{"id":19791,"date":"2026-10-24T16:32:59","date_gmt":"2026-10-24T14:32:59","guid":{"rendered":"https:\/\/templari.com\/heat-pump-ice-steam-water\/"},"modified":"2026-10-26T12:43:02","modified_gmt":"2026-10-26T11:43:02","slug":"heat-pump-ice-steam-water","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/heat-pump-ice-steam-water\/","title":{"rendered":"Heat pump with ice, steam or water underneath: what is normal and when to call for service"},"content":{"rendered":"<div id=\"aa\">\n<style>body:has(#aa){overflow:visible!important;overflow-x:clip!important}body:has(#aa) .featured-media-under-header{display:none!important}body:has(#aa) .container-wrap{padding:0!important;background:#000!important}body:has(#aa) .container-wrap .main-content,body:has(#aa) .main-content>.row,body:has(#aa) .post-area,body:has(#aa) article.post,body:has(#aa) article .inner-wrap,body:has(#aa) .post-content,body:has(#aa) 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summary{list-style:none;cursor:pointer;font-size:19px;font-weight:600;color:#fff;display:flex;justify-content:space-between;gap:18px}#aa .chiara summary{color:#051822}#aa summary::-webkit-details-marker{display:none}#aa summary:after{content:\"+\";color:#0BABE4;font-size:26px;line-height:1;font-weight:400}#aa .chiara summary:after{color:#05587a}#aa details[open] summary:after{content:\"\\2212\"}#aa details p{margin:12px 0 0}#aa .larga,#aa .fine .wrap{max-width:1160px}@media(min-width:1000px){#aa .duo .larga{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:56px;align-items:start}#aa .duo.inv .testo{order:2}#aa .duo .foto{position:sticky;top:190px}#aa .duo .foto figure{margin:0 0 26px}#aa .duo .foto figure:last-child{margin-bottom:0}#aa .duo .foto img{max-height:72vh}#aa .duo.senza .larga{grid-template-columns:minmax(0,1fr) minmax(0,1.6fr)}#aa .duo.senza .testa{position:sticky;top:190px}}body:has(#aa) #header-outer{background:#000!important}#aa .fine{padding:36px 0 52px}#aa .fine p{font-size:16px}@media(max-width:820px){#aa{font-size:18px}#aa p,#aa li{font-size:18px}#aa .hero{min-height:auto}#aa .hero .in{padding:96px 20px 32px}#aa .lead{font-size:18px}#aa .sec{padding:40px 0}#aa .wrap{padding:0 20px}#aa .subnav{top:64px}#aa .faq .wrap{grid-template-columns:1fr;gap:8px}}<\/style>\n<section class=\"hero\" style=\"background-image:url(https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p11-pompa-di-calore-aria-acqua-r290-nuova-2-5.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>Heat pump with ice, steam or water underneath: what is normal and when to call for service<\/h1>\n<p class=\"lead\">In winter, heat pump owners see it do things a boiler never does: it frosts over, puffs out a cloud of steam, leaves water underneath. In Germany &#8220;W\u00e4rmepumpe vereist&#8221; is searched 590 times a month, &#8220;W\u00e4rmepumpe dampft&#8221; 480, condensate drainage another 480; in France &#8220;pompe \u00e0 chaleur givre&#8221; 170 per variant. Here we explain why it happens, where the water must go and when you should call for service.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">Why the coil frosts up<\/a><a href=\"#s2\">How much frost costs in output<\/a><a href=\"#s3\">The steam is the defrost<\/a><a href=\"#s4\">Where the water goes<\/a><a href=\"#s5\">When to call for service<\/a><a href=\"#s6\">In real cold, less frost<\/a><a href=\"#s7\">Frequently asked questions<\/a><\/nav>\n<\/div>\n<section id=\"s1\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">01<\/p>\n<h2>Why the coil frosts up<\/h2>\n<p>To take heat from the air, the outdoor coil has to be colder than the air. Air carries vapour, and the colder it is the less it can hold: one kilogram of air at +2 \u00b0C and 85% humidity contains 3.7 grams of water, but in contact with a coil at \u22125 \u00b0C it can hold only 2.5. The rest settles on the fins as frost. Why the fin spacing matters is explained in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-fin-spacing-defrost\/\" rel=\"noreferrer\">article on fins<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><picture><source media=\"(max-width: 767px)\" srcset=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-acqua-nell-aria-brina-en-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-acqua-nell-aria-brina-en.jpg\" class=\"lazyload\" alt=\"How much water a kilogram of saturated air carries, from \u221215 to +10 \u00b0C: below zero there is much less\" width=\"1400\" height=\"669\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-acqua-nell-aria-brina-en.jpg\" alt=\"How much water a kilogram of saturated air carries, from \u221215 to +10 \u00b0C: below zero there is much less\" width=\"1400\" height=\"669\" loading=\"lazy\"><\/noscript><\/picture><figcaption>How much water a kilogram of saturated air carries, from \u221215 to +10 \u00b0C: below zero there is much less.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s2\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">02<\/p>\n<h2>How much frost costs in output<\/h2>\n<p>A team from Aarhus University and the Danish Technological Institute calculated how much a coil loses as it frosts up with air at +2 \u00b0C: after one hour without defrosting, 9% of its output with air at 50% humidity, 34% with air at 85%. That is why the unit has to melt the frost, and when it does it matters: ours defrost when the coil is blocked, not on a timer, as we explain in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-timed-or-demand-defrost\/\" rel=\"noreferrer\">article on defrosting<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-brina-potenza-persa-en.jpg\" class=\"lazyload\" alt=\"With air at +2 \u00b0C, after one hour of frost the coil loses 9% of its output with dry air and 34% with humid air\" width=\"760\" height=\"536\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-brina-potenza-persa-en.jpg\" alt=\"With air at +2 \u00b0C, after one hour of frost the coil loses 9% of its output with dry air and 34% with humid air\" width=\"760\" height=\"536\" loading=\"lazy\"><\/noscript><figcaption>With air at +2 \u00b0C, after one hour of frost the coil loses 9% of its output with dry air and 34% with humid air.<\/figcaption><\/figure>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/batteria-pompa-di-calore-inverno-brina.jpg\" class=\"lazyload\" alt=\"The coil of one of our heat pumps in the snow: frost forms on the fins behind the grille\" width=\"1600\" height=\"1200\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/batteria-pompa-di-calore-inverno-brina.jpg\" alt=\"The coil of one of our heat pumps in the snow: frost forms on the fins behind the grille\" width=\"1600\" height=\"1200\" loading=\"lazy\"><\/noscript><figcaption>The coil of one of our heat pumps in the snow: frost forms on the fins behind the grille.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s3\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">03<\/p>\n<h2>The steam is the defrost<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>When it defrosts, the unit reverses its cycle for a few minutes: the coil warms up, the frost melts and part of it evaporates into the cold air. That is the white cloud you see rising while the fan is stopped. It is not smoke: nothing burns, it is water. When the defrost ends the fan restarts and the cloud disappears.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s4\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">04<\/p>\n<h2>Where the water goes<\/h2>\n<p>Defrost water drips from the tray under the unit, and on humid days there is a lot of it. It must go where it does not freeze or cause trouble: never onto a path or pavement, where in winter it turns into a sheet of ice; into a gravel soakaway below the ground&#8217;s frost depth, or into a drain where local rules allow, with the pipe protected from frost. The unit must be raised off the ground so snow does not block the coil and water can flow away. How it is installed is in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-installation\/\" rel=\"noreferrer\">article on installation<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-monoblocco-neve.jpg\" class=\"lazyload\" alt=\"Two of our heat pumps in the snow, raised off the ground: snow does not block the coil and water drains freely\" width=\"1600\" height=\"1200\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-monoblocco-neve.jpg\" alt=\"Two of our heat pumps in the snow, raised off the ground: snow does not block the coil and water drains freely\" width=\"1600\" height=\"1200\" loading=\"lazy\"><\/noscript><figcaption>Two of our heat pumps in the snow, raised off the ground: snow does not block the coil and water drains freely.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s5\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">05<\/p>\n<h2>When to call for service<\/h2>\n<p>Frost that comes and goes, steam for a few minutes and dripping water are normal operation. Worth checking are a coil that stays completely white for hours while the house cools down, steam all the time with the fan running, a block of ice growing under the unit and fan blades touching ice or snow. What is checked every year is in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-maintenance-servicing\/\" rel=\"noreferrer\">article on maintenance<\/a>.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-ghiaccio-normale-o-no-en.jpg\" class=\"lazyload\" alt=\"What is normal and what should be checked\" width=\"760\" height=\"906\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-ghiaccio-normale-o-no-en.jpg\" alt=\"What is normal and what should be checked\" width=\"760\" height=\"906\" loading=\"lazy\"><\/noscript><figcaption>What is normal and what should be checked.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s6\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">06<\/p>\n<h2>In real cold, less frost<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>It sounds odd, but the worst frost does not come with dry cold: at \u221210 \u00b0C one kilogram of air at 85% humidity carries 1.4 grams of water, less than half as much as at +2 \u00b0C. The hardest days are humid ones around zero, with fog or wet snow. How the unit works below zero is in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-cold-weather\/\" rel=\"noreferrer\">article on cold weather<\/a>. If you want an opinion on your installation, <a href=\"https:\/\/templari.com\/en\/contacts\/\" rel=\"noreferrer\">ask us for information<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s7\" class=\"sec faq\">\n<div class=\"wrap\">\n<div>\n<p class=\"num\">07<\/p>\n<h2>Frequently asked questions<\/h2>\n<\/div>\n<div>\n<details>\n<summary>Is it normal for a heat pump to ice up?<\/summary>\n<p>Yes: the outdoor coil works below zero and the moisture in the air settles on it as frost. The unit melts it with a defrost. It is not normal if the coil stays completely white for hours and the house cools down.<\/p>\n<\/details>\n<details>\n<summary>Why is my heat pump smoking?<\/summary>\n<p>It is not smoke, it is steam: during the defrost the coil warms up, the frost melts and part of it evaporates into the cold air. It lasts a few minutes, with the fan stopped.<\/p>\n<\/details>\n<details>\n<summary>Why is water coming out under the heat pump?<\/summary>\n<p>It is the melted frost from the defrost. It must drain into a gravel soakaway or a frost-protected drain, never onto a path.<\/p>\n<\/details>\n<details>\n<summary>Where does heat pump condensate drain?<\/summary>\n<p>Into a gravel soakaway below the frost depth, or into a drain where local rules allow, with the pipe protected from frost. Not onto pavements or paths, where it freezes.<\/p>\n<\/details>\n<details>\n<summary>When does a heat pump frost up most?<\/summary>\n<p>With humid air around zero, fog or wet snow. In dry cold the air carries little water and frost grows more slowly.<\/p>\n<\/details>\n<details>\n<summary>When should I call for service?<\/summary>\n<p>If the coil has been white for hours and the house is cooling down, if steam comes out even with the fan running, if a block of ice is growing under the unit or if the blades touch ice or snow.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"fine chiara\">\n<div class=\"wrap\">\n<p><small>Sources: <a href=\"https:\/\/doi.org\/10.1016\/j.ijrefrig.2023.10.018\" rel=\"noreferrer\" rel=\"nofollow\">Alvandifar, Krist\u00f3fersson, Forooghi, Frost formation non-uniformity in a multi-circuit V-shape evaporator, International Journal of Refrigeration 157 (2024)<\/a> \u00b7 WMO, Guide to Instruments and Methods of Observation (WMO-No. 8), Magnus<\/small><\/p>\n<p class=\"tpl-vedi-anche\"><strong>See also:<\/strong> <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-not-heating-problems\/\" rel=\"noreferrer\">Heat pump not heating or using too much electricity: the real causes and what to check<\/a><\/p>\n<p><em>All the technical tips are on the <a href=\"https:\/\/templari.com\/en\/technical-tips\/\" rel=\"noreferrer\">series page<\/a>.<\/em><\/p>\n<\/div>\n<\/section>\n<\/div>\n<p><script>(function(){var a=[].slice.call(document.querySelectorAll('#aa .subnav a')),n=document.querySelector('#aa .subnav'),h=document.getElementById('header-outer');function u(){if(n&&h)n.style.top=Math.max(0,h.getBoundingClientRect().bottom)+'px';var y=window.scrollY+200,c=null;a.forEach(function(l){var s=document.querySelector(l.getAttribute('href'));if(s&&s.offsetTop<=y)c=l});a.forEach(function(l){l.classList.toggle('on',l===c)});if(c&#038;&#038;c!==u.c){u.c=c;c.parentNode.scrollTo({left:c.offsetLeft-20,behavior:'smooth'})}}window.addEventListener('scroll',function(){u();setTimeout(u,400)},{passive:true});u()})();<\/script><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is it normal for a heat pump to ice up?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes: the outdoor coil works below zero and the moisture in the air settles on it as frost. The unit melts it with a defrost. It is not normal if the coil stays completely white for hours and the house cools down.\"}}, {\"@type\": \"Question\", \"name\": \"Why is my heat pump smoking?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is not smoke, it is steam: during the defrost the coil warms up, the frost melts and part of it evaporates into the cold air. It lasts a few minutes, with the fan stopped.\"}}, {\"@type\": \"Question\", \"name\": \"Why is water coming out under the heat pump?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is the melted frost from the defrost. It must drain into a gravel soakaway or a frost-protected drain, never onto a path.\"}}, {\"@type\": \"Question\", \"name\": \"Where does heat pump condensate drain?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Into a gravel soakaway below the frost depth, or into a drain where local rules allow, with the pipe protected from frost. Not onto pavements or paths, where it freezes.\"}}, {\"@type\": \"Question\", \"name\": \"When does a heat pump frost up most?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"With humid air around zero, fog or wet snow. In dry cold the air carries little water and frost grows more slowly.\"}}, {\"@type\": \"Question\", \"name\": \"When should I call for service?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"If the coil has been white for hours and the house is cooling down, if steam comes out even with the fan running, if a block of ice is growing under the unit or if the blades touch ice or snow.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical tips Heat pump with ice, steam or water underneath: what is normal and when to call for service In winter, heat pump owners see it do things a 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