{"id":44886,"date":"2025-04-10T08:23:23","date_gmt":"2025-04-10T07:23:23","guid":{"rendered":"https:\/\/ecoforest.com\/news\/decarbonisation-of-a-social-housing-building-in-pasaia-water-to-water-heat-pumps-with-air-collection-in-a-dual-thermal-lift-system\/"},"modified":"2025-06-30T11:16:06","modified_gmt":"2025-06-30T10:16:06","slug":"decarbonisation-of-a-social-housing-building-in-pasaia-water-to-water-heat-pumps-with-air-collection-in-a-dual-thermal-lift-system","status":"publish","type":"post","link":"https:\/\/ecoforest.com\/en\/reference-installations\/decarbonisation-of-a-social-housing-building-in-pasaia-water-to-water-heat-pumps-with-air-collection-in-a-dual-thermal-lift-system\/","title":{"rendered":"Decarbonisation of a Social Housing Building in Pasaia \u2013 Water-to-water Heat Pumps with Air Collection in a Dual Thermal Lift System"},"content":{"rendered":"\n<div class=\"inherit-container-width wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group__inner-container\"><style>.wp-block-kadence-iconlist.kt-svg-icon-list-items_e91a48-36:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items_e91a48-36 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:10px;margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items_e91a48-36 ul.kt-svg-icon-list{grid-row-gap:5px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items_e91a48-36 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_e91a48-36 kt-svg-icon-list-columns-1 alignnone\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-_f0c2b0-68 .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_f0c2b0-68 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_f0c2b0-68 kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Location: Pasaia (Spain)<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-_ad93ea-fb .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_ad93ea-fb .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_ad93ea-fb kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Cathegory: cascade system with 2 central air- source heat pumps in combination with one water-to-water heat pump per household<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-_aa501b-f8 .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_aa501b-f8 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_aa501b-f8 kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Model: 2 <a href=\"https:\/\/ecoforest.com\/en\/products\/heat-pumps\/air-source-heat-pumps\/ecoair-3-18-pro\/\" target=\"_blank\" rel=\"noreferrer noopener\">ecoAIR<sup>+<\/sup> 3-18 PRO<\/a> and 8 <a href=\"https:\/\/ecoforest.com\/en\/products\/heat-pumps\/ground-source-heat-pumps\/bomba-de-calor-ecogeo-pro-1-6\/\" target=\"_blank\" rel=\"noreferrer noopener\">ecoGEO<sup>+<\/sup> 1-6 PRO<\/a><\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-_8ac437-61 .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_8ac437-61 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_8ac437-61 kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Power: 48 kW<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-_f363e2-72 .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_f363e2-72 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_f363e2-72 kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Services: Domestic hot water (DHM) and heating<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-_2a3de9-99 .kt-svg-icon-list-single{font-size:20px !important;color:#97bf0d !important;}.kt-svg-icon-list-item-_2a3de9-99 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-_2a3de9-99 kt-svg-icon-list-style-default\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_checkCircle kt-svg-icon-list-single\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"\/><polyline points=\"22 4 12 14.01 9 11.01\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Involved companies: <a href=\"https:\/\/www.tecnalia.com\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Tecnalia<\/a>, <a href=\"https:\/\/www.alokabide.euskadi.eus\/inicio\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Alokabide<\/a>, <a href=\"https:\/\/www.cartif.es\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">CARTIF<\/a><\/span><\/li>\n<\/ul><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/ecoforest.com\/en\/request-quote\/\">Look for an installer<\/a><\/div>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>A social housing building in the Basque Country has benefitted from all the advantages of renewable energy by replacing its individual natural gas boilers with a modern dual thermal lift installation using aerothermal and geothermal heat pumps from Ecoforest. This innovation was recognised with the 2024 DecarBuilding European Award for Decarbonised Installations, granted by the European Heat Pump Association (EHPA).<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading_e48e19-7f, .wp-block-kadence-advancedheading.kt-adv-heading_e48e19-7f[data-kb-block=\"kb-adv-heading_e48e19-7f\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_e48e19-7f mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_e48e19-7f[data-kb-block=\"kb-adv-heading_e48e19-7f\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<h2 class=\"kt-adv-heading_e48e19-7f wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_e48e19-7f\">H2020 HAPPENING Project<\/h2>\n\n\n\n<p>This installation was carried out as a case study for the H2020 HAPPENING project funded by the European Commission, which also includes two other demonstration sites in Austria and Italy. The system uses heat pumps as the main components to provide heating and domestic hot water (DHW), supported by photovoltaic panels and both thermal and electrical storage systems.<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading_66dab5-8d, .wp-block-kadence-advancedheading.kt-adv-heading_66dab5-8d[data-kb-block=\"kb-adv-heading_66dab5-8d\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_66dab5-8d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_66dab5-8d[data-kb-block=\"kb-adv-heading_66dab5-8d\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<h2 class=\"kt-adv-heading_66dab5-8d wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_66dab5-8d\">DHW and Heating Installation with Dual Thermal Lift<\/h2>\n\n\n\n<p>The Pasaia building, owned by the public social housing company Alokabide S.L., consists of 8 flats that previously had individual natural gas boilers. The new HAPPENING system centralises the production of warm water using two air-to-water heat pumps connected to a 2,000-litre tank. The first thermal lift occurs in this tank. From there, low-temperature water (20\u00b0C) is distributed to the individual dwellings, where a water-to-water heat pump carries out the second thermal lift to supply DHW and heating.<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading_55ef27-62, .wp-block-kadence-advancedheading.kt-adv-heading_55ef27-62[data-kb-block=\"kb-adv-heading_55ef27-62\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_55ef27-62 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_55ef27-62[data-kb-block=\"kb-adv-heading_55ef27-62\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<h2 class=\"kt-adv-heading_55ef27-62 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_55ef27-62\">Benefits<\/h2>\n\n\n\n<p>Decoupling energy production from demand improves the coefficient of performance (COP) of the central air-to-water heat pumps. Since COP varies with outdoor temperature, this system allows for the production of warm water during the warmest hours of the day\u2014when heat pump efficiency is highest. These hours also coincide with peak photovoltaic generation, maximising self-consumption. Additionally, distributing water at low temperatures significantly reduces thermal losses, which are a major issue in conventional central heating systems.<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading_f3250e-9a, .wp-block-kadence-advancedheading.kt-adv-heading_f3250e-9a[data-kb-block=\"kb-adv-heading_f3250e-9a\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_f3250e-9a mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_f3250e-9a[data-kb-block=\"kb-adv-heading_f3250e-9a\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<h2 class=\"kt-adv-heading_f3250e-9a wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_f3250e-9a\">Hybridisation with Photovoltaic Energy<\/h2>\n\n\n\n<p>The building is also equipped with a rooftop photovoltaic system and batteries to maximise the building\u2019s energy self-sufficiency, with a smart Energy Management System (EMS) managing any surplus energy. <strong>The Ecoforest heat pumps use this&nbsp; pv surplus<\/strong> by storing it as thermal energy in the warm water tank, reducing electricity consumption from the grid.<\/p>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading_27cd3e-31, .wp-block-kadence-advancedheading.kt-adv-heading_27cd3e-31[data-kb-block=\"kb-adv-heading_27cd3e-31\"]{font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_27cd3e-31 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_27cd3e-31[data-kb-block=\"kb-adv-heading_27cd3e-31\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<h2 class=\"kt-adv-heading_27cd3e-31 wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_27cd3e-31\">Natural Refrigerant R290<\/h2>\n\n\n\n<p>Thanks to the use of heat pumps with natural refrigerant R290, the energy retrofit preserved the existing radiators, as they are capable of operating at temperatures above 60\u00b0C. This resulted in considerable savings in both time and investment.<\/p>\n\n\n\n<p>The results confirm that this solution is an ideal alternative for the retrofit of multi-family residential buildings.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"405\" src=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_4.jpg\" alt=\"\" class=\"wp-image-44850\" title=\"\" srcset=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_4.jpg 768w, https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_4-300x158.jpg 300w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"405\" src=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_3.jpg\" alt=\"\" class=\"wp-image-44858\" title=\"\" srcset=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_3.jpg 768w, https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_3-300x158.jpg 300w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"405\" src=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_2.jpg\" alt=\"\" class=\"wp-image-44866\" title=\"\" srcset=\"https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_2.jpg 768w, https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_2-300x158.jpg 300w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A social housing building in the Basque Country has benefitted from all the advantages of renewable energy by replacing its individual natural gas boilers with a modern dual thermal lift installation using air-to-water and brine-to water heat pumps from Ecoforest. This innovation was recognised with the 2024 DecarBuilding European Award for Decarbonised Installations, granted by the European Heat Pump Association (EHPA).<\/p>\n","protected":false},"author":5,"featured_media":44876,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","site-sidebar-layout":"default","site-content-layout":"default","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":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[32],"tags":[417,359,379],"class_list":["post-44886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-reference-installations","tag-aerotermia-en","tag-bombas-de-calor-en","tag-instalacion-en"],"acf":[],"featured_image_src_large":["https:\/\/ecoforest.com\/wp-content\/uploads\/2025\/04\/pasaia_happening_tecnalia_ecoforest_1.jpg",768,405,false],"author_info":{"display_name":"Mercedes 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