{"id":34421,"date":"2025-03-01T09:32:00","date_gmt":"2025-03-01T07:32:00","guid":{"rendered":"https:\/\/pleion.it\/?p=34421"},"modified":"2026-10-27T17:00:34","modified_gmt":"2026-10-27T15:00:34","slug":"natural-or-forced-circulation-solar-thermal-which-to-choose","status":"publish","type":"post","link":"https:\/\/pleion.it\/en\/natural-or-forced-circulation-solar-thermal-which-to-choose\/","title":{"rendered":"Natural or forced circulation solar thermal systems: which should you choose?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"34421\" class=\"elementor elementor-34421 elementor-25014\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7f681ce elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"7f681ce\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e42a681 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"e42a681\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div data-dce-text-color=\"#000000\" class=\"elementor-element elementor-element-8347ffb sc_fly_static elementor-widget elementor-widget-text-editor\" data-id=\"8347ffb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Solar thermal systems fall into two types: depending on whether a pump is used to circulate the water, they operate with natural circulation or forced circulation. Let\u2019s look at the differences and characteristics of each system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5ef9649 elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"5ef9649\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-60c8856 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"60c8856\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2ab7e6a sc_fly_static elementor-widget elementor-widget-spacer\" data-id=\"2ab7e6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4fd95f2 elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"4fd95f2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-749cb3a sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"749cb3a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c115480 sc_fly_static elementor-widget elementor-widget-text-editor\" data-id=\"c115480\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>If you are reading this article, you probably already know what a solar thermal system is. It is one of the most beneficial technologies available to Italian households today for reducing their dependence on fossil fuels, making substantial savings on energy bills and lowering CO2 emissions.<\/p>\n<p>This article takes a closer look at the characteristics of natural-circulation and forced-circulation systems. The two systems differ considerably: each has its own advantages and performs best in different applications.<\/p>\n<p>Topics covered in this article:<\/p>\n<ul class=\"pleion-article-toc\"><li><a href=\"#come-funziona-un-impianto-solare-termico\">How does a solar thermal system work?<\/a><\/li><li><a href=\"#che-differenza-c-e-tra-impianti-a-circolazione-naturale-e-impianti-a-circolazione-forzata\">What is the difference between natural-circulation and forced-circulation systems?<\/a><\/li><li><a href=\"#come-funziona-un-impianto-solare-a-circolazione-naturale\">How does a natural-circulation solar system work?<\/a><\/li><li><a href=\"#come-funziona-un-impianto-solare-a-circolazione-forzata\">How does a forced-circulation solar system work?<\/a><\/li><li><a href=\"#quale-sistema-scegliere\">Which system should you choose?<\/a><\/li><li><a href=\"#vantaggi-del-sistema-a-circolazione-naturale\">Advantages of natural circulation<\/a><\/li><li><a href=\"#vantaggi-del-sistema-a-circolazione-forzata\">Advantages of forced circulation<\/a><\/li><li><a href=\"#a-ciascuno-la-sua-tecnologia-con-pleion\">The right technology for everyone, with Pleion<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b3d8ded elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"b3d8ded\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f0165b8 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"f0165b8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-75dc036 sc_fly_static elementor-widget elementor-widget-spacer\" data-id=\"75dc036\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a87c43e elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"a87c43e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-70537a3 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"70537a3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-42dda42 sc_fly_static elementor-widget elementor-widget-text-editor\" data-id=\"42dda42\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 id=\"come-funziona-un-impianto-solare-termico\" class=\"SFCompactDisplayMedium text-red my-3\">How does a solar thermal system work?<\/h2>\n<p>A solar thermal system combines several components to capture thermal energy from solar radiation and transfer it to domestic hot water or to the water used for space heating. This allows it to produce hot water using free solar energy, improving the home\u2019s efficiency and reducing dependence on fossil fuels.<br><br>Hot water is produced using one or more solar panels, also called collectors, which convert the sun\u2019s energy into heat, together with a storage tank that holds the hot water for later use.<br><br>Depending on whether a water circulation pump is used, there are two types: natural-circulation and forced-circulation solar thermal systems. Let\u2019s examine their differences and characteristics.<\/p>\n<h3 id=\"che-differenza-c-e-tra-impianti-a-circolazione-naturale-e-impianti-a-circolazione-forzata\" class=\"SFCompactDisplayMedium text-red my-3\">What is the difference between natural-circulation and forced-circulation systems?<\/h3>\n<p>The main difference concerns how the heated fluid circulates through the system. In the first type, circulation occurs naturally through basic physical principles. In the second, an additional electrically powered device is used: the circulation pump.<\/p>\n<ul>\n<li>In a natural-circulation system, the fluid moves because hot and cold fluids have different densities. As it heats up, the fluid expands, becomes less dense and rises towards the top of the collector, where the tank is located, or towards the water outlet in systems with integrated storage. There are also systems such as the innovative all-in-one EGO, in which domestic water flows through the panel simply under mains water pressure.<\/li>\n<li>In a forced-circulation system, water movement is provided by a circulation pump that starts when the collector reaches the temperature set for the tank. These systems also have a controller whose main task is to manage the circulation pump.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6391fd6 elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"6391fd6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a261c2c sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"a261c2c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3d00f8a dce_masking-none sc_fly_static elementor-widget elementor-widget-image\" data-id=\"3d00f8a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"257\" height=\"300\" src=\"https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-257x300.webp\" class=\"attachment-medium size-medium wp-image-34430\" alt=\"Natural-circulation solar thermal system\" srcset=\"https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-257x300.webp 257w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-877x1024.webp 877w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-128x150.webp 128w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-768x897.webp 768w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-370x432.webp 370w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-840x981.webp 840w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-410x479.webp 410w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale-600x701.webp 600w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneNaturale.webp 1096w\" sizes=\"(max-width: 257px) 100vw, 257px\" title=\"Natural-circulation solar thermal system - Pleion\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-61d6b1e elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"61d6b1e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0d2b818 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"0d2b818\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5101aad sc_fly_static elementor-widget elementor-widget-spacer\" data-id=\"5101aad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e94057d elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"e94057d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ae7447b sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"ae7447b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-da8be6d sc_fly_static elementor-widget elementor-widget-text-editor\" data-id=\"da8be6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 id=\"come-funziona-un-impianto-solare-a-circolazione-naturale\" class=\"SFCompactDisplayMedium text-red my-3\">How does a natural-circulation solar system work?<\/h3>\n<p>Circulation is described as \u201cnatural\u201d because no circulation pump is required. These systems operate through gravity, with the heated fluid rising to the top of the collector, or, as in the EGO solar thermal system, simply through mains water pressure.<\/p>\n<p>Pleion\u2019s natural-circulation range includes high-performance all-in-one systems intended exclusively for domestic hot water, with capacities limited to 300 litres. These systems do not use a separate heat-transfer fluid: the water is heated directly inside the collector.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ff2c794 elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"ff2c794\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7f87667 sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"7f87667\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-424650f dce_masking-none sc_fly_static elementor-widget elementor-widget-image\" data-id=\"424650f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"257\" height=\"300\" src=\"https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-257x300.webp\" class=\"attachment-medium size-medium wp-image-34431\" alt=\"Forced-circulation solar thermal system\" srcset=\"https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-257x300.webp 257w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-877x1024.webp 877w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-128x150.webp 128w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-768x897.webp 768w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-370x432.webp 370w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-840x981.webp 840w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-410x479.webp 410w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata-600x701.webp 600w, https:\/\/pleion.it\/wp-content\/uploads\/2025\/03\/iconSistemiSolariTermiciCircolazioneForzata.webp 1096w\" sizes=\"(max-width: 257px) 100vw, 257px\" title=\"Forced-circulation solar thermal system - Pleion\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-97796ed elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"97796ed\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ba1fd5e sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"ba1fd5e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5d1d8d3 sc_fly_static elementor-widget elementor-widget-spacer\" data-id=\"5d1d8d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-396cd2c elementor-section-boxed elementor-section-height-default elementor-section-height-default sc_fly_static\" data-id=\"396cd2c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-extended\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a881e7f sc_content_align_inherit sc_layouts_column_icons_position_left sc_fly_static\" data-id=\"a881e7f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-89de125 sc_fly_static elementor-widget elementor-widget-text-editor\" data-id=\"89de125\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 id=\"come-funziona-un-impianto-solare-a-circolazione-forzata\" class=\"SFCompactDisplayMedium text-red my-3\">How does a forced-circulation solar system work?<\/h3>\n<p>While a natural-circulation system may consist of a single all-in-one unit serving as both collector and tank, a forced-circulation collector forms part of a solar system with a separate storage tank and a circulation pump.<\/p>\n<p>The flat-plate or evacuated-tube collector is connected to a primary circuit containing a heat-transfer fluid with antifreeze properties, usually a mixture of water and glycol. Once heated, this fluid carries the collected heat to the cylinder, where domestic hot water is stored.<\/p>\n<p>The system also includes a controller that starts the circulation pump when the fluid in the collector is hotter than the water in the tank.<\/p>\n<h3 id=\"quale-sistema-scegliere\" class=\"SFCompactDisplayMedium text-red my-3\">Which system should you choose?<\/h3>\n<p>Now that we have looked at how the two systems work, let\u2019s examine the advantages of natural circulation and forced circulation.<\/p>\n<h3 id=\"vantaggi-del-sistema-a-circolazione-naturale\" class=\"SFCompactDisplayMedium text-red my-3\">Advantages of natural circulation<\/h3>\n<p>Natural-circulation systems are particularly advantageous in summer and in areas with high solar irradiation. Because they do not have a tank inside the home, sheltered from bad weather and falling night-time temperatures, they are not suitable for cold climates, for supporting space heating or for high domestic hot water demand.<\/p>\n<p>Compared with other systems, natural-circulation systems are less expensive, more compact and offer good performance, especially in mild climates. Their main advantages are:<\/p>\n<ul>\n<li>Low maintenance;<\/li>\n<li>Low installation and maintenance costs;<\/li>\n<li>Little space required: the entire solar system is on the roof, with no indoor technical room needed for a cylinder;<\/li>\n<li>No energy consumption, unless local conditions require an electric frost-protection heater.<\/li>\n<\/ul>\n<p>Pleion\u2019s natural-circulation range also includes FreeGO, a portable all-in-one system that connects to a normal tap to provide hot water wherever it is needed, whether travelling or in your garden.<\/p>\n<h3 id=\"vantaggi-del-sistema-a-circolazione-forzata\" class=\"SFCompactDisplayMedium text-red my-3\">Advantages of forced circulation<\/h3>\n<p>Of the two types, forced circulation is the more versatile. One or more flat-plate or evacuated-tube collectors carrying a frost-protecting water\/glycol mixture, together with the option of storing water in a solar cylinder in a sheltered location, provide good performance in all climatic conditions and allow the system to support space heating.<\/p>\n<p>Although these systems are more complex and cost more, their advantages are clear:<\/p>\n<ul>\n<li>Greater thermal efficiency;<\/li>\n<li>Greater versatility;<\/li>\n<li>The ability to support space heating or heat a swimming pool.<\/li>\n<\/ul>\n<p>Disadvantages include the need for an indoor technical room to house the cylinder\/storage tank, circulation pump and other components, such as the solar expansion vessel, and an electricity supply for the pump and controller. However, the electricity consumed is very small compared with the renewable energy obtained from the sun.<\/p>\n<h3 id=\"a-ciascuno-la-sua-tecnologia-con-pleion\" class=\"SFCompactDisplayMedium text-red my-3\">The right technology for everyone, with Pleion<\/h3>\n<p>As this article shows, neither system is universally better than the other. Each delivers different performance and is better suited to particular applications.<\/p>\n<p>To identify the best system for you, consider costs, demand and intended uses: domestic hot water only, or space heating as well. The building\u2019s structural characteristics and the local climate also need to be taken into account.<\/p>\n<p>For a more detailed assessment, contact one of our retailers or authorised service centres. An expert will help you choose the most suitable solar thermal system. Rely on the experience, expertise and manufacturing capabilities of a company that has reinvented solar thermal technology in Italy.<\/p>\n<p><a href=\"https:\/\/pleion.it\/en\/find-pleion\/\">Find a retailer or authorised service centre<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Solar thermal systems fall into two types: depending on whether a pump is used to circulate the water, they operate with natural circulation or forced circulation. Let\u2019s look at the&hellip;<\/p>\n","protected":false},"author":2,"featured_media":34429,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[835],"tags":[],"class_list":["post-34421","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Compare natural-circulation and forced-circulation solar thermal systems: how they work, their benefits and the factors to consider when choosing.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"C4RL0V1NC0\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/pleion.it\/en\/natural-or-forced-circulation-solar-thermal-which-to-choose\/\" \/>\n\t\t<meta 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15:11:50","created":"2026-10-27 14:59:11","updated":"2026-10-27 15:20:03","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/pleion.it\/en\/\" title=\"Home\">Home<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\t<a href=\"https:\/\/pleion.it\/en\/categoria-articolo\/blog\/\" title=\"Blog\">Blog<\/a>\n<\/span><span class=\"aioseo-breadcrumb-separator\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\tNatural or forced circulation solar thermal systems: which should you choose?\n<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/pleion.it\/en\/"},{"label":"Blog","link":"https:\/\/pleion.it\/en\/categoria-articolo\/blog\/"},{"label":"Natural or forced circulation solar thermal systems: which should you choose?","link":"https:\/\/pleion.it\/en\/natural-or-forced-circulation-solar-thermal-which-to-choose\/"}],"_links":{"self":[{"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/posts\/34421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/comments?post=34421"}],"version-history":[{"count":1,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/posts\/34421\/revisions"}],"predecessor-version":[{"id":34477,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/posts\/34421\/revisions\/34477"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/media\/34429"}],"wp:attachment":[{"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/media?parent=34421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/categories?post=34421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pleion.it\/en\/wp-json\/wp\/v2\/tags?post=34421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}