{"id":2226,"date":"2026-01-29T23:36:51","date_gmt":"2026-01-29T21:36:51","guid":{"rendered":"https:\/\/nature-o.net\/?page_id=2226"},"modified":"2026-02-02T17:25:23","modified_gmt":"2026-02-02T15:25:23","slug":"heat-pump-vs-gas-boiler-savings-calculator","status":"publish","type":"page","link":"https:\/\/nature-o.net\/?page_id=2226","title":{"rendered":"Heat Pump vs Gas Boiler Savings Calculator"},"content":{"rendered":"\n<div class=\"eco-tool wp-block-group\" id=\"eco-tool-heatpump-8b6e3\">\n  <div class=\"eco-tool__header\">\n    <h2 class=\"eco-tool__title\">Heat Pump vs Gas Boiler Savings Calculator<\/h2>\n    <p class=\"eco-tool__lead\">\n      Estimate annual heating cost and CO\u2082 emissions for a heat pump versus a gas boiler. This is a simplified model for education and comparison.\n    <\/p>\n  <\/div>\n\n  <form class=\"eco-tool__form\" id=\"eco-hp-form-8b6e3\" novalidate>\n    <div class=\"eco-tool__grid3\">\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-area-8b6e3\">Home area (m\u00b2)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-hp-area-8b6e3\" type=\"number\" min=\"10\" step=\"1\" value=\"100\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Total heated floor area.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-temp-8b6e3\">Average winter temp (\u00b0C)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-hp-temp-8b6e3\" type=\"number\" min=\"-40\" max=\"20\" step=\"0.5\" value=\"2\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Colder winters usually mean higher heating demand.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-insulation-8b6e3\">Home efficiency \/ insulation<\/label>\n        <select class=\"eco-tool__input\" id=\"eco-hp-insulation-8b6e3\">\n          <option value=\"good\">Good (modern\/insulated)<\/option>\n          <option value=\"avg\" selected>Average<\/option>\n          <option value=\"poor\">Poor (older\/leaky)<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">Affects annual heating energy needed.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-cop-8b6e3\">Heat pump COP<br>(avg)<\/label>\n        <select class=\"eco-tool__input\" id=\"eco-hp-cop-8b6e3\">\n          <option value=\"2.5\">2.5 (cold climate \/ older)<\/option>\n          <option value=\"3.0\" selected>3.0 (typical)<\/option>\n          <option value=\"3.5\">3.5 (good system)<\/option>\n          <option value=\"4.0\">4.0 (excellent)<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">Higher COP = less electricity needed.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-elecprice-8b6e3\">Electricity price<br>(per kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-hp-elecprice-8b6e3\" type=\"number\" min=\"0\" step=\"0.01\" value=\"0.20\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Example: 0.20 per kWh.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-gasprice-8b6e3\">Gas price<br>(per kWh)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-hp-gasprice-8b6e3\" type=\"number\" min=\"0\" step=\"0.01\" value=\"0.10\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Use kWh-equivalent price if possible.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-hp-currency-8b6e3\">Currency<br>(display)<\/label>\n        <select class=\"eco-tool__input\" id=\"eco-hp-currency-8b6e3\">\n          <option value=\"$\">$ (USD)<\/option>\n          <option value=\"\u20ac\" selected>\u20ac (EUR)<\/option>\n          <option value=\"\u00a3\">\u00a3 (GBP)<\/option>\n          <option value=\"\u20bd\">\u20bd (RUB)<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">Only affects formatting.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\">Quick presets<\/label>\n        <div class=\"eco-tool__presets\">\n          <button type=\"button\" class=\"eco-tool__chip\" data-p=\"mild\">Mild<\/button>\n          <button type=\"button\" class=\"eco-tool__chip\" data-p=\"avg\">Average<\/button>\n          <button type=\"button\" class=\"eco-tool__chip\" data-p=\"cold\">Cold<\/button>\n        <\/div>\n        <div class=\"eco-tool__hint\">Sets a typical winter temperature.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__actions\">\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn\" id=\"eco-hp-calc-8b6e3\">Calculate<\/button>\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn eco-tool__btn--ghost\" id=\"eco-hp-reset-8b6e3\">Reset<\/button>\n      <div class=\"eco-tool__error\" id=\"eco-hp-error-8b6e3\" aria-live=\"polite\"><\/div>\n    <\/div>\n  <\/form>\n\n  <div class=\"eco-tool__result\" id=\"eco-hp-result-8b6e3\" hidden>\n    <h3 class=\"eco-tool__subtitle\">Result<\/h3>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Annual cost (heat pump)<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-hp-costhp-8b6e3\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-hp-costhp-sub-8b6e3\"><\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Annual cost (gas boiler)<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-hp-costgas-8b6e3\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-hp-costgas-sub-8b6e3\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Annual CO\u2082 (heat pump)<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-hp-co2hp-8b6e3\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-hp-co2hp-sub-8b6e3\"><\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Annual CO\u2082 (gas boiler)<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-hp-co2gas-8b6e3\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-hp-co2gas-sub-8b6e3\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__card eco-tool__card--wide\">\n      <div class=\"eco-tool__metric-label\">Difference (savings)<\/div>\n      <div class=\"eco-tool__metric-value\" id=\"eco-hp-save-8b6e3\">\u2014<\/div>\n      <div class=\"eco-tool__metric-sub\" id=\"eco-hp-save-sub-8b6e3\"><\/div>\n    <\/div>\n\n    <p class=\"eco-tool__note\">\n      This model estimates heating energy demand from winter temperature and home insulation level. Real systems vary by building and equipment.\n    <\/p>\n  <\/div>\n\n  <details class=\"eco-tool__details\">\n    <summary class=\"eco-tool__summary\">Assumptions used<\/summary>\n    <div class=\"eco-tool__details-body\">\n      <ul class=\"eco-tool__list\" id=\"eco-hp-assumptions-8b6e3\"><\/ul>\n    <\/div>\n  <\/details>\n<\/div>\n\n<style>\n.eco-tool{ border:1px solid rgba(0,0,0,.12); border-radius:12px; padding:16px; }\n.eco-tool__header{ margin-bottom:12px; }\n.eco-tool__title{ margin:0 0 8px; }\n.eco-tool__lead{ margin:0; opacity:.9; }\n\n.eco-tool__form{ margin-top:12px; }\n.eco-tool__grid3{ display:grid; grid-template-columns:1fr; gap:16px; }\n@media (min-width:860px){ .eco-tool__grid3{ grid-template-columns:1fr 1fr 1fr; } }\n\n.eco-tool__field{ display:flex; flex-direction:column; gap:6px; }\n.eco-tool__label{ font-weight:600; }\n.eco-tool__input{\n  width:100%; height:44px; padding:0 12px;\n  border:1px solid rgba(0,0,0,.20); border-radius:10px; background:#fff;\n  box-sizing:border-box; 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align-items:center; margin-top:16px; }\n.eco-tool__btn{ padding:10px 22px; }\n.eco-tool__btn--ghost{ background:transparent !important; border:1px solid rgba(0,0,0,.20) !important; }\n.eco-tool__btn--ghost:hover, .eco-tool__btn--ghost:focus{\n  background:rgba(0,0,0,.06) !important; border-color:rgba(0,0,0,.35) !important;\n}\n.eco-tool__error{ min-height:1.2em; font-weight:600; flex:1 1 240px; }\n\n.eco-tool__result{ margin-top:16px; }\n.eco-tool__subtitle{ margin:0 0 10px; }\n\n.eco-tool__cards{ display:grid; gap:10px; grid-template-columns:1fr; }\n@media (min-width:860px){ .eco-tool__cards{ grid-template-columns:1fr 1fr; } }\n\n.eco-tool__card{ border:1px solid rgba(0,0,0,.12); border-radius:12px; padding:12px; }\n.eco-tool__card--wide{ margin-top:10px; }\n\n.eco-tool__metric-label{ opacity:.85; font-weight:600; }\n.eco-tool__metric-value{ font-size:1.7em; font-weight:900; margin-top:6px; line-height:1.1; }\n.eco-tool__metric-sub{ opacity:.85; margin-top:6px; }\n\n.eco-tool__note{ margin:10px 0 0; opacity:.9; }\n.eco-tool__details{ margin-top:14px; }\n.eco-tool__summary{ cursor:pointer; font-weight:700; }\n.eco-tool__details-body{ margin-top:10px; }\n.eco-tool__list{ margin:0; padding-left:18px; }\n<\/style>\n\n<script>\n(function(){\n  const S = \"8b6e3\";\n  const el = (id) => document.getElementById(id + \"-\" + S);\n\n  const areaEl = el(\"eco-hp-area\");\n  const tempEl = el(\"eco-hp-temp\");\n  const insEl  = el(\"eco-hp-insulation\");\n  const copEl  = el(\"eco-hp-cop\");\n  const ePriceEl = el(\"eco-hp-elecprice\");\n  const gPriceEl = el(\"eco-hp-gasprice\");\n  const curEl = el(\"eco-hp-currency\");\n\n  const calcBtn = el(\"eco-hp-calc\");\n  const resetBtn = el(\"eco-hp-reset\");\n  const errorEl = el(\"eco-hp-error\");\n\n  const resultEl = el(\"eco-hp-result\");\n  const costHpEl = el(\"eco-hp-costhp\");\n  const costHpSubEl = el(\"eco-hp-costhp-sub\");\n  const costGasEl = el(\"eco-hp-costgas\");\n  const costGasSubEl = el(\"eco-hp-costgas-sub\");\n  const co2HpEl = el(\"eco-hp-co2hp\");\n  const co2HpSubEl = el(\"eco-hp-co2hp-sub\");\n  const co2GasEl = el(\"eco-hp-co2gas\");\n  const co2GasSubEl = el(\"eco-hp-co2gas-sub\");\n  const saveEl = el(\"eco-hp-save\");\n  const saveSubEl = el(\"eco-hp-save-sub\");\n  const asmEl = el(\"eco-hp-assumptions\");\n\n  const chips = document.querySelectorAll('#eco-tool-heatpump-' + S + ' .eco-tool__chip');\n\n  function setError(msg){ errorEl.textContent = msg || \"\"; }\n  function n(v){ return Number(v); }\n\n  function fmtMoney(x){\n    const sym = curEl.value || \"$\";\n    const v = Math.round(x * 100) \/ 100;\n    return sym + v.toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 });\n  }\n  function fmtKgYear(x){\n    const v = Math.round(x);\n    return v.toLocaleString() + \" kg CO\u2082\/year\";\n  }\n\n  \/\/ Hidden averages (not shown to user)\n  const GRID_CO2 = 0.35; \/\/ kg CO2 per kWh electricity (average)\n  const GAS_CO2  = 0.20; \/\/ kg CO2 per kWh gas (average)\n\n  \/\/ Temperature-based heating demand model (kWh\/m\u00b2\/year)\n  \/\/ Colder temp => higher demand. Clamp to avoid extremes.\n  \/\/ Example rough points:\n  \/\/ 10\u00b0C -> ~55, 5\u00b0C -> ~75, 0\u00b0C -> ~95, -5\u00b0C -> ~120, -10\u00b0C -> ~145, -15\u00b0C -> ~170\n  function demandPerM2(avgWinterC){\n    const t = Math.max(-25, Math.min(15, avgWinterC));\n    const d = 95 + (0 - t) * 5; \/\/ baseline around 0\u00b0C\n    return Math.max(50, Math.min(190, d));\n  }\n\n  const INS = { good: 0.80, avg: 1.00, poor: 1.25 };\n\n  function fillAssumptions(){\n    asmEl.innerHTML = [\n      `<li><strong>Heating demand:<\/strong> based on average winter temperature (toy model), ~${Math.round(demandPerM2(0))} kWh\/m\u00b2\/year at 0\u00b0C.<\/li>`,\n      `<li><strong>Insulation multiplier:<\/strong> good \u00d7${INS.good}, average \u00d7${INS.avg}, poor \u00d7${INS.poor}.<\/li>`,\n      `<li><strong>Heat pump electricity:<\/strong> heating kWh \u00f7 COP.<\/li>`,\n      `<li><strong>CO\u2082 factors (fixed averages):<\/strong> electricity ${GRID_CO2} kg\/kWh, gas ${GAS_CO2} kg\/kWh.<\/li>`\n    ].join(\"\");\n  }\n\n  function calculate(){\n    setError(\"\");\n\n    const area = n(areaEl.value);\n    const temp = n(tempEl.value);\n    const cop = n(copEl.value);\n    const ePrice = n(ePriceEl.value);\n    const gPrice = n(gPriceEl.value);\n\n    if (!Number.isFinite(area) || area <= 0){\n      setError(\"Please enter a valid home area (greater than 0).\");\n      resultEl.hidden = true;\n      return;\n    }\n    if (!Number.isFinite(temp) || temp < -40 || temp > 20){\n      setError(\"Please enter a realistic average winter temperature (between -40 and 20\u00b0C).\");\n      resultEl.hidden = true;\n      return;\n    }\n    if (!Number.isFinite(cop) || cop <= 0){\n      setError(\"Please choose a valid COP.\");\n      resultEl.hidden = true;\n      return;\n    }\n    if (![ePrice, gPrice].every(x => Number.isFinite(x) && x >= 0)){\n      setError(\"Please enter valid non-negative prices.\");\n      resultEl.hidden = true;\n      return;\n    }\n\n    const heatDemand = demandPerM2(temp) * (INS[insEl.value] || 1) * area; \/\/ kWh heat\/year\n\n    const hpElec = heatDemand \/ cop; \/\/ kWh electricity\/year\n    const hpCost = hpElec * ePrice;\n    const hpCO2  = hpElec * GRID_CO2;\n\n    const gasEnergy = heatDemand; \/\/ simplified\n    const gasCost = gasEnergy * gPrice;\n    const gasCO2  = gasEnergy * GAS_CO2;\n\n    costHpEl.textContent = fmtMoney(hpCost);\n    costHpSubEl.textContent = `${Math.round(hpElec).toLocaleString()} kWh electricity\/year (heat \u00f7 COP).`;\n\n    costGasEl.textContent = fmtMoney(gasCost);\n    costGasSubEl.textContent = `${Math.round(gasEnergy).toLocaleString()} kWh gas\/year (simplified).`;\n\n    co2HpEl.textContent = fmtKgYear(hpCO2);\n    co2HpSubEl.textContent = `Using average electricity factor (${GRID_CO2} kg\/kWh).`;\n\n    co2GasEl.textContent = fmtKgYear(gasCO2);\n    co2GasSubEl.textContent = `Using average gas factor (${GAS_CO2} kg\/kWh).`;\n\n    const moneyDiff = gasCost - hpCost;\n    const co2Diff = gasCO2 - hpCO2;\n\n    const moneyLabel = moneyDiff >= 0\n      ? `Save ${fmtMoney(moneyDiff)} \/ year`\n      : `Heat pump costs +${fmtMoney(Math.abs(moneyDiff))} \/ year`;\n\n    const co2Label = co2Diff >= 0\n      ? `Reduce ${fmtKgYear(co2Diff)}`\n      : `Increase +${fmtKgYear(Math.abs(co2Diff))}`;\n\n    saveEl.textContent = moneyLabel;\n    saveSubEl.textContent = `${co2Label}. (Rough estimate.)`;\n\n    resultEl.hidden = false;\n  }\n\n  function reset(){\n    setError(\"\");\n    areaEl.value = \"100\";\n    tempEl.value = \"2\";\n    insEl.value = \"avg\";\n    copEl.value = \"3.0\";\n    ePriceEl.value = \"0.20\";\n    gPriceEl.value = \"0.10\";\n    curEl.value = \"\u20ac\";\n    resultEl.hidden = true;\n  }\n\n  chips.forEach(btn => {\n    btn.addEventListener(\"click\", function(){\n      const p = this.getAttribute(\"data-p\");\n      if (p === \"mild\") tempEl.value = \"8\";\n      if (p === \"avg\") tempEl.value = \"2\";\n      if (p === \"cold\") tempEl.value = \"-8\";\n    });\n  });\n\n  fillAssumptions();\n  calcBtn.addEventListener(\"click\", calculate);\n  resetBtn.addEventListener(\"click\", reset);\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Heat Pump vs Gas Boiler Savings Calculator Estimate annual heating cost and CO\u2082 emissions for a heat pump versus a gas boiler. This is a simplified model for education and&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2452,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"_links":{"self":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2226"}],"collection":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2226"}],"version-history":[{"count":6,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2226\/revisions"}],"predecessor-version":[{"id":2291,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2226\/revisions\/2291"}],"up":[{"embeddable":true,"href":"https:\/\/nature-o.net\/index.php?rest_route=\/wp\/v2\/pages\/2452"}],"wp:attachment":[{"href":"https:\/\/nature-o.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}