{"id":6694,"date":"2026-05-10T15:51:50","date_gmt":"2026-05-10T07:51:50","guid":{"rendered":"https:\/\/www.china-heatpump.com\/?post_type=heatpump_faqs&#038;p=6694"},"modified":"2026-05-18T16:08:17","modified_gmt":"2026-05-18T08:08:17","slug":"%ef%bd%97hat-is-evi-heat-pump","status":"publish","type":"heatpump_faqs","link":"https:\/\/www.china-heatpump.com\/nl\/heatpump_faqs\/%ef%bd%97hat-is-evi-heat-pump\/","title":{"rendered":"\uff37hat is EVI Heat Pump?"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-6697 aligncenter\" src=\"https:\/\/www.china-heatpump.com\/wp-content\/uploads\/EVI-compressor-300x300.jpg\" alt=\"\" width=\"341\" height=\"341\" title=\"\" srcset=\"https:\/\/www.china-heatpump.com\/wp-content\/uploads\/EVI-compressor-300x300.jpg 300w, https:\/\/www.china-heatpump.com\/wp-content\/uploads\/EVI-compressor-12x12.jpg 12w, https:\/\/www.china-heatpump.com\/wp-content\/uploads\/EVI-compressor.jpg 600w\" sizes=\"(max-width: 341px) 100vw, 341px\" \/><\/p>\n<p>Most air source heat pumps work with very poor efficiency or even can not work when the environment temperature is lower than -10\u2103.<\/p>\n<p><strong>EVI<\/strong> stands for <strong>Enhanced Vapor Injection,<\/strong> an advanced heating technology is an innovation in the compressor and the refrigerant circulation.<\/p>\n<p>The heat pump uses a <strong>special EVI scroll compressor<\/strong> with a vapor injection port. <span style=\"font-size: 16px;\">An <\/span><strong style=\"font-size: 16px;\">economizer or flash tank<\/strong><span style=\"font-size: 16px;\"> splits the refrigerant into two streams:<\/span><\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Main flow: continues to the evaporator to absorb heat.<\/li>\n<li>Injection flow: enters the compressor\u2019s middle chamber to enhance compression.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>The injected vapor increases mass flow rate, reduces compressor discharge temperature, and improves heating output and efficiency.<\/p>\n<p>The EVI technology can get the following advantages:<\/p>\n<p>1 Reliable running under environment temperature -25\u2103<span style=\"color: #0000ff;\"> (Kolant&#8217;s EVI heat pump can work even at -35\u2103)<\/span><br \/>\n2 Getting much higher water temperature during low environment temperature Heating capacity up to 40% higher than normal heat pumps<br \/>\n3 COP 10%-20% higher during low environment temperature<\/p>\n<p><a href=\"https:\/\/www.china-heatpump.com\/nl\/kolant-evi-inverter-heat-pump-to-replace-boiler-working-at-35c\/\">Kolant can provide EVI heat pumps for different conditions<\/a><\/p>","protected":false},"featured_media":6697,"template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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