. ), Drop-In Pans (2 or 3 Sidewalls + 1-2 Lip). For example, an L shaped home will have the same heating load as a square shaped home but the square shaped home has 33% more internal sq footage. In this climate zone, you will need about 40 BTU to heat 1 sq ft of space. Heating a small space doesnt require a big budget. On the other hand, if your home is smaller, you might get away with a smaller line. (std. What Size Gas Line For 30000 BTU Heater You will need a 3/8-inch gas line for your 30000 BTU heater. .bar1, .bar2, .bar3 { 30,000 BTU Radiant Vent Free Heater for use with natural gas. You should mount them near the baseboards since the gas sinks instead of rising. Its helpful to check the manufacturers use and installation instructions. The average propane heaters capacity is 40 BTUs per square foot. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Hello George, we can usually tolerate lower temperatures in the basement as in the living spaces. (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? } 0000024838 00000 n
text-align: left; routing the Gas Connection Lines depending on where. This field is for validation purposes and should be left unchanged. Pressure too High? The cost to operate a propane wall heater is about $0.80 per hour. ft. display: inline-block; Check to see if theres an answer to your question below. It is better to have a gas line that is too big than too small. Given all the different options available for heaters -- space, vented, gas, console, and more -- narrowing down the choices can be a great way to ensure that you are choosing the best option. A Therm of natural gas will keep a 30,000 Btu wall heater running for 3.3 hours. It is important when installing a gas line that you size it correctly for the application. This is primarily for living spaces; warehouses tend to have not-as-good insulation (lower insulation R-values), high ceilings (plenty of air to heat) and usually dont need to be heated up to 72F. However, if they decide to use a flexible line, most lines are 36 long, so it makes sense to try and keep the gas stub within 36 from the key valve location, Instruct the contractor to keep the gas stub as low as possible to make room for electronic ignition, or in the case that the plate sets fairly low, On some builds, the plate sits only 8 off the ground, For optimal regulation for burners over 250K BTUs, contact a local propane supplier, For regulators 250K BTUs or lower, purchase our, From the tank, propane is HIGH PRESSURE, so it must be regulated down, because the burners are low pressure, For longer gas lines, we often use a high pressure (10psi) regulator at the tank end, and a 2nd stage regulator on the other end of the line to bring the pressure to 11-13wc, A standard 20lb/5 gallon BBQ propane tank can be used for burner systems 180K BTUs and under, Burn time varies from 6-12 hours, depending on how hot you run it, Results may vary, and it is common for the fuel to freeze up with burners 180K BTUs and up. My house has 22 windows most of which are 60 tall, and they are mostly facing south so there is that heat gain in the winter on sunny days. In general it is common to set. 30000-BTU Floor-Mount Indoor/Outdoor Liquid Propane Convection Heater Model # 124681 Find My Store for pricing and availability Mr. Heater 50000-BTU Wall-Mount Indoor Natural Gas or Liquid Propane Radiant Heater Model # F260550 Find My Store for pricing and availability Mr. Heater 18000-BTU Floor-Mount Indoor/Outdoor Liquid Propane Radiant Heater There are various pros/cons of Liquid Propane (LP) and Natural Gas (NG). This chart refers to low-pressure LP, after regulation. With that being said, there are a number of factors that may alter that number. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? The nominal diameter is the pipes external diameter, which in this case is 3/8 inch. That would yield a heat load of 46,800 BTU minimum. Besides, a 30,000 BTU propane heater is equivalent to a 9,000-watt electric heater. Used the calculator to determine that i need 101,250 btus required heating output in winter. Water Columnis the term used to measure pressure. Its important to note that some heating methods are not appropriate for small, poorly ventilated spaces, which is why we have both natural gas and propane garage heaters available for specific needs. This might be beneficial if you want to cover your fire feature with a flat cover, Consider stacking up cinder blocks, bricks, or pavers inside the fire feature cavity, Place the plate/pan directly on the blocks, Adjust the block height by either adding some fill, or by digging underneath, 4-5 below the finished top is recommended, Recessing it deeper may make the fire seem smaller, and you wont see the media as well. Also, adjust the temperature to keep your home comfortable and your heating bills low. Also, a 30,000 Btu heater will consume 1 cubic foot of natural gas per hour. Not arguing your point here, but the web page is only giving consumers a rough estimate, which is the best anyone can do on their own before taking your advice to get a more accurate calculation by a service which unfortunately are not always honest. We store towels, medicine, toiletry supplies, first-aid gear, massage devices, facial steamers, spare Painting your garage is a great way to improve the look of the space and make the walls easier to clean. } To confirm the approval of a product, simply: Click Find Products and see the listing of accepted products. There are products that work for both large 2-car garages and small work sheds or even campers. This makes ventilation more important. BTU or British Thermal Unit is a unit of heat. If, down the road, you need to convert from LP to NG or vice-versa, you can do so by purchasing replacement jets from us at $25 each. Using this formula, you can determine that your 300-pound propane tank will last for approximately 215 hours of burn time. Tom is also an avid racing and baseball fan. For example, in a 250 square foot apartment, a 10,000 BTU heater would be sufficient. The lower the pressure will be by the time it reaches its destination. Hope this helps. Gas Pipe Line Calculation Sizing USING CPC PIPE SIZING TABLE (PROPANE) . Can I simply just put a solid piece of Threaded 3/4" black pipe through the wall and use a flexible pipe from there to the wall heater? These options can heat small or large garages and are either portable or wall-mounted. Screw the brackets into the wall, ensuring proper spacing to hang the appliance. 0000001494 00000 n
They mix fuel and oxygen at the flame which makes it taller, brighter, and hotter using less fuel, Read all about how much fuel you might be burning at full capacity , ANSI Z21.97/CSA 2.41 Outdoor Decorative Gas Appliances, The burner system is certified nationally, however, it is up to the customer or contractor to verify local requirements, Select Product Information from the drop down, then click Go., Model Number: Enter the burner type and BTU output (i.e. .change .category-container { Setting the thermostat to a preferred temperature will ensure the heater kicks on and off, maintaining that temperature within the space. The UDX-30 has a 30,000 BTU output, while the UDX-45 is good for up to 45,000 BTU. This makes for a simple and sturdy plate mount, If the top of your fire table overlaps, or encroaches into your opening, and its thickness is less than 3 inches, you may want a pan instead of a plate (since the pan has to be smaller than the smallest part of the inside diameter), The sidewalls help contain the fire media/lava rock, Sometimes necessary if you plan on building a portable fire feature and arent able to stack up blocks under the plate, Bar-height or uncommon builds might benefit from a drop-in pan, You will see a brushed aluminum metal band on the top of your fire feature when you use a drop in pan, Drop-in pans are available as a custom order , We recommend 3 sidewalls with a 1.5 lip in most cases, When you order a package from us, most of the time it will come with a threaded piece welded on to the plate/pan, Its very simple to remove or attach the burner (righty-tighty, lefty-loosy make sure to re-apply pipe dope/tape! I have nothing else I'm using gas for and I want to keep this as simple as possible. I would use galvanized thru the wall to the exterior. This will reduce the height of the burner by 3/4. In order for natural gas heaters to function correctly, the fuel line must be able to accommodate the amount of gas needed to run efficiently. Take into account times when youre out of the house and dont need heat or overnight when the temperature may drop. print Print. 0000064685 00000 n
This means that a 30,000 BTU heater connected to a 3/8-inch pipe that is 80 feet long would need a regulator set at 11 inches of water column (WC) to keep the gas flowing correctly. After some basic calculations, youll be able to determine how much propane is required to operate your particular unit. The three main types of gas garage heaters are forced air, convection, and radiant. The propane company said they usually just hook up to a 3/4" black pipe on the exterior. If you have a lot of devices that use natural gas, you will need a more significant gas line. To produce that output, the furnace will need a larger than 60,000 BTU input (since no gas furnace is 100% efficient). This is the normalpressurethat household naturalgasis delivered. What that means is that after 45 minutes or so, the flame only goes to about half. Note the energy content of the fuel. I avoid CCST at all costs. Furnace for a 1,560 sq. This unit accepts small 1-pound bottles of propane, though an adapter hose will hook it to a standard-size propane tank. or 1/2'' Black Pipe . Additionally, these heaters come in two variations: direct vent and ventless. I replaced the heating units in each apartment with Rinnai gas heaters that at that time were the most energy efficient. A natural gas supply burns cleanly, and an abundant amount is available. Example: Miami, Florida, is in Climate Zone 2 and requires 35 BTU of heat per sq ft. Chicago, Illinois, is in Climate Zone 5 and requires 50 BTUs of heat per square foot. To calculate how much propane an appliance will consume per hour, follow these steps: So, one gallon of propane fuel will power a 30,000 BTU heater for about three hours. For a rough estimate, utilize our gas line sizing charts below. That is a rich one. Tankless Water Heater Breaker Size Calculator: What Size Breaker? We believe that every guy deserves to have the perfect size for whatever he is using. As far as we know, however, it doesnt exist. In a standard climate, 40,000 BTU is enough to heat a 1,000 sq ft area. understand how to run proper size gas lines, to accomidate the necessary BTU, Like these videos? Its also advisable to mount a carbon monoxide detector in each room with a propane heater. 0000036125 00000 n
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You would need 101,250 BTU or 101,250 BTU / 131,890 BTU = 0.77 gallon of kerosene or $1.44 per hour maximum. I need to install the supply line directly through the exterior wall underneath the heater to the outside. The nozzles or jets that supply gas to the flame on each type of heater are differently sized, and you wouldnt want to use a propane tank, for example, on a natural gas heater without a conversion kit. A garage heater can be an excellent addition to a home, but not everyone is entirely familiar with them. RELATED SEARCHES. Use our free heating BTU calculator! Question: How many BTUs do I need to heat 1500 sq ft? Practically, that is way more than what you actually need. Dyna-Glo wall heaters are the ideal choice for safe, indoor supplemental heating. .container-menu { How Many Square Feet Will 40,000 BTU Heat? Example: A 60,000 BTU 80% efficient (80 AFUE) furnace will produce 60,000 BTU output. What everybody should bat an eye at is 40k furnace for this house.