{"id":4104,"date":"2026-03-17T00:54:52","date_gmt":"2026-03-16T23:54:52","guid":{"rendered":"https:\/\/calores.pl\/calores-systems-for-multi-family-construction\/"},"modified":"2026-03-17T00:54:52","modified_gmt":"2026-03-16T23:54:52","slug":"calores-systems-for-multi-family-construction","status":"publish","type":"post","link":"https:\/\/calores.pl\/en\/calores-systems-for-multi-family-construction\/","title":{"rendered":"Calores Systems for Multi-Family Construction"},"content":{"rendered":"

How does two-stage heating work?<\/h2><\/div>

PVT modules preheat the medium, and the main heat source raises the temperature to the required working value.<\/p>\n<\/div>

PVT modules preheat the medium, and the main heat source raises the temperature to the required working value.<\/p>\n<\/div>

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Higher COP pump<\/h2><\/div>
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PVT preheats the medium, thanks to which the heat pump operates in more favorable conditions. This improves seasonal efficiency and reduces electricity consumption. <\/p>\n<\/div><\/div><\/div>

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Lower gas consumption<\/h2><\/div>
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In the gas system, the boiler heats up the already raised temperature of the medium. The burner works less and less frequently, which reduces fuel consumption and operating costs <\/p>\n<\/div><\/div><\/div>

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Stable operation of the system<\/h2><\/div>
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Two-stage heating reduces load spikes and stabilizes the operation of the entire installation. The system maintains parameters more smoothly even with variable consumption <\/p>\n<\/div><\/div><\/div>

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Less energy loss<\/h2><\/div>
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With high demand for CWU, the installation responds faster to changes and works more effectively. This translates into less energy loss during peak hours. <\/p>\n<\/div><\/div><\/div>

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Configuration no 1<\/b><\/h3><\/div>

PVT+ gas boiler<\/h1><\/div>

This is the basic variant of the system for buildings with a gas boiler room.<\/p>\n<\/div><\/div><\/div>

Description of operation:<\/h4><\/div>
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PVT: preheating<\/h2><\/div>
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PVT modules produce electricity and preheat the medium, offloading the main heat source.<\/p>\n<\/div><\/div><\/div>

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Heat pump: main source<\/h2><\/div>
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The system achieves better annual efficiency thanks to a lower heat pump load.<\/p>\n<\/div><\/div><\/div>

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Boiler: the peak role<\/h2><\/div>
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The gas boiler acts as a peak or emergency source, stabilizing the system at demanding moments.<\/p>\n<\/div><\/div><\/div>

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Due to preheating of water by PVT:<\/h3><\/div><\/div><\/div>
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PVT: preheating<\/h2><\/div>
<\/div>
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PVT modules produce electricity and preheat the medium, offloading the main heat source.<\/p>\n<\/div><\/div><\/div>

<\/i><\/div>

Heat pump: main source<\/h2><\/div>
<\/div>
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The system achieves better annual efficiency thanks to a lower heat pump load.<\/p>\n<\/div><\/div><\/div>

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Boiler: the peak role<\/h2><\/div>
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The gas boiler acts as a peak or emergency source, stabilizing the system at demanding moments.<\/p>\n<\/div><\/div><\/div>

<\/div><\/div><\/div><\/div>

Thanks to the preheating of water by PVT<\/h3><\/div>
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The boiler consumes less fuel<\/h2><\/div><\/div><\/div>
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The working time of the burner is reduced<\/h2><\/div><\/div><\/div>
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decreases the load on the installation during peak periods<\/h2><\/div><\/div><\/div>
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Nature of the solution<\/h2><\/div>
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modernization of existing infrastructure<\/h2><\/div><\/div><\/div>
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low degree of interference in the installation<\/h2><\/div><\/div><\/div>
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reduction of gas consumption without changing the main heat source<\/h2><\/div><\/div><\/div>
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transitional solution in the energy transition process<\/h2><\/div><\/div><\/div>
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Configuration no 2<\/b><\/h3><\/div>

PVT + gas boiler + heat pump<\/h1><\/div>

In this variant, the system is expanded with a heat pump, which takes over the role of the main heat source in typical operating conditions.<\/p>\n<\/div><\/div><\/div>

Description of operation:<\/h4><\/div>
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Preheating by PVT<\/h2><\/div>
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PVT modules produce electricity and at the same time preheat the medium, relieving the main heat source.<\/p>\n<\/div><\/div><\/div>

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Heat pump as a primary source<\/h2><\/div>
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The heat pump (air or ground) takes over the role of the primary heat source for CWU and\/or CO.<\/p>\n<\/div><\/div><\/div>

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Gas boiler as a security<\/h2><\/div>
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The gas boiler acts as a peak or backup source, supporting the system during high demand or in exceptional situations.<\/p>\n<\/div><\/div><\/div>

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Two-stage heating in this configuration increases the efficiency of the heat pump because:<\/h3><\/div><\/div><\/div>
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Better compressor operating conditions<\/h2><\/div>
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Thanks to the preheating of the medium by PVT, the compressor operates at a higher inlet temperature, which improves the stability of the system.<\/p>\n<\/div><\/div><\/div>

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Higher seasonal COP<\/h2><\/div>
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Two-stage heating increases the efficiency of the heat pump over the entire season, improving system performance in daily operation.<\/p>\n<\/div><\/div><\/div>

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Lower electricity consumption<\/h2><\/div>
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The heat pump requires less energy to achieve operating parameters, which translates into lower costs and better installation economics.<\/p>\n<\/div><\/div><\/div>

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Nature of the solution<\/h2><\/div>
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significant reduction of operating costs<\/h2><\/div><\/div><\/div>
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operational flexibility<\/h2><\/div><\/div><\/div>
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peak power security through gas<\/h2><\/div><\/div><\/div>
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the possibility of gradually reducing the share of fossil fuels<\/h2><\/div><\/div><\/div>
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Configuration 3<\/b><\/h3><\/div>

PVT + heat pump (without gas)<\/h1><\/div>

A variant intended for investments focused on maximising the share of renewable energy.<\/p>\n<\/div><\/div><\/div>

Description of operation:<\/h4><\/div>
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Energy from PVT modules<\/h2><\/div>
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PVT modules simultaneously generate electricity and thermal energy, providing real support for the operation of the entire heating system.<\/p>\n<\/div><\/div><\/div>

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Heat pump as the core<\/h2><\/div>
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The heat pump, also in a high-temperature version according to our design, serves as the only main heat source.<\/p>\n<\/div><\/div><\/div>

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Stability through buffers<\/h2><\/div>
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Enlarged domestic hot water tanks and a central heating buffer stabilise the operation of the installation and maintain parameters even under variable sunlight conditions.<\/p>\n<\/div><\/div><\/div>

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Intelligent system automation<\/h2><\/div>
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The control automation optimises energy flows between PVT, the heat pump, and heat storage, increasing the efficiency of the system.<\/p>\n<\/div><\/div><\/div>

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In this configuration, energy is obtained from:<\/h3><\/div><\/div><\/div>
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solar radiation (PVT)<\/h2><\/div>
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outdoor air (heat pump)<\/h2><\/div>
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Nature of the solution<\/h2><\/div>
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no gas infrastructure<\/h2><\/div><\/div><\/div>
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high annual energy efficiency<\/h2><\/div><\/div><\/div>
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reduction of CO\u2082 emissions<\/h2><\/div><\/div><\/div>
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preparation of the building for low- and zero-emission standards.<\/h2><\/div><\/div><\/div>
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<\/span><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"

In our offer, the flagship systems for multi-family buildings are solutions based on photovoltaic-thermal (PVT) modules, cooperating with various peak heat sources.
These systems use a two-stage heating mechanism, which increases the efficiency of the entire installation and reduces energy consumption. <\/p>\n","protected":false},"author":1,"featured_media":3983,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97,96],"tags":[100,99],"class_list":["post-4104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hvac","category-systems","tag-hvac","tag-systemy"],"_links":{"self":[{"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/posts\/4104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/comments?post=4104"}],"version-history":[{"count":0,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/posts\/4104\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/media\/3983"}],"wp:attachment":[{"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/media?parent=4104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/categories?post=4104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/calores.pl\/en\/wp-json\/wp\/v2\/tags?post=4104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}