BTU Calculator<\/title>\n <style>\n #btu-calculator {\n font-family: Inter, sans-serif;\n }\n\n #btu-calculator .calculator {\n background: white !important;\n padding: 30px 40px !important;\n border-radius: 12px !important;\n box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1) !important;\n max-width: 500px !important;\n margin: 0 auto !important;\n }\n\n #btu-calculator h1, #btu-calculator h3 {\n color: #dd823b !important;\n margin-bottom: 20px !important;\n text-align: center !important;\n }\n \n #btu-calculator fieldset legend {\n margin-bottom: 0px !important;\n }\n\n #btu-calculator label {\n display: block !important;\n margin-top: 12px !important;\n color: #444 !important;\n }\n\n #btu-calculator label > span,\n #btu-calculator label > input,\n #btu-calculator label > select {\n display: block !important;\n width: 100% !important;\n }\n\n #btu-calculator input[type=\"number\"],\n #btu-calculator select {\n padding: 8px 10px !important;\n font-size: 16px !important;\n margin-top: 4px !important;\n border: 1px solid #ccc !important;\n border-radius: 6px !important;\n }\n \n #btu-calculator input:disabled {\n background-color: #eee !important;\n cursor: not-allowed !important;\n }\n\n #btu-calculator fieldset {\n margin-top: 20px !important;\n padding: 10px 15px !important;\n border-radius: 8px !important;\n border: 1px solid #ccc !important;\n }\n \n #btu-calculator fieldset label {\n display: inline-block !important;\n vertical-align: middle !important;\n margin-right: 15px !important;\n }\n\n #btu-calculator fieldset input {\n vertical-align: middle !important;\n margin-right: 5px !important;\n }\n \n #btu-calculator .error {\n color: red !important;\n font-weight: bold !important;\n margin-top: 10px !important;\n }\n\n #btu-calculator #result {\n margin-top: 20px !important;\n font-size: 18px !important;\n font-weight: bold !important;\n color: #dd823b !important;\n }\n <\/style>\n<\/head>\n<body>\n <div id=\"btu-calculator\">\n <div class=\"calculator\">\n <h3>BTU Calculator<\/h3>\n \n \n <label>\n <span>Measurement System:<\/span>\n <select id=\"unitSystem\">\n <option value=\"imperial\">Imperial (ft, \u00b0F)<\/option>\n <option value=\"metric\">Metric (m, \u00b0C)<\/option>\n <\/select>\n <\/label>\n \n \n <label>\n <span>Input Type:<\/span>\n <select id=\"inputType\" onchange=\"updateInputVisibility()\">\n <option value=\"area\">Area + Ceiling Height<\/option>\n <option value=\"volume\">Volume<\/option>\n <\/select>\n <\/label>\n \n \n <label id=\"volumeLabel\" style=\"display: none;\">\n <span id=\"volumeText\">Volume (ft\u00b3):<\/span>\n <input type=\"number\" id=\"volumeInput\" \/>\n <\/label>\n \n \n <label id=\"lengthLabel\">\n <span id=\"lengthText\">Length (ft):<\/span>\n <input type=\"number\" id=\"length\" \/>\n <\/label>\n \n <label id=\"widthLabel\">\n <span id=\"widthText\">Width (ft):<\/span>\n <input type=\"number\" id=\"width\" \/>\n <\/label>\n \n <label id=\"ceilingHeightLabel\">\n <span id=\"ceilingText\">Ceiling Height (ft):<\/span>\n <input type=\"number\" id=\"height\" \/>\n <\/label>\n \n \n <label>\n <span id=\"targetTempText\">Target Temperature (\u00b0F):<\/span>\n <input type=\"number\" id=\"targetTemp\" \/>\n <\/label>\n \n <label>\n <span id=\"outsideTempText\">Outside Temperature (\u00b0F):<\/span>\n <input type=\"number\" id=\"outsideTemp\" \/>\n <\/label>\n \n \n <fieldset>\n <legend>Insulation Level<\/legend>\n <label><input type=\"radio\" name=\"insulation\" value=\"none\" checked \/> None<\/label>\n <label><input type=\"radio\" name=\"insulation\" value=\"bad\" checked \/> Poor<\/label>\n <label><input type=\"radio\" name=\"insulation\" value=\"moderate\" \/> Moderate<\/label>\n <label><input type=\"radio\" name=\"insulation\" value=\"well\" \/> Well<\/label>\n <\/fieldset>\n \n \n <button style=\"margin-top: 15px;\" onclick=\"calculateBTU()\">Calculate BTU<\/button>\n <p id=\"errorMsg\" class=\"error\"><\/p>\n <h4 id=\"result\"><\/h4>\n <div id = \"suggestions\"><\/div>\n <\/div>\n <\/div>\n\n <script>\n const insulationFactors = {\n imperial: { none: 0.25, bad: 0.16, moderate: 0.1, well: 0.05 },\n metric: { none: 4.0, bad: 3.0, moderate: 2.0, well: 1.0 }\n };\n \n const heaterModels = [\n {\n model: \"H-150\",\n fuel: \"Propane\",\n minBTU: 50000,\n maxBTU: 150000,\n },\n {\n model: \"HO-400\",\n fuel: \"Diesel or Kerosene\",\n minBTU: 325000,\n maxBTU: 390000,\n },\n {\n model: \"HO-400R\",\n fuel: \"Diesel or Kerosene\",\n minBTU: 325000,\n maxBTU: 390000,\n },\n {\n model: \"HD-400\",\n fuel: \"Natural Gas or Propane\",\n minBTU: 390000,\n maxBTU: 390000,\n },\n {\n model: \"HD-400R\",\n fuel: \"Natural Gas or Propane\",\n minBTU: 390000,\n maxBTU: 390000,\n },\n {\n model: \"HT-TB1000 Trailblazer\",\n fuel: \"Diesel or Kerosene\",\n minBTU: 650000,\n maxBTU: 780000,\n combined: true\n }\n ];\n\n const unitSystemSelect = document.getElementById('unitSystem');\n const inputTypeSelect = document.getElementById('inputType');\n\n unitSystemSelect.addEventListener('change', updateLabels);\n\n function updateInputVisibility() {\n const inputType = inputTypeSelect.value;\n const isVolume = inputType === 'volume';\n\n \/\/ Enable\/disable volume input\n document.getElementById('volumeInput').disabled = !isVolume;\n \n \/\/ Enable\/disable dimension inputs\n document.getElementById('length').disabled = isVolume;\n document.getElementById('width').disabled = isVolume;\n document.getElementById('height').disabled = isVolume;\n }\n\n function updateLabels() {\n const unitSystem = unitSystemSelect.value;\n const units = unitSystem === 'imperial' ? 'ft' : 'm';\n const tempUnit = unitSystem === 'imperial' ? '\u00b0F' : '\u00b0C';\n const volUnit = unitSystem === 'imperial' ? 'ft\u00b3' : 'm\u00b3';\n\n document.getElementById('lengthText').textContent = `Length (${units}):`;\n document.getElementById('widthText').textContent = `Width (${units}):`;\n document.getElementById('ceilingText').textContent = `Ceiling Height (${units}):`;\n document.getElementById('volumeText').textContent = `Volume (${volUnit}):`;\n document.getElementById('targetTempText').textContent = `Target Temperature (${tempUnit}):`;\n document.getElementById('outsideTempText').textContent = `Outside Temperature (${tempUnit}):`;\n }\n\n function calculateBTU() {\n const unitSystem = unitSystemSelect.value;\n const inputType = inputTypeSelect.value;\n const insulation = document.querySelector('input[name=\"insulation\"]:checked')?.value;\n const errorMsg = document.getElementById('errorMsg');\n errorMsg.textContent = '';\n\n const targetTemp = parseFloat(document.getElementById('targetTemp').value);\n const outsideTemp = parseFloat(document.getElementById('outsideTemp').value);\n\n if (isNaN(targetTemp) || isNaN(outsideTemp)) {\n errorMsg.textContent = 'Please enter both target and outside temperatures.';\n return;\n }\n\n if (targetTemp <= outsideTemp) {\n document.getElementById('result').textContent = `Required Heat Output: 0 BTU\/hr (target temperature is lower than the outside temperature)`;\n return;\n }\n\n let volume;\n\n if (inputType === 'volume') {\n const vol = parseFloat(document.getElementById('volumeInput').value);\n if (isNaN(vol)) {\n errorMsg.textContent = 'Please enter a volume value.';\n return;\n }\n volume = vol;\n } else {\n const length = parseFloat(document.getElementById('length').value);\n const width = parseFloat(document.getElementById('width').value);\n const height = parseFloat(document.getElementById('height').value);\n\n if (isNaN(length) || isNaN(width) || isNaN(height)) {\n errorMsg.textContent = 'Please enter length, width, and ceiling height.';\n return;\n }\n\n volume = length * width * height;\n }\n\n const deltaT = targetTemp - outsideTemp;\n const factor = insulationFactors[unitSystem][insulation];\n let btu;\n\n if (unitSystem === 'imperial') {\n btu = volume * deltaT * factor;\n } else {\n const watts = volume * deltaT * factor;\n btu = watts * 3.96567;\n }\n\n const formattedBTU = Math.round(btu).toLocaleString();\n document.getElementById('result').innerHTML = `Required Heat Output: ${formattedBTU} BTU\/hr`;\n document.getElementById('suggestions').innerHTML = suggestHeaters(btu);\n }\n\nfunction suggestHeaters(btuRequired) {\n \/\/ 1. Find single heaters matching the range\n const singleMatches = heaterModels.filter(h => h.maxBTU >= btuRequired);\n\n if (singleMatches.length > 0) {\n return `\n <p>Suggested Heaters:<\/p>\n <ul>\n ${singleMatches.map(h => `\n <li>\n <strong>${h.model}<\/strong> \u2014 ${h.fuel} (${h.minBTU.toLocaleString()} - ${h.maxBTU.toLocaleString()} BTU\/hr)\n <\/li>`).join(\"\")}\n <\/ul>\n `;\n }\n\n \/\/ 2. No single heater covers it, suggest multiples of heaters that could cover\n \/\/ Filter heaters that can cover at least part of the load (maxBTU > 0)\n const multiples = heaterModels\n .filter(h => h.maxBTU > 0)\n .map(h => {\n const unitsNeeded = Math.ceil(btuRequired \/ h.maxBTU);\n return {\n model: h.model,\n fuel: h.fuel,\n units: unitsNeeded,\n totalBTU: unitsNeeded * h.maxBTU\n };\n })\n \/\/ Sort by totalBTU ascending (suggest most efficient first)\n .sort((a, b) => a.totalBTU - b.totalBTU);\n\n if (multiples.length > 0) {\n return `\n <p>No single model matches the required output. Suggested combinations:<\/p>\n <ul>\n ${multiples.map(h => `\n <li>\n ${h.units} x <strong>${h.model}<\/strong> \u2014 ${h.fuel} (total max output: ${h.totalBTU.toLocaleString()} BTU\/hr)\n <\/li>`).join(\"\")}\n <\/ul>\n <p>Please <a href=\"\/contact-us\">contact us<\/a> for further assistance.<\/p>\n `;\n }\n\n \/\/ Fallback\n return `<p>No suitable heaters found. Please <a href=\"\/contact\">contact us<\/a> for assistance.<\/p>`;\n}\n \/\/ Initialize on first load\n updateLabels();\n updateInputVisibility();\n <\/script>\n<\/body>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p><span style=\"color: #808080;\"><strong>Disclaimer<\/strong>: This BTU calculator provides an estimate only. Actual heating requirements may vary based on additional factors such as building materials, air leakage, ventilation, and usage.<\/span><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div><div class=\"vc_row-full-width vc_clearfix\"><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"BTU Calculator BTU Calculator BTU Calculator Measurement System: Imperial (ft, \u00b0F) Metric (m, \u00b0C) Input Type: Area + Ceiling Height Volume Volume (ft\u00b3): Length (ft): Width<span class=\"excerpt-hellip\"> [\u2026]<\/span>","protected":false},"author":2,"featured_media":-1,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1519","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\n<title>BTU Calculator - Heater Sales and Service<\/title>\n<meta name=\"description\" content=\"Find the perfect heater fast. 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