{"id":13890,"date":"2026-10-22T22:10:37","date_gmt":"2026-10-22T20:10:37","guid":{"rendered":"https:\/\/templari.com\/heat-pump-and-photovoltaics\/"},"modified":"2026-10-26T12:40:39","modified_gmt":"2026-10-26T11:40:39","slug":"heat-pump-and-photovoltaics","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/heat-pump-and-photovoltaics\/","title":{"rendered":"Heat pump and solar panels: how much the roof really covers, month by month, and how to make them work together"},"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\/p15-pompa-di-calore-fotovoltaico-tetto-2-5.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>Heat pump and solar panels: how much the roof really covers, month by month, and how to make them work together<\/h1>\n<p class=\"lead\">A heat pump and photovoltaics go together for a simple reason: the machine uses electricity and the roof makes it. But heating is needed in winter, when the roof makes less, and in the evening, when there is no sun. Anyone promising a zero bill skips this step. Here are the real figures, month by month, and the three ways to make the two work together.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">How much a roof produces, month by month<\/a><a href=\"#s2\">How much the heat pump asks for, and when<\/a><a href=\"#s3\">The real problem is the hours, not the kWh<\/a><a href=\"#s4\">How many kW of photovoltaics for a heat pump<\/a><a href=\"#s5\">In winter the sun helps twice<\/a><a href=\"#s6\">In summer the sum works out by itself<\/a><a href=\"#s7\">And in an industrial building<\/a><a href=\"#s8\">What to ask whoever proposes it<\/a><a href=\"#s9\">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>How much a roof produces, month by month<\/h2>\n<p>Take a 6 kWp system, the most common size on a house. In Padua, with the right tilt and orientation, it produces about 8,000 kWh a year (PVGIS data from the European Commission&#8217;s research centre). But not evenly: 919 kWh in July and 391 in December, less than half. In Bolzano the figures are almost the same, in Rome December is worth 514. In mid-winter a 6 kWp roof in the Po valley gives on average 13 kWh a day, and gives them between ten in the morning and three in the afternoon.<\/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\/produzione-fotovoltaico-mensile-6-kwp-en-telefono.png\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/produzione-fotovoltaico-mensile-6-kwp-en.png\" class=\"lazyload\" alt=\"Monthly output of a 6 kWp photovoltaic system in Padua, Bolzano and Rome, optimal tilt and orientation. Source: PVGIS, European Commission\" width=\"1672\" height=\"941\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/produzione-fotovoltaico-mensile-6-kwp-en.png\" alt=\"Monthly output of a 6 kWp photovoltaic system in Padua, Bolzano and Rome, optimal tilt and orientation. Source: PVGIS, European Commission\" width=\"1672\" height=\"941\" loading=\"lazy\"><\/noscript><\/picture><figcaption>Monthly output of a 6 kWp photovoltaic system in Padua, Bolzano and Rome, optimal tilt and orientation. Source: PVGIS, European Commission.<\/figcaption><\/figure>\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>How much the heat pump asks for, and when<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>We lined up the consumption figures in the <a href=\"https:\/\/templari.com\/en\/news\/how-much-electricity-does-a-heat-pump-use\/\" rel=\"noreferrer\">tip on consumption<\/a>: a Kita SP 10, HP Keymark certified, in a year of average European climate uses 2,999 kWh with underfloor heating and 3,881 with radiators, almost all between November and March. On a +7 \u00b0C day it asks for about 14 kWh, on a +2 \u00b0C day about 20. Next to the 13 kWh a day the roof makes in December, the point is clear: in winter the roof covers part of the heating, not all of it. Over the whole year the sum changes, because in spring, in autumn and for summer hot water the roof produces far more than the heat pump asks for.<\/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>The real problem is the hours, not the kWh<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>The sun produces at midday; the house asks for heat mostly in the evening and at night. Without shifting anything, the roof electricity the heat pump really uses is a fraction of what is produced, and the rest goes to the grid for little. To shift the work into the sunny hours there are three possible stores. The electric battery: it works, but costs ten to twenty thousand euros. Water: the hot water cylinder is heated at midday with the sun and the hot water is there in the evening. The walls of the house: that is what the HCC <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-energy-optimiser-thermal-storage\/\" rel=\"noreferrer\">energy optimiser<\/a> does, heating a little beyond the set point in the sunny hours, putting the heat into walls and screeds and letting them give it back in the evening. It is worth one or two COP points over the season and it is not bought: it is the house.<\/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>How many kW of photovoltaics for a heat pump<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>There is no magic number, but the sum takes three steps.<\/p>\n<ol>\n<li>Start from the house&#8217;s electricity use without the heat pump: in Italy the typical family is around 2,700 kWh a year.<\/li>\n<li>Add the heat pump: for a house that today burns 1,200 cubic metres of gas, 2,400-2,600 kWh with radiators, 1,800-1,900 with underfloor heating (the sum is in the tip on consumption). In all 4,500-5,300 kWh a year.<\/li>\n<li>A 6 kWp roof produces 8,000: on paper it covers everything. But the annual balance is not self-consumption: without storage the house uses directly part of what it produces and exchanges the rest with the grid. With a cylinder and the optimiser the share used rises; with a battery it rises further.<\/li>\n<li>It makes no sense to enlarge the roof to cover January: in December a double system would make 26 kWh a day instead of 13 and for the rest of the year would give electricity away to the grid. Better 6 kWp sized on consumption and good storage.<\/li>\n<\/ol>\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>In winter the sun helps twice<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>In the sunny hours the outdoor air is warmer, and the heat pump performs better: the SP 10 at part load has a COP of 7.64 at +7 \u00b0C and COP 3.59 at -7 \u00b0C. When the roof produces, the machine produces heat with less electricity. The energy optimiser exploits exactly this coincidence: it makes the heat pump work in the hours when the sun is out and the air is mild, and lets the machine rest at night, when the COP is worse and the roof is off.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s6\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">06<\/p>\n<h2>In summer the sum works out by itself<\/h2>\n<p>Cooling is the perfect case: it is hot when the sun is out, that is when the roof produces. The same SP 10 with underfloor or fan coils at 18 \u00b0C water has an EER of 5.43: every kWh from the roof becomes more than five of cooling. In the same hours the domestic hot water is heated. In summer a house with photovoltaics and a heat pump uses almost only the roof&#8217;s electricity.<\/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-neve-casa-svizzera.jpg\" class=\"lazyload\" alt=\"House in Switzerland after a snowfall: on days like this the roof produces little and storage makes the difference; the heat pump works all the same\" width=\"1600\" height=\"1200\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/pompa-di-calore-neve-casa-svizzera.jpg\" alt=\"House in Switzerland after a snowfall: on days like this the roof produces little and storage makes the difference; the heat pump works all the same\" width=\"1600\" height=\"1200\" loading=\"lazy\"><\/noscript><figcaption>House in Switzerland after a snowfall: on days like this the roof produces little and storage makes the difference; the heat pump works all the same.<\/figcaption><\/figure>\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>And in an industrial building<\/h2>\n<p>In an industrial building the picture turns in favour of photovoltaics: work is done during the day, machines and climate control consume when the roof produces, and the roof is large. As an order of magnitude you need 500-600 square metres of roof for every 100 kWp, as we explain on the industrial photovoltaics page. De Castelli, at Crocetta del Montello, has 10 Kita Air Cold units of 40 kW, 400 kW in all, integrated with the company&#8217;s new photovoltaic system: the air-to-air units heat and cool the building with the roof&#8217;s electricity. How many kW an industrial building needs is in the <a href=\"https:\/\/templari.com\/en\/news\/how-many-kw-to-heat-an-industrial-building\/\" rel=\"noreferrer\">tip on industrial buildings<\/a>.<\/p>\n<p>A study by RSE (Ricerca sul Sistema Energetico, Italy) on 78 Italian building types confirms it: a heat pump and photovoltaics together can save more than 70% of non-renewable primary energy.<\/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\/capannone-fotovoltaico-pompe-di-calore-kita-air-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-fotovoltaico-pompe-di-calore-kita-air.jpg\" class=\"lazyload\" alt=\"Photovoltaics on the roofs of an industrial building and Kita Air outdoor units along the wall: the electricity produced by day is used by the climate control\" width=\"1600\" height=\"900\" loading=\"lazy\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-fotovoltaico-pompe-di-calore-kita-air.jpg\" alt=\"Photovoltaics on the roofs of an industrial building and Kita Air outdoor units along the wall: the electricity produced by day is used by the climate control\" width=\"1600\" height=\"900\" loading=\"lazy\"><\/noscript><\/picture><figcaption>Photovoltaics on the roofs of an industrial building and Kita Air outdoor units along the wall: the electricity produced by day is used by the climate control.<\/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 whoever proposes it<\/h2>\n<\/div>\n<div class=\"testo\">\n<ul>\n<li>Whether the controller can shift the heat pump&#8217;s work into the sunny hours, or only follows the thermostat.<\/li>\n<li>Whether it uses the walls as storage: without a battery it is the only free way to use midday electricity in the evening.<\/li>\n<li>Whether the machine counts the kWh produced and used on the display: ours do, and it is the only way to see how much of the roof really ends up in the heating.<\/li>\n<li>To size the two things together, on real consumption and not on square metres of roof.<\/li>\n<li>Which incentives apply: national incentives for replacing a boiler with a heat pump, and the current deductions for photovoltaics.<\/li>\n<\/ul>\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>How many kW of photovoltaics does a heat pump need?<\/summary>\n<p>For a detached house usually 6 kWp: in Padua they produce 8,000 kWh a year against 4,500-5,300 of total consumption, house plus heat pump. More is not needed: in winter you do not cover everything anyway, and in summer you would give electricity away to the grid.<\/p>\n<\/details>\n<details>\n<summary>Does a heat pump with photovoltaics work in winter and at night too?<\/summary>\n<p>Yes, as always: at night and on overcast days it takes electricity from the grid. The roof covers part of the winter heating and almost all of the rest of the year.<\/p>\n<\/details>\n<details>\n<summary>Do I need a battery?<\/summary>\n<p>It is not compulsory. A battery costs ten to twenty thousand euros; the hot water cylinder and the energy optimiser shift part of the work into the sunny hours without buying one.<\/p>\n<\/details>\n<details>\n<summary>How much does a 6 kW system produce in December?<\/summary>\n<p>In Padua 391 kWh in the month, about 13 kWh a day, against 919 in July. In Rome 514 (PVGIS data).<\/p>\n<\/details>\n<details>\n<summary>How much do you save?<\/summary>\n<p>It depends on how much roof electricity the house really uses. The honest sum is made with the previous year&#8217;s consumption and the self-consumption share; the machine shows it on the display, kWh produced and used.<\/p>\n<\/details>\n<details>\n<summary>And in an industrial building?<\/summary>\n<p>There photovoltaics pay most: consumption is by day, when the roof produces, and the roof is large. You need 500-600 square metres of roof for every 100 kWp.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"fine chiara\">\n<div class=\"wrap\">\n<p class=\"tpl-vedi-anche\"><strong>See also:<\/strong> <a href=\"https:\/\/templari.com\/en\/news\/hybrid-boiler-hybrid-heat-pump\/\" rel=\"noreferrer\">Hybrid boiler and hybrid heat pump: what they really are, and why we do not make them<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/heat-pump-water-heater\/\" rel=\"noreferrer\">Heat pump water heater or the system heat pump: hot water with a heat pump<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-cooling\/\" rel=\"noreferrer\">Cooling with a heat pump: underfloor or fan coils, how efficient it is and what you need<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/news\/three-phase-or-single-phase-heat-pump\/\" rel=\"noreferrer\">Three phase or single phase heat pump: which to choose and what supply you need<\/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>. The next one in two weeks.<\/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\":\"How many kW of photovoltaics does a heat pump need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"For a detached house usually 6 kWp: in Padua they produce 8,000 kWh a year against 4,500-5,300 of total consumption, house plus heat pump. More is not needed: in winter you do not cover everything anyway, and in summer you would give electricity away to the grid.\"}},{\"@type\":\"Question\",\"name\":\"Does a heat pump with photovoltaics work in winter and at night too?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, as always: at night and on overcast days it takes electricity from the grid. The roof covers part of the winter heating and almost all of the rest of the year.\"}},{\"@type\":\"Question\",\"name\":\"Do I need a battery?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is not compulsory. A battery costs ten to twenty thousand euros; the hot water cylinder and the energy optimiser shift part of the work into the sunny hours without buying one.\"}},{\"@type\":\"Question\",\"name\":\"How much does a 6 kW system produce in December?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In Padua 391 kWh in the month, about 13 kWh a day, against 919 in July. In Rome 514 (PVGIS data).\"}},{\"@type\":\"Question\",\"name\":\"How much do you save?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It depends on how much roof electricity the house really uses. The honest sum is made with the previous year's consumption and the self-consumption share; the machine shows it on the display, kWh produced and used.\"}},{\"@type\":\"Question\",\"name\":\"And in an industrial building?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"There photovoltaics pay most: consumption is by day, when the roof produces, and the roof is large. You need 500-600 square metres of roof for every 100 kWp.\"}}]}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Technical tips Heat pump and solar panels: how much the roof really covers, month by month, and how to make them work together A heat pump and photovoltaics go together&#8230;<\/p>\n","protected":false},"author":3,"featured_media":14393,"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-13890","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>Heat pump and solar panels: what the roof covers | Templari<\/title>\n<meta name=\"description\" content=\"Heat pump and solar panels: a 6 kWp roof in Padua makes 8,000 kWh a year but 391 in December. 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