{"id":14704,"date":"2026-10-23T19:14:46","date_gmt":"2026-10-23T17:14:46","guid":{"rendered":"https:\/\/templari.com\/best-air-to-water-heat-pumps\/"},"modified":"2026-10-26T15:43:48","modified_gmt":"2026-10-26T14:43:48","slug":"best-air-to-water-heat-pumps","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/best-air-to-water-heat-pumps\/","title":{"rendered":"Best air source heat pump: the 10 things to check before you buy"},"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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0;scroll-margin-top:150px}#aa .wrap{max-width:820px;margin:0 auto;padding:0 24px}#aa .num{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#0BABE4;margin:0 0 6px}#aa h2{font-size:clamp(28px,3.2vw,38px);line-height:1.2;font-weight:700;color:#fff!important;margin:0 0 18px}#aa p,#aa li{color:#E9E8DD!important;font-size:19px}#aa p{margin:0 0 18px}#aa a{color:#45E3FF!important;text-decoration:underline;text-underline-offset:3px}#aa ul,#aa ol{margin:0 0 18px;padding:0;list-style:none}#aa li{position:relative;padding-left:28px;margin:0 0 10px}#aa ul li:before{content:\"\";position:absolute;left:4px;top:.72em;width:9px;height:9px;border-radius:50%;background:#0BABE4}#aa figure{margin:30px 0}#aa figure img{display:block;width:auto;max-width:100%;max-height:600px;height:auto;margin:0 auto;border-radius:22px;box-shadow:0 22px 48px rgba(0,0,0,.45)}#aa figcaption{font-size:15px!important;line-height:1.5;color:#B9C6CC!important;margin-top:12px;text-align:left}#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\/migliore-pompa-di-calore-aria-acqua-casa-neve.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>Best air source heat pump: the 10 things to check before you buy<\/h1>\n<p class=\"lead\">The best air-to-water heat pump is the one that heats your home in January, in fog, at low cost and without stopping. The highest COP in the catalogue does not guarantee that on its own. In this guide we list what to check before you buy, in the order a heating engineer checks it. Almost every point links to the article that explains it in depth.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">1. Output at -7 \u00b0C, not the rated output<\/a><a href=\"#s2\">2. COP with the conditions next to it<\/a><a href=\"#s3\">3. SCOP at 35 and 55 \u00b0C<\/a><a href=\"#s4\">4. The outdoor coil and defrost<\/a><a href=\"#s5\">5. Weight<\/a><a href=\"#s6\">6. How hot the water gets<\/a><a href=\"#s7\">7. Refrigerant<\/a><a href=\"#s8\">8. Sizing<\/a><a href=\"#s9\">9. Noise, with the distance<\/a><a href=\"#s10\">10. Who installs it and who looks after it<\/a><a href=\"#s11\">In short<\/a><a href=\"#s12\">Frequently asked questions<\/a><\/nav>\n<\/div>\n<section class=\"sec chiara\">\n<div class=\"wrap\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/migliore-pompa-di-calore-10-punti-en-scaled.jpg\" alt=\"The 10 things to check before you buy\" width=\"1400\" height=\"628\" loading=\"lazy\" \/><figcaption>The 10 things to check before you buy.<\/figcaption><\/figure>\n<\/div>\n<\/section>\n<section id=\"s1\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">01<\/p>\n<h2>1. Output at -7 \u00b0C, not the rated output<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>The big number on the datasheet is measured with +7 \u00b0C outside. When it is cold the unit delivers less: on our air-to-water units, on average, 76% of the rated output is left at -7 \u00b0C. Choose the unit on the output left on the coldest day, not on the rated figure: we explain it in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-rated-and-useful-capacity\/\" rel=\"noreferrer\">article on useful output<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s2\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">02<\/p>\n<h2>2. COP with the conditions next to it<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>A COP without the air and water temperatures next to it tells you nothing. At +7 \u00b0C with water at 35 \u00b0C a good unit reaches COP 7 and more; at -7 \u00b0C with radiators at 55 \u00b0C even an excellent unit sits between COP 2.5 and COP 3. Two units can only be compared under the same conditions. How it is measured and why it changes in fog is in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-cop-scop-eer\/\" rel=\"noreferrer\">article on COP<\/a>.<\/p>\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>3. SCOP at 35 and 55 \u00b0C<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>SCOP is the average over the whole winter and sets the energy class. Read it at 35 \u00b0C if you have underfloor heating, at 55 \u00b0C if you have radiators. For one of our 8 kW air-to-water units the HP Keymark certification gives SCOP 5.75 at 35 \u00b0C and SCOP 4.20 at 55 \u00b0C. A figure certified by an independent laboratory is worth more than a catalogue one.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s4\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">04<\/p>\n<h2>4. The outdoor coil and defrost<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>In winter the coil frosts up and the unit has to defrost: during those minutes it uses power without heating. Widely spaced fins (2.5 mm on ours), a large surface and a defrost that starts when needed, not on a timer, make the difference between the laboratory COP and the January one. See the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-fin-spacing-defrost\/\" rel=\"noreferrer\">article on fins<\/a> and the one <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-timed-or-demand-defrost\/\" rel=\"noreferrer\">on defrost<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s5\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">05<\/p>\n<h2>5. Weight<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Weight tells you how much coil, copper and heat exchanger there is inside. An air-to-water heat pump built for winter weighs 180-220 kg; an air conditioning split 60-120. For the same output, the lighter unit usually has the smaller coil. It is the subject of the <a href=\"https:\/\/templari.com\/en\/news\/air-conditioner-or-heat-pump-difference\/\" rel=\"noreferrer\">article on air conditioners and heat pumps<\/a>.<\/p>\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>6. How hot the water gets<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Radiators need hot water: our air-to-water units reach 70 \u00b0C without electric heaters, for domestic hot water too. A unit that reaches 55 \u00b0C is fine with underfloor heating; with old radiators it may not be enough. We cover it in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-with-radiators-does-it-work\/\" rel=\"noreferrer\">article on radiators<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s7\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">07<\/p>\n<h2>7. Refrigerant<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Propane R290 is a natural gas with almost no climate impact and outside the F-Gas obligations: no periodic leak checks, no logbook. It works well at high water temperatures and goes into <a href=\"https:\/\/templari.com\/en\/monobloc-heat-pump\/\" rel=\"noreferrer\">monobloc<\/a> units, with all the gas outside the home. How it is built inside is explained in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-r290-how-it-is-built\/\" rel=\"noreferrer\">article on R290<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s8\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">08<\/p>\n<h2>8. Sizing<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>A heat pump that is too big keeps starting and stopping, uses more and lasts less; one that is too small cannot cope in winter. The right size comes from the heat loss calculation of the house. With an inverter the unit then runs at half output for most of the season, where it is most efficient: that is the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-inverter-sizing-half-capacity\/\" rel=\"noreferrer\">article on sizing<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s9\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">09<\/p>\n<h2>9. Noise, with the distance<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>A decibel figure without a distance cannot be compared. Look at the sound pressure at 1 or 5 metres, and at where the unit will go: away from bedrooms, not shut in a corner.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s10\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">10<\/p>\n<h2>10. Who installs it and who looks after it<\/h2>\n<p>A good unit installed badly performs like a mediocre one. What counts is who installs it, who does the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-maintenance-servicing\/\" rel=\"noreferrer\">maintenance<\/a> and whether you can read the efficiency. Ours are monitored remotely and the real COP is shown on the display.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p4-pannello-comando-pompa-di-calore-casa-2-5.jpg\" alt=\"The HCC wall panel with flow, hot water and system temperatures: efficiency is not promised, it is read\" width=\"1448\" height=\"579\" loading=\"lazy\" \/><figcaption>The HCC wall panel with flow, hot water and system temperatures: efficiency is not promised, it is read.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s11\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">11<\/p>\n<h2>In short<\/h2>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-table\">\n<table style=\"border-collapse:collapse;width:100%;max-width:720px\">\n<thead>\n<tr>\n<th style=\"background:#e9edf2;color:#222;padding:8px 10px;border:1px solid #c9ced6;text-align:left;font-weight:600\">What to check<\/th>\n<th style=\"background:#e9edf2;color:#222;padding:8px 10px;border:1px solid #c9ced6;text-align:left;font-weight:600\">Why<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Output at -7 \u00b0C<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">it is the output on the coldest day<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">COP and SCOP with conditions<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">without conditions they cannot be compared<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Coil and defrost<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">they decide the COP in fog<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Weight<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">it tells you what is inside<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Maximum water temperature<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">needed with radiators<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Refrigerant<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">R290: no F-Gas obligations<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Sizing<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">neither too big nor too small<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Noise at a stated distance<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">dB without metres mean nothing<\/td>\n<\/tr>\n<tr>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">Installer and service<\/td>\n<td style=\"background:#ffffff;color:#222;padding:8px 10px;border:1px solid #c9ced6\">a good unit installed badly performs poorly<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s12\" class=\"sec faq chiara\">\n<div class=\"wrap\">\n<div>\n<p class=\"num\">12<\/p>\n<h2>Frequently asked questions<\/h2>\n<\/div>\n<div>\n<details>\n<summary>What is the best air-to-water heat pump?<\/summary>\n<p>The one that still has the output your home needs at -7 \u00b0C, with a COP certified at your system&#8217;s conditions, a coil built for winter and an installer who sizes it on the calculation.<\/p>\n<\/details>\n<details>\n<summary>Is a bigger or a smaller heat pump better?<\/summary>\n<p>The right size, chosen on the heat loss calculation. Too big and it keeps starting and stopping; too small and it is not enough in winter.<\/p>\n<\/details>\n<details>\n<summary>What COP should a good heat pump have?<\/summary>\n<p>It depends on the conditions: COP 7 and more at +7 \u00b0C with water at 35 \u00b0C, between COP 2.5 and COP 3 at -7 \u00b0C with water at 55 \u00b0C. Compare the certified SCOP at the water temperature of your system.<\/p>\n<\/details>\n<details>\n<summary>Does an air-to-water heat pump work with radiators?<\/summary>\n<p>Yes, if it reaches the temperatures needed: ours reach 70 \u00b0C.<\/p>\n<\/details>\n<details>\n<summary>R32 or R290?<\/summary>\n<p>For a new monobloc air-to-water unit, R290: a natural gas, outside the F-Gas obligations, good at high water temperatures.<\/p>\n<\/details>\n<details>\n<summary>How much does an air-to-water heat pump weigh?<\/summary>\n<p>One built for winter weighs 180-220 kg. The weight tells you how much coil and heat exchanger there is inside.<\/p>\n<\/details>\n<details>\n<summary>How many m\u00b2 does an air-to-water heat pump heat?<\/summary>\n<p>It depends on how much heat the house loses, not on the m\u00b2. As an order of magnitude, on the coldest day an A or B class house needs 25-40 W\/m\u00b2, a renovated house 50-70 W\/m\u00b2, a house built before 1990 and never insulated 80-120 W\/m\u00b2. A renovated 150 m\u00b2 house therefore needs about 8-10 kW. The real figure comes from the heat loss calculation.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"fine\">\n<div class=\"wrap\">\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<\/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\": \"What is the best air-to-water heat pump?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The one that still has the output your home needs at -7 \\u00b0C, with a COP certified at your system's conditions, a coil built for winter and an installer who sizes it on the calculation.\"}}, {\"@type\": \"Question\", \"name\": \"Is a bigger or a smaller heat pump better?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The right size, chosen on the heat loss calculation. Too big and it keeps starting and stopping; too small and it is not enough in winter.\"}}, {\"@type\": \"Question\", \"name\": \"What COP should a good heat pump have?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It depends on the conditions: COP 7 and more at +7 \\u00b0C with water at 35 \\u00b0C, between COP 2.5 and COP 3 at -7 \\u00b0C with water at 55 \\u00b0C. Compare the certified SCOP at the water temperature of your system.\"}}, {\"@type\": \"Question\", \"name\": \"Does an air-to-water heat pump work with radiators?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, if it reaches the temperatures needed: ours reach 70 \\u00b0C.\"}}, {\"@type\": \"Question\", \"name\": \"R32 or R290?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"For a new monobloc air-to-water unit, R290: a natural gas, outside the F-Gas obligations, good at high water temperatures.\"}}, {\"@type\": \"Question\", \"name\": \"How much does an air-to-water heat pump weigh?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One built for winter weighs 180-220 kg. The weight tells you how much coil and heat exchanger there is inside.\"}}, {\"@type\": \"Question\", \"name\": \"How many m\\u00b2 does an air-to-water heat pump heat?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It depends on how much heat the house loses, not on the m\\u00b2. As an order of magnitude, on the coldest day an A or B class house needs 25-40 W\/m\\u00b2, a renovated house 50-70 W\/m\\u00b2, a house built before 1990 and never insulated 80-120 W\/m\\u00b2. A renovated 150 m\\u00b2 house therefore needs about 8-10 kW. The real figure comes from the heat loss calculation.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical tips Best air source heat pump: the 10 things to check before you buy The best air-to-water heat pump is the one that heats your home in January, in&#8230;<\/p>\n","protected":false},"author":3,"featured_media":14689,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","footnotes":""},"categories":[46,201],"tags":[],"class_list":["post-14704","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news-en","category-technical-tips"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Best air to water heat pump: 10 things to check | Templari<\/title>\n<meta name=\"description\" content=\"Best air to water heat pump: 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