{"id":48345,"date":"2025-10-15T14:20:19","date_gmt":"2025-10-15T12:20:19","guid":{"rendered":"https:\/\/www.elementishop.com\/ratgeber\/ongecategoriseerd\/btu-calculator-voor-open-haarden-bereken-warmteafgifte-en-verbruik\/"},"modified":"2025-11-04T12:45:17","modified_gmt":"2025-11-04T11:45:17","slug":"btu-calculator-voor-open-haarden-bereken-warmteafgifte-en-verbruik","status":"publish","type":"post","link":"https:\/\/www.elementishop.com\/nl\/ratgeber\/haarden-gids\/btu-calculator-voor-open-haarden-bereken-warmteafgifte-en-verbruik\/","title":{"rendered":"BTU-calculator voor open haarden &#8211; bereken warmteafgifte en verbruik"},"content":{"rendered":"\n<p>Gebruik de BTU-calculator om snel te bepalen hoeveel warmte uw haard nodig heeft. Hij toont de juiste BTU-waarde, het propaan- of aardgasverbruik en helpt je de ideale haard te kiezen voor elk formaat terras. <\/p>\n\n<!-- ===== SECTION 1: BTU-Rechner (Empfehlung) ===== -->\n<section style=\"max-width:960px;margin:0 auto;padding:24px 0\">\n  <h2 style=\"font-size:24px;margin:0 0 12px;font-weight:800\">BTU-calculator voor open haarden<\/h2>\n  <p style=\"color:#6B7280;margin:0 0 16px\">Bereken de juiste warmtebehoefte (BTU\/h) voor uw buitenruimte &#8211; inclusief kW-equivalent, geschat brandstofverbruik (propaan\/aardgas) en gebruikskosten. <\/p>\n\n  <div class=\"grid\" style=\"display:grid;grid-template-columns:1fr;gap:16px\">\n    <!-- Eingaben -->\n    <div class=\"card\" style=\"background:#F8F9FB;border-radius:16px;padding:18px 16px\">\n      <div style=\"margin:0 0 10px;font-size:18px\">Ingangen<\/div>\n\n      <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px\">\n        <div>\n          <label for=\"area\" style=\"display:block;font-weight:600;margin-bottom:6px\">Oppervlakte (m^2)<\/label>\n          \n        <\/div>\n        <div>\n          <label for=\"temp\" style=\"display:block;font-weight:600;margin-bottom:6px\">Buitentemperatuur (C, minimaal)<\/label>\n          \n        <\/div>\n      <\/div>\n\n      <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px%\">\n        <div>\n          <label for=\"wind\" style=\"display:block;font-weight:600;margin-bottom:6px\">Mate van windbescherming<\/label>\n          \n            Goed beschermd (overdekt\/omheind)\n            Gedeeltelijk beschermd\n            Open\/winderig\n           \n        <\/div>\n        <div>\n          <label for=\"distance\" style=\"display:block;font-weight:600;margin-bottom:6px\">Zitafstand tot de open haard (m)<\/label>\n          \n        <\/div>\n      <\/div>\n\n      <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px\">\n        <div>\n          <label for=\"purpose\" style=\"display:block;font-weight:600;margin-bottom:6px\">Beoogd gebruik<\/label>\n          \n            Verwarmen (opwarmen)\n            Alleen sfeer (decoratieve vlam)\n           \n        <\/div>\n        <div>\n          <label for=\"eff\" style=\"display:block;font-weight:600;margin-bottom:6px\">Apparaateffici\u00ebntie (%)<\/label>\n          \n        <\/div>\n      <\/div>\n\n      <div style=\"margin:16px 0 10px;font-size:18px\">Energieprijzen (optioneel)<\/div>\n      <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px\">\n        <div>\n          <label for=\"pPrice\" style=\"display:block;font-weight:600;margin-bottom:6px\">Prijs propaan (EUR\/kg)<\/label>\n          \n        <\/div>\n        <div>\n          <label for=\"gPrice\" style=\"display:block;font-weight:600;margin-bottom:6px\">Aardgasprijs (EUR\/m^3)<\/label>\n          \n        <\/div>\n      <\/div>\n\n      <div class=\"actions\" style=\"display:flex;gap:10px;flex-wrap:wrap;margin-top:12px\">\n        <button id=\"calc\" style=\"background:#D05F22;color:#fff;border:0;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer\">Nu berekenen<\/button>\n        <button class=\"secondary\" id=\"reset\" style=\"background:#1118270D;color:#111827;border:1px solid #E2E8F0;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer\">Reset<\/button>\n      <\/div>\n\n      <p style=\"color:#6B7280;font-size:13px;line-height:1.6;margin-top:10px\">\n  Opmerking: Voor buitensituaties wordt niet de hele kamer verwarmd. De calculator gebruikt heuristieken (oppervlakte x basis BTU per m^2 x correctiefactoren). \n      <\/p>\n    <\/div>\n\n    <!-- Ausgaben -->\n    <div class=\"card\" style=\"background:#F8F9FB;border-radius:16px;padding:18px 16px\">\n      <div style=\"margin:0 0 10px;font-size:18px\">Resultaten<\/div>\n\n      <div class=\"out\" style=\"background:#fff;border:1px dashed #E5E7EB;border-radius:14px;padding:14px\">\n        <div style=\"margin:0 0 8px;font-size:16px\">Aanbevolen vermogen<\/div>\n        <div class=\"kpi\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px\">\n          <div id=\"btuRange\" style=\"background:#F3F4F6;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">&#8211;<\/div>\n          <div id=\"kwRange\" style=\"background:#F3F4F6;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">&#8211;<\/div>\n        <\/div>\n        &lt;!&#8211; \u5df2\u79fb\u9664\uff1a<p id=\"contextText\">\u2026<\/p> &#8211;&gt;\n      <\/div>\n\n      <div class=\"out\" style=\"background:#fff;border:1px dashed #E5E7EB;border-radius:14px;padding:14px;margin-top:12px\">\n        <div style=\"margin:0 0 8px;font-size:16px\">Verbruik (geschat)<\/div>\n        <div class=\"kpi\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px\">\n          <div id=\"propaneUse\" style=\"background:#ECFDF5;color:#0E9F6E;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Propaan: &#8211; kg\/h<\/div>\n          <div id=\"gasUse\" style=\"background:#ECFDF5;color:#0E9F6E;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Aardgas: &#8211; m^3\/h<\/div>\n        <\/div>\n        <p style=\"color:#6B7280;margin:10px 0 0\">\n  Aannames: Propaan ~ 46 000 BTU\/kg, aardgas ~ 36 000 BTU\/m^3. Rendement volgens input. \n        <\/p>\n      <\/div>\n\n      <div class=\"out\" style=\"background:#fff;border:1px dashed #E5E7EB;border-radius:14px;padding:14px;margin-top:12px\">\n        <div style=\"margin:0 0 8px;font-size:16px\">Kosten (optioneel)<\/div>\n        <div class=\"kpi\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px\">\n          <div id=\"propaneCost\" style=\"background:#FFFBEB;color:#C27803;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Propaan: &#8211; EUR\/h<\/div>\n          <div id=\"gasCost\" style=\"background:#FFFBEB;color:#C27803;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Aardgas: &#8211; EUR\/h<\/div>\n        <\/div>\n      <\/div>\n\n      <div class=\"out\" style=\"background:#fff;border:1px dashed #E5E7EB;border-radius:14px;padding:14px;margin-top:12px\">\n        <div style=\"margin:0 0 8px;font-size:16px\">Conversie<\/div>\n        <p style=\"color:#6B7280\">1 kW ~ 3412 BTU\/h | 1 BTU ~ 0,000293 kWh<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n\n  <details style=\"margin-top:18px\">\n    <summary style=\"cursor:pointer;font-weight:700\">Berekeningslogica en aannames<\/summary>\n    <div style=\"color:#6B7280;font-size:13px;line-height:1.6;margin-top:8px\">\n      <p><strong>Basisformule:<\/strong> BTU = oppervlakte (m^2) x 1200 BTU\/m^2 x factoren<\/p>\n      <ul>\n        <li><strong>Windbescherming:<\/strong> beschermd x0,8, gedeeltelijk x1,0, open x1,3<\/li>\n        <li><strong>Temperatuur:<\/strong> C 15 x1,00<\/li>\n        <li><strong>Afstand tussen de stoelen:<\/strong> 2,5 m x1,15<\/li>\n        <li><strong>Doel:<\/strong> Verwarming x1,00, Ambiance x0,70<\/li>\n      <\/ul>\n      <p>Aanbevolen bereik = +-15% rond de doelwaarde, min. 15000 BTU\/h, max. 200000 BTU\/h.  <\/p>\n      <p><strong>Verbruiksformule:<\/strong> Verbruik = BTU \/ (calorische waarde x rendement). Propaan ~ 46000 BTU\/kg, aardgas ~ 36000 BTU\/m^3. <\/p>\n      <p>Opmerking: Praktische richtwaarde calculator voor stralingswarmte buitenshuis, geen verwarmingsbelasting verificatie voor kamers binnenshuis.<\/p>\n    <\/div>\n  <\/details>\n<\/section>\n\n\n(function(){\n  const $ = id =&gt; document.getElementById(id);\n\n  function factorWind(v){ if(v===&#8217;sheltered&#8217;) return 0.8; if(v===&#8217;exposed&#8217;) return 1.3; return 1.0; }\n  function factorTemp(t){ if(t&lt;=5) return 1.25; if(t&lt;=10) return 1.15; if(t&lt;=15) return 1.05; return 1.00; }\n  function factorDistance(d){ if(d2.5) return 1.15; return 1.00; }\n  function factorPurpose(p){ return p===&#8217;ambience&#8217; ? 0.70 : 1.00; }\n  function clamp(v,min,max){ return Math.max(min, Math.min(max, v)); }\n  function fmt(n,dec=0){ return n.toLocaleString(&#8216;de-DE&#8217;,{minimumFractionDigits:dec, maximumFractionDigits:dec}); }\n  const toKW = btu =&gt; btu \/ 3412.142;\n\n  function calc(){\n    const area = Math.max(1, Number($(&#8216;area&#8217;).value||0));\n    const temp = Number($(&#8217;temp&#8217;).value||0);\n    const wind = $(&#8216;wind&#8217;).value;\n    const dist = Math.max(0.5, Number($(&#8216;distance&#8217;).value||2));\n    const purpose = $(&#8216;purpose&#8217;).value;\n    const effPct = clamp(Number($(&#8216;eff&#8217;).value||85), 50, 100);\n\n    const baseBTUperM2 = 1200;\n    const f = factorWind(wind) * factorTemp(temp) * factorDistance(dist) * factorPurpose(purpose);\n\n    let targetBTU = area * baseBTUperM2 * f;\n    targetBTU = clamp(targetBTU, 15000, 200000);\n\n    const low = targetBTU * 0.85;\n    const high = targetBTU * 1.15;\n\n    const eff = effPct \/ 100;\n    const BTU_per_kg_propan = 46000;\n    const BTU_per_m3_gas   = 36000;\n\n    const propaneKgH = targetBTU \/ (BTU_per_kg_propan * eff);\n    const gasM3H     = targetBTU \/ (BTU_per_m3_gas * eff);\n\n    const pPrice = Number($(&#8216;pPrice&#8217;).value||0);\n    const gPrice = Number($(&#8216;gPrice&#8217;).value||0);\n    const pCost = pPrice ? propaneKgH * pPrice : null;\n    const gCost = gPrice ? gasM3H * gPrice : null;\n\n    $(&#8216;btuRange&#8217;).textContent = fmt(low) + &#8221; &#8211; &#8221; + fmt(high) + &#8221; BTU\/h&#8221;;\n    $(&#8216;kwRange&#8217;).textContent  = fmt(toKW(low),1) + &#8221; &#8211; &#8221; + fmt(toKW(high),1) + &#8221; kW&#8221;;\n\n    $(&#8216;propaneUse&#8217;).textContent = &#8220;Propan: &#8221; + fmt(propaneKgH,3) + &#8221; kg\/h&#8221;;\n    $(&#8216;gasUse&#8217;).textContent     = &#8220;Erdgas: &#8221; + fmt(gasM3H,3) + &#8221; m^3\/h&#8221;;\n\n    $(&#8216;propaneCost&#8217;).textContent = pCost!=null ? (&#8220;Propan: &#8221; + fmt(pCost,2) + &#8221; EUR\/h&#8221;) : &#8220;Propan: &#8211; EUR\/h&#8221;;\n    $(&#8216;gasCost&#8217;).textContent     = gCost!=null ? (&#8220;Erdgas: &#8221; + fmt(gCost,2) + &#8221; EUR\/h&#8221;) : &#8220;Erdgas: &#8211; EUR\/h&#8221;;\n  }\n\n  document.getElementById(&#8216;calc&#8217;).addEventListener(&#8216;click&#8217;, calc);\n  [&#8216;area&#8217;,&#8217;temp&#8217;,&#8217;wind&#8217;,&#8217;distance&#8217;,&#8217;purpose&#8217;,&#8217;eff&#8217;,&#8217;pPrice&#8217;,&#8217;gPrice&#8217;].forEach(id=&gt;{\n    const el = document.getElementById(id);\n    el &amp;&amp; el.addEventListener(&#8216;keydown&#8217;, e=&gt;{ if(e.key===&#8217;Enter&#8217;) calc(); });\n  });\n  document.getElementById(&#8216;reset&#8217;).addEventListener(&#8216;click&#8217;, ()=&gt;{\n    $(&#8216;area&#8217;).value=20; $(&#8217;temp&#8217;).value=8; $(&#8216;wind&#8217;).value=&#8217;partial&#8217;;\n    $(&#8216;distance&#8217;).value=2.0; $(&#8216;purpose&#8217;).value=&#8217;heating&#8217;; $(&#8216;eff&#8217;).value=85;\n    $(&#8216;pPrice&#8217;).value=&#8221;; $(&#8216;gPrice&#8217;).value=&#8221;;\n    [&#8216;btuRange&#8217;,&#8217;kwRange&#8217;,&#8217;propaneUse&#8217;,&#8217;gasUse&#8217;,&#8217;propaneCost&#8217;,&#8217;gasCost&#8217;].forEach(id=&gt;$(id).textContent=&#8217;-&#8216;);\n  });\n\n  calc();\n})();\n\n\n\n<!-- ===== SECTION 2: Direkteingabe (vorhandene BTU) ===== -->\n<section style=\"max-width:960px;margin:16px auto 0 auto;padding:0 0 24px\">\n  <h2 style=\"font-size:24px;margin:0 0 12px;font-weight:800\">Directe invoer: verbruik van bestaande BTU<\/h2>\n\n  <div class=\"card\" style=\"background:#F8F9FB;border-radius:16px;padding:18px 16px\">\n    <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px\">\n      <div>\n        <label for=\"btuKnown\" style=\"display:block;font-weight:600;margin-bottom:6px\">Beschikbaar vermogen (BTU\/h)<\/label>\n        \n      <\/div>\n      <div>\n        <label for=\"effKnown\" style=\"display:block;font-weight:600;margin-bottom:6px\">Apparaateffici\u00ebntie (%)<\/label>\n        \n      <\/div>\n    <\/div>\n\n    <div class=\"row\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px\">\n      <div>\n        <label for=\"pPrice2\" style=\"display:block;font-weight:600;margin-bottom:6px\">Prijs propaan (EUR\/kg)<\/label>\n        \n      <\/div>\n      <div>\n        <label for=\"gPrice2\" style=\"display:block;font-weight:600;margin-bottom:6px\">Aardgasprijs (EUR\/m^3)<\/label>\n        \n      <\/div>\n    <\/div>\n\n    <div class=\"actions\" style=\"display:flex;gap:10px;flex-wrap:wrap;margin-top:12px\">\n      <button id=\"calcKnown\" style=\"background:#D05F22;color:#fff;border:0;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer\">Verbruik berekenen<\/button>\n      <button class=\"secondary\" id=\"resetKnown\" style=\"background:#1118270D;color:#111827;border:1px solid #E5E7EB;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer\">Reset<\/button>\n    <\/div>\n\n    <div class=\"out\" style=\"background:#fff;border:1px dashed #E5E7EB;border-radius:14px;padding:14px;margin-top:12px\">\n      <div style=\"margin:0 0 8px;font-size:16px\">Resultaten<\/div>\n      <div class=\"kpi\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:8px\">\n        <div id=\"knownPropaneUse\" style=\"background:#ECFDF5;color:#0E9F6E;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Propaan: &#8211; kg\/h<\/div>\n        <div id=\"knownGasUse\" style=\"background:#ECFDF5;color:#0E9F6E;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Aardgas: &#8211; m^3\/h<\/div>\n      <\/div>\n      <div class=\"kpi\" style=\"display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px\">\n        <div id=\"knownPropaneCost\" style=\"background:#FFFBEB;color:#C27803;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Propaan: &#8211; EUR\/h<\/div>\n        <div id=\"knownGasCost\" style=\"background:#FFFBEB;color:#C27803;border-radius:999px;padding:8px 12px;font-weight:700;text-align:center\">Aardgas: &#8211; EUR\/h<\/div>\n      <\/div>\n      <p style=\"color:#6B7280;margin-top:10px\">Conversie: <span id=\"knownKW\">&#8211; kW<\/span> | Aannames: Propaan ~ 46000 BTU\/kg, aardgas ~ 36000 BTU\/m^3.<\/p>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n(function(){\n  const $ = id =&gt; document.getElementById(id);\n  const BTU_PER_KG_PROPAN = 46000;\n  const BTU_PER_M3_GAS    = 36000;\n  const toKW = btu =&gt; btu \/ 3412.142;\n  function fmt(n,dec=0){ return Number(n).toLocaleString(&#8216;de-DE&#8217;,{minimumFractionDigits:dec, maximumFractionDigits:dec}); }\n  function clamp(v,min,max){ return Math.max(min, Math.min(max, v)); }\n\n  function calcKnown(){\n    const btu = Math.max(0, Number(($(&#8216;btuKnown&#8217;).value||&#8221;).toString().replace(&#8216;,&#8217;,&#8217;.&#8217;)));\n    const effPct = clamp(Number(($(&#8216;effKnown&#8217;).value||&#8221;).toString().replace(&#8216;,&#8217;,&#8217;.&#8217;)) || 85, 50, 100);\n    const eff = effPct\/100;\n    if(!btu || eff{\n    $(&#8216;btuKnown&#8217;).value=&#8221;; $(&#8216;effKnown&#8217;).value=85; $(&#8216;pPrice2&#8217;).value=&#8221;; $(&#8216;gPrice2&#8217;).value=&#8221;;\n    $(&#8216;knownPropaneUse&#8217;).textContent=&#8217;Propan: &#8211; kg\/h&#8217;;\n    $(&#8216;knownGasUse&#8217;).textContent=&#8217;Erdgas: &#8211; m^3\/h&#8217;;\n    $(&#8216;knownPropaneCost&#8217;).textContent=&#8217;Propan: &#8211; EUR\/h&#8217;;\n    $(&#8216;knownGasCost&#8217;).textContent=&#8217;Erdgas: &#8211; EUR\/h&#8217;;\n    $(&#8216;knownKW&#8217;).textContent=&#8217;- kW&#8217;;\n  });\n})();\n\n","protected":false},"excerpt":{"rendered":"<p>Gebruik de BTU-calculator om snel te bepalen hoeveel warmte uw haard nodig heeft. Hij toont de juiste BTU-waarde, het propaan- [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":48346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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