{"id":17854,"date":"2026-10-24T13:14:56","date_gmt":"2026-10-24T11:14:56","guid":{"rendered":"https:\/\/templari.com\/high-temperature-heat-pump\/"},"modified":"2026-10-26T12:42:17","modified_gmt":"2026-10-26T11:42:17","slug":"high-temperature-heat-pump","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/","title":{"rendered":"High temperature heat pump: up to 70 \u00b0C, how much more it uses and when you really need it"},"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) .content-inner{max-width:none!important;width:100%!important;padding:0!important;margin:0!important;float:none!important}body:has(#aa) .comments-section{display:none}#aa{background:#000;color:#E9E8DD;font-family:Poppins,Arial,sans-serif;font-size:19px;line-height:1.7;-webkit-font-smoothing:antialiased}#aa *{box-sizing:border-box}#aa .hero{position:relative;min-height:58vh;display:flex;align-items:flex-end;background:#000 center\/cover no-repeat}#aa .hero:before{content:\"\";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.9) 0%,rgba(0,0,0,.6) 55%,rgba(0,0,0,.2) 100%),linear-gradient(0deg,#000 0%,rgba(0,0,0,0) 45%)}#aa .hero .in{position:relative;max-width:1160px;margin:0 auto;padding:120px 24px 44px;width:100%}#aa .badge{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:#0BABE4;border:1px solid rgba(11,171,228,.5);border-radius:999px;padding:6px 16px;margin-bottom:18px;background:rgba(0,0,0,.35);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}#aa h1{font-size:clamp(32px,4.4vw,52px);line-height:1.15;font-weight:700;color:#fff!important;margin:0 0 18px;max-width:20ch}#aa .lead{font-size:20px;color:#E9E8DD!important;max-width:62ch;margin:0}#aa .subnav{position:sticky;top:76px;z-index:20;display:flex;justify-content:center;padding:14px 12px;background:transparent;pointer-events:none}#aa .subnav nav{pointer-events:auto;display:flex;gap:6px;overflow-x:auto;max-width:100%;padding:6px;border-radius:999px;background:rgba(20,20,20,.72);border:1px solid rgba(255,255,255,.14);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);scrollbar-width:none}#aa .subnav a{white-space:nowrap;font-size:14px;font-weight:600;color:#E9E8DD!important;text-decoration:none!important;padding:8px 16px;border-radius:999px}#aa .subnav a.on,#aa .subnav a:hover{background:#0BABE4;color:#051822!important}#aa .sec{padding:52px 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 .chiara{background:#F5F4EE;color:#051822}#aa .chiara h2{color:#051822!important}#aa .chiara .num{color:#05587a}#aa .chiara p,#aa .chiara li{color:#1d2b33!important}#aa .chiara a{color:#05587a!important}#aa .chiara ul li:before{background:#05587a}#aa .chiara figure img{box-shadow:0 20px 44px rgba(5,24,34,.20)}#aa .chiara figcaption{color:#3C4F5A!important}#aa .chiara strong,#aa .chiara b{color:#051822}#aa table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:16px}#aa th,#aa td{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.14);text-align:left;color:inherit!important;background:transparent!important}#aa .chiara th,#aa .chiara td{border-color:rgba(5,24,34,.14)}#aa .faq .wrap{max-width:1160px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:40px}#aa details{border-bottom:1px solid rgba(255,255,255,.16);padding:18px 0}#aa .chiara details{border-color:rgba(5,24,34,.16)}#aa 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\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>High temperature heat pump: up to 70 \u00b0C, how much more it uses and when you really need it<\/h1>\n<p class=\"lead\">The high temperature heat pump is searched above all in Germany, 2,900 times a month, then in Poland (1,000), in Italy and the Netherlands (720), in Spain (590) and in France (480). Whoever searches for it almost always has a house with radiators and a boiler to replace, and wants to know whether a heat pump will deliver hot water like the boiler did. Our propane air-to-water units reach 70 \u00b0C. Here we explain what high temperature means, why the refrigerant makes the difference, what each extra degree costs and how many hours a year it is really needed. We cover radiators in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-with-radiators-does-it-work\/\" rel=\"noreferrer\">article on heat pumps with radiators<\/a>.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">What high temperature means<\/a><a href=\"#s2\">The refrigerant decides how high the water can go<\/a><a href=\"#s3\">Every extra degree costs<\/a><a href=\"#s4\">How hot the water really needs to be<\/a><a href=\"#s5\">The unit only goes up when needed<\/a><a href=\"#s6\">Domestic hot water and legionella<\/a><a href=\"#s7\">Before raising the temperature, look at the radiators<\/a><a href=\"#s8\">What to ask the installer<\/a><a href=\"#s9\">Frequently asked questions<\/a><\/nav>\n<\/div>\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>What high temperature means<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>The EU energy label tests heat pumps at two water temperatures: 35 \u00b0C, for underfloor heating, and 55 \u00b0C, for radiators (EU Regulation 813\/2013). With air at +7 \u00b0C, in the 55 \u00b0C test the water enters at 47 \u00b0C and leaves at 55 \u00b0C. A high temperature heat pump goes further: 65-70 \u00b0C and more, like a gas boiler. Our propane air-to-water units reach a flow temperature of 70 \u00b0C.<\/p>\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>The refrigerant decides how high the water can go<\/h2>\n<p>Every refrigerant has a critical temperature, above which it no longer condenses and the unit stops heating. For R32 it is 78.1 \u00b0C, and in practice it is used up to 55-60 \u00b0C; for propane, R290, it is 96.7 \u00b0C, and it is used even above 75 \u00b0C (CIBSE Journal, 2025). Our propane compressor condenses up to 82 \u00b0C: we stop the flow at 70 \u00b0C so that the compressor lasts. How a propane heat pump is built 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 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\/refrigerante-temperatura-critica-mandata-en-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/refrigerante-temperatura-critica-mandata-en.jpg\" class=\"lazyload\" alt=\"Critical temperature of R32 and propane, and the flow temperature used in practice\" width=\"1400\" height=\"509\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/refrigerante-temperatura-critica-mandata-en.jpg\" alt=\"Critical temperature of R32 and propane, and the flow temperature used in practice\" width=\"1400\" height=\"509\" loading=\"lazy\"><\/noscript><\/picture><figcaption>Critical temperature of R32 and propane, and the flow temperature used in practice.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s3\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">03<\/p>\n<h2>Every extra degree costs<\/h2>\n<p>A heat pump yields more the smaller the lift between the outdoor air and the water it has to make. With air at 2 \u00b0C, the maximum theoretical efficiency, that of the Carnot cycle, with water at 55 \u00b0C is 66% of that with water at 35 \u00b0C; at 70 \u00b0C it drops to 54%. Real units follow the same path: the rule of thumb is 1.5 to 3% less for every extra degree (CIBSE Journal, 2023). On the Kita X data sheet, the SCOP, the efficiency over the whole winter, goes from 5.61 with water at 35 \u00b0C to 4.39 at 55 \u00b0C: 22% less. That is why high temperature is a reserve for the coldest days, not the normal way of working.<\/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\/rendimento-carnot-temperatura-mandata-en.jpg\" class=\"lazyload\" alt=\"The heat pump&#039;s maximum theoretical efficiency as the water temperature rises, with outdoor air at 2 \u00b0C\" width=\"760\" height=\"1264\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/rendimento-carnot-temperatura-mandata-en.jpg\" alt=\"The heat pump&#039;s maximum theoretical efficiency as the water temperature rises, with outdoor air at 2 \u00b0C\" width=\"760\" height=\"1264\" loading=\"lazy\"><\/noscript><figcaption>The heat pump&#8217;s maximum theoretical efficiency as the water temperature rises, with outdoor air at 2 \u00b0C.<\/figcaption><\/figure>\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>How hot the water really needs to be<\/h2>\n<p>Fraunhofer ISE measured 77 heat pumps for four years in existing houses built between 1826 and 2001. The flow water averaged 38.2 \u00b0C; the average maximum was 48.6 \u00b0C. In houses with radiators only, the average maximum rose to 63.9 \u00b0C, but the yearly average stayed at 38.5 \u00b0C; the highest value measured was 68.3 \u00b0C. At -10 \u00b0C outside, most radiator systems stayed below 55 \u00b0C. In England a government study of real homes found that, without changing radiators, 55 \u00b0C is enough for 53% of homes on an average day of the coldest month, but for only 10% on the peak day. It means very hot water is needed a few hours a year, on the coldest days: that is where a unit that reaches 70 \u00b0C counts.<\/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\/temperature-mandata-misurate-case-esistenti-en-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/temperature-mandata-misurate-case-esistenti-en.jpg\" class=\"lazyload\" alt=\"Water temperatures measured by Fraunhofer ISE in 77 existing homes, and the 70 \u00b0C of our propane air-to-water units\" width=\"1400\" height=\"482\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/temperature-mandata-misurate-case-esistenti-en.jpg\" alt=\"Water temperatures measured by Fraunhofer ISE in 77 existing homes, and the 70 \u00b0C of our propane air-to-water units\" width=\"1400\" height=\"482\" loading=\"lazy\"><\/noscript><\/picture><figcaption>Water temperatures measured by Fraunhofer ISE in 77 existing homes, and the 70 \u00b0C of our propane air-to-water units.<\/figcaption><\/figure>\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>The unit only goes up when needed<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>A well-made heat pump does not keep the water at 70 \u00b0C all winter. With a heating curve the water temperature follows the outdoor temperature and rises only when it is cold outside, as we explain in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-heating-curve-weather-compensation\/\" rel=\"noreferrer\">article on the heating curve<\/a>. With HCC the unit looks at room temperature and works on time: more hours with low water temperature instead of a few hours with high. That way 65-70 \u00b0C is rarely needed. Why a heat pump should not be controlled like a boiler is in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-is-not-a-boiler-hcc\/\" rel=\"noreferrer\">article on HCC<\/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>Domestic hot water and legionella<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>High temperature is also needed for hot water. The Italian legionella guidelines require at least 60 \u00b0C in storage tanks, and between the unit&#8217;s flow and the water in the cylinder there are about 4 degrees: 60 \u00b0C in the cylinder takes a 64 \u00b0C flow, which a unit capped at 55 \u00b0C cannot give. With 70 \u00b0C our heat pump gets there without an electric heater. We cover it on the <a href=\"https:\/\/templari.com\/en\/heat-pump-water-heater\/\" rel=\"noreferrer\">page on domestic hot water<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s7\" class=\"sec duo\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">07<\/p>\n<h2>Before raising the temperature, look at the radiators<\/h2>\n<p>A radiator heats the room with the difference between its water and the air: the bigger it is, the less hot the water needs to be. Old houses often have large radiators, fitted when windows were single-glazed; after replacing the windows or insulating the roof, those same radiators are enough with cooler water. Before deciding how high the unit must go, it is worth a winter test with the boiler at a lower temperature, and replacing only the radiator in the room that stays cold. We explain it in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-old-house\/\" rel=\"noreferrer\">article on old houses<\/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\/termosifone-ghisa-casa-epoca-commons.jpg\" class=\"lazyload\" alt=\"A cast iron radiator in a period house: with the boiler it ran at 70-80 \u00b0C, with a heat pump less is often enough\" width=\"1400\" height=\"933\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/termosifone-ghisa-casa-epoca-commons.jpg\" alt=\"A cast iron radiator in a period house: with the boiler it ran at 70-80 \u00b0C, with a heat pump less is often enough\" width=\"1400\" height=\"933\" loading=\"lazy\"><\/noscript><figcaption>A cast iron radiator in a period house: with the boiler it ran at 70-80 \u00b0C, with a heat pump less is often enough. <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:Radiator_Kerguehennec_01.jpg\" rel=\"noreferrer\" rel=\"nofollow\">Photo: Schorle, Wikimedia Commons<\/a> (<a href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/\" rel=\"noreferrer\" rel=\"nofollow\">CC BY-SA 4.0<\/a>)<\/figcaption><\/figure>\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>What to ask the installer<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Five questions. What temperature the unit reaches with the compressor alone, without an electric heater. With which refrigerant. What temperature it will run at on normal days and on the coldest ones, that is how the heating curve is set. How it makes hot water at 60 \u00b0C. And who checked whether the radiators are big enough. If you want an opinion on your house, <a href=\"https:\/\/templari.com\/en\/contacts\/\" rel=\"noreferrer\">ask us for information<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s9\" class=\"sec faq\">\n<div class=\"wrap\">\n<div>\n<p class=\"num\">09<\/p>\n<h2>Frequently asked questions<\/h2>\n<\/div>\n<div>\n<details>\n<summary>What is a high temperature heat pump?<\/summary>\n<p>It is a heat pump that heats water above the 55 \u00b0C of the EU radiator test, up to 65-70 \u00b0C and more, like a boiler. Our propane air-to-water units reach a flow temperature of 70 \u00b0C.<\/p>\n<\/details>\n<details>\n<summary>How hot can a propane heat pump go?<\/summary>\n<p>Propane has a critical temperature of 96.7 \u00b0C and is used even above 75 \u00b0C. Our compressor condenses up to 82 \u00b0C; we limit the flow to 70 \u00b0C so that the compressor lasts.<\/p>\n<\/details>\n<details>\n<summary>How much more does a heat pump use at 70 \u00b0C?<\/summary>\n<p>With air at 2 \u00b0C the theoretical efficiency at 70 \u00b0C is 54% of that at 35 \u00b0C. But water that hot is needed only a few hours a year: in the existing homes measured by Fraunhofer ISE the average flow was 38.2 \u00b0C.<\/p>\n<\/details>\n<details>\n<summary>Do radiators need a high temperature heat pump?<\/summary>\n<p>On the coldest days often yes. Fraunhofer ISE measured an average maximum of 63.9 \u00b0C in homes with radiators only, with a yearly average of 38.5 \u00b0C. That is why it matters that the unit reaches 70 \u00b0C, but goes there only when needed.<\/p>\n<\/details>\n<details>\n<summary>Is R32 or R290 better for high temperature?<\/summary>\n<p>Propane: its critical temperature is 96.7 \u00b0C against 78.1 \u00b0C for R32, which in practice is used up to 55-60 \u00b0C.<\/p>\n<\/details>\n<details>\n<summary>Can a heat pump make hot water at 60 \u00b0C against legionella?<\/summary>\n<p>Yes, if it reaches at least a 64 \u00b0C flow, because there are about 4 degrees between flow and cylinder. Our propane units reach 70 \u00b0C without an electric heater.<\/p>\n<\/details>\n<details>\n<summary>Do I have to replace my radiators for a heat pump?<\/summary>\n<p>Not necessarily. First run a winter test with the boiler at a lower temperature: often it is enough to replace the radiator in the room that stays cold.<\/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:\/\/www.ise.fraunhofer.de\/content\/dam\/ise\/de\/documents\/projekte\/WP-QS_Schlussbericht.pdf\" rel=\"noreferrer\" rel=\"nofollow\">Fraunhofer ISE, WP-QS im Bestand<\/a> \u00b7 <a href=\"https:\/\/www.cibsejournal.com\/?p=32415\" rel=\"noreferrer\" rel=\"nofollow\">CIBSE Journal, CPD Module 246<\/a> \u00b7 <a href=\"https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/976020\/beis-dhds-executive-summary__1_.pdf\" rel=\"noreferrer\" rel=\"nofollow\">BEIS, Electrification of Heat Demand Side, 2021<\/a><\/small><\/p>\n<p class=\"tpl-vedi-anche\"><strong>See also:<\/strong> <a href=\"https:\/\/templari.com\/en\/heat-pump-block-of-flats\/\" rel=\"noreferrer\">Heat pump for a block of flats: communal or one per flat, output, hot water and where it goes<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-or-pellet-boiler\/\" rel=\"noreferrer\">Heat pump or pellet boiler: efficiency, space, fine dust and maintenance compared<\/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\": \"What is a high temperature heat pump?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is a heat pump that heats water above the 55 \\u00b0C of the EU radiator test, up to 65-70 \\u00b0C and more, like a boiler. Our propane air-to-water units reach a flow temperature of 70 \\u00b0C.\"}}, {\"@type\": \"Question\", \"name\": \"How hot can a propane heat pump go?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Propane has a critical temperature of 96.7 \\u00b0C and is used even above 75 \\u00b0C. Our compressor condenses up to 82 \\u00b0C; we limit the flow to 70 \\u00b0C so that the compressor lasts.\"}}, {\"@type\": \"Question\", \"name\": \"How much more does a heat pump use at 70 \\u00b0C?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"With air at 2 \\u00b0C the theoretical efficiency at 70 \\u00b0C is 54% of that at 35 \\u00b0C. But water that hot is needed only a few hours a year: in the existing homes measured by Fraunhofer ISE the average flow was 38.2 \\u00b0C.\"}}, {\"@type\": \"Question\", \"name\": \"Do radiators need a high temperature heat pump?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"On the coldest days often yes. Fraunhofer ISE measured an average maximum of 63.9 \\u00b0C in homes with radiators only, with a yearly average of 38.5 \\u00b0C. That is why it matters that the unit reaches 70 \\u00b0C, but goes there only when needed.\"}}, {\"@type\": \"Question\", \"name\": \"Is R32 or R290 better for high temperature?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Propane: its critical temperature is 96.7 \\u00b0C against 78.1 \\u00b0C for R32, which in practice is used up to 55-60 \\u00b0C.\"}}, {\"@type\": \"Question\", \"name\": \"Can a heat pump make hot water at 60 \\u00b0C against legionella?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, if it reaches at least a 64 \\u00b0C flow, because there are about 4 degrees between flow and cylinder. Our propane units reach 70 \\u00b0C without an electric heater.\"}}, {\"@type\": \"Question\", \"name\": \"Do I have to replace my radiators for a heat pump?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Not necessarily. First run a winter test with the boiler at a lower temperature: often it is enough to replace the radiator in the room that stays cold.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical tips High temperature heat pump: up to 70 \u00b0C, how much more it uses and when you really need it The high temperature heat pump is searched above all&#8230;<\/p>\n","protected":false},"author":3,"featured_media":14058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","footnotes":""},"categories":[201],"tags":[],"class_list":["post-17854","post","type-post","status-publish","format-standard","has-post-thumbnail","category-technical-tips"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>High temperature heat pump: up to 70 \u00b0C | Templari<\/title>\n<meta name=\"description\" content=\"The high temperature heat pump: why propane reaches 70 \u00b0C, what each extra degree costs, and how hot the water really needs to be in existing homes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"High temperature heat pump: up to 70 \u00b0C | Templari\" \/>\n<meta property=\"og:description\" content=\"The high temperature heat pump: why propane reaches 70 \u00b0C, what each extra degree costs, and how hot the water really needs to be in existing homes.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/\" \/>\n<meta property=\"og:site_name\" content=\"Templari\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-24T11:14:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-26T11:42:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"640\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Templari Admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Templari Admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"High temperature heat pump: up to 70 \u00b0C | Templari","description":"The high temperature heat pump: why propane reaches 70 \u00b0C, what each extra degree costs, and how hot the water really needs to be in existing homes.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/","og_locale":"en_US","og_type":"article","og_title":"High temperature heat pump: up to 70 \u00b0C | Templari","og_description":"The high temperature heat pump: why propane reaches 70 \u00b0C, what each extra degree costs, and how hot the water really needs to be in existing homes.","og_url":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/","og_site_name":"Templari","article_published_time":"2026-10-24T11:14:56+00:00","article_modified_time":"2026-10-26T11:42:17+00:00","og_image":[{"width":1600,"height":640,"url":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg","type":"image\/jpeg"}],"author":"Templari Admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Templari Admin","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#article","isPartOf":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/"},"author":{"name":"Templari Admin","@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57"},"headline":"High temperature heat pump: up to 70 \u00b0C, how much more it uses and when you really need it","datePublished":"2026-10-24T11:14:56+00:00","dateModified":"2026-10-26T11:42:17+00:00","mainEntityOfPage":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/"},"wordCount":1359,"image":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#primaryimage"},"thumbnailUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg","articleSection":["Technical tips"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/","url":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/","name":"High temperature heat pump: up to 70 \u00b0C | Templari","isPartOf":{"@id":"https:\/\/templari.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#primaryimage"},"image":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#primaryimage"},"thumbnailUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg","datePublished":"2026-10-24T11:14:56+00:00","dateModified":"2026-10-26T11:42:17+00:00","author":{"@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57"},"description":"The high temperature heat pump: why propane reaches 70 \u00b0C, what each extra degree costs, and how hot the water really needs to be in existing homes.","breadcrumb":{"@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#primaryimage","url":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg","contentUrl":"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p16-kita-x-pompa-di-calore-ibrido-2-5.jpg","width":1600,"height":640,"caption":"Kita X propane monobloc air-to-water heat pump installed next to a modern house"},{"@type":"BreadcrumbList","@id":"https:\/\/templari.com\/en\/news\/high-temperature-heat-pump\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/templari.com\/en\/"},{"@type":"ListItem","position":2,"name":"High temperature heat pump: up to 70 \u00b0C, how much more it uses and when you really need it"}]},{"@type":"Person","@id":"https:\/\/templari.com\/en\/#\/schema\/person\/48abcdf90f9b7b3bd2227e6d67fc2a57","name":"Templari Admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9f5f0005755bddc0e66d18c21bde62cb7ac725c3e4a3cb7dcbdf3c1cfce63f21?s=96&d=mm&r=g","caption":"Templari Admin"}}]}},"permalink_manager":null,"_links":{"self":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts\/17854","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/comments?post=17854"}],"version-history":[{"count":0,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/posts\/17854\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/media\/14058"}],"wp:attachment":[{"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/media?parent=17854"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/categories?post=17854"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/templari.com\/en\/wp-json\/wp\/v2\/tags?post=17854"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}