{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:29:26Z","timestamp":1760059766421,"version":"build-2065373602"},"reference-count":48,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2025,7,6]],"date-time":"2025-07-06T00:00:00Z","timestamp":1751760000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science, Technological Development and Innovation of the Republic of Serbia","award":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"],"award-info":[{"award-number":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"]}]},{"DOI":"10.13039\/501100000780","name":"EU funds","doi-asserted-by":"publisher","award":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"],"award-info":[{"award-number":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"]}],"id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Operational Programme Johannes Amos Comenius and the Ministry of Education, Youth, and Sports of the Czech Republic through the e-INFRA CZ","award":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"],"award-info":[{"award-number":["451-03-136\/2025-03\/200102","CZ.02.01.01\/00\/23_021\/0008759","90254"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Algorithms"],"abstract":"<jats:p>This article aims to evaluate the seasonal efficiency of natural gas boilers used in European households, highlighting the cost effectiveness, environmental benefits, and user comfort associated with higher-efficiency models, particularly those based on condensing technology. The study applies a standardized algorithm used in European energy labeling schemes to calculate the seasonal efficiency of household gas boilers. It further includes a comparative analysis of selected boiler models available on the Serbian market and outlines a step-by-step method for estimating gas savings when replacing older, less efficient boilers with modern units. Condensing boilers demonstrate significantly higher seasonal efficiency than standard models by recovering additional heat from exhaust gases. These improved boilers produce lower greenhouse gas emissions and offer annual fuel savings of approximately 10% to 30%, depending on the boiler\u2019s age, system design, and usage patterns. The results also confirm the direct correlation between seasonal efficiency and annual fuel consumption, validating the use of efficiency-based cost comparisons. The analysis focuses on residential gas boilers available in the Serbian market, although the models examined are commonly distributed across Europe. The findings highlight the important role of energy efficiency labels\u2014based on a standardized algorithm\u2014in guiding boiler selection, helping consumers and policymakers make informed decisions that promote energy savings and reduce environmental impact. This article contributes to the theoretical and practical understanding of gas boiler efficiency by integrating algorithm-based evaluation with market data and user-centered considerations. It offers actionable insights for consumers, energy advisors, and policymakers in the context of Europe\u2019s energy transition. Verifying the efficiency calculations of gas boilers requires a careful combination of theoretical methods, measured data, and adherence to standards.<\/jats:p>","DOI":"10.3390\/a18070416","type":"journal-article","created":{"date-parts":[[2025,7,7]],"date-time":"2025-07-07T04:43:37Z","timestamp":1751863417000},"page":"416","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["European Efficiency Schemes for Domestic Gas Boilers: Estimation of Savings in Heating of Settlements"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2502-0601","authenticated-orcid":false,"given":"Dejan","family":"Brki\u0107","sequence":"first","affiliation":[{"name":"Faculty of Electronic Engineering, University of Ni\u0161, 18000 Ni\u0161, Serbia"},{"name":"IT4Innovations, VSB, Technical University of Ostrava, 708 00 Ostrava, Czech Republic"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Tsoumalis, G.I., Bampos, Z.N., Chatzis, G.V., and Biskas, P.N. (2022). Overview of Natural Gas Boiler Optimization Technologies and Potential Applications on Gas Load Balancing Services. Energies, 15.","DOI":"10.3390\/en15228461"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1738","DOI":"10.1016\/j.energy.2008.08.009","article-title":"Systematic Approach to Natural Gas Usage for Domestic Heating in Urban Areas","volume":"33","year":"2008","journal-title":"Energy"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Roca Reina, J.C., Carlsson, J., Volt, J., and Toleikyte, A. (2025). Alternatives for Decarbonising High-Temperature Heating Facilities in Residential Buildings. Energies, 18.","DOI":"10.3390\/en18020235"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Hor\u00e1k, J., Kubo\u0148ov\u00e1, L., Dej, M., Ry\u0161av\u00fd, J., Bajer, S., Kysu\u010dan, Z., Ulrich, P., Mare\u010dek, P., Tesa\u0159, F., and Garba, M. (2022). Long-Term Neutralization of Acidic Condensate from Gas Condensing Boilers. Sustainability, 14.","DOI":"10.3390\/su142215015"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Fern\u00e1ndez-Cheliz, D., Velasco-G\u00f3mez, E., Peral-Andr\u00e9s, J., and Tejero-Gonz\u00e1lez, A. (2021). Energy Performance Optimization in a Condensing Boiler. Environ. Sci. Proc., 9.","DOI":"10.3390\/environsciproc2021009006"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Spiridon, \u015e.I., Monea, B.F., and Ionete, E.I. (2025). Optimizing a Hydrogen and Methane Blending System Through Design and Simulation. Fuels, 6.","DOI":"10.3390\/fuels6020028"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Siksnelyte-Butkiene, I., Karpavicius, T., Streimikiene, D., and Balezentis, T. (2022). The achievements of climate change and energy policy in the European Union. Energies, 15.","DOI":"10.3390\/en15145128"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1333","DOI":"10.1007\/s11869-022-01156-5","article-title":"European Union policies and their role in combating climate change over the years","volume":"15","year":"2022","journal-title":"Air Qual. Atmos. Health"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"111162","DOI":"10.1016\/j.enbuild.2021.111162","article-title":"Reducing household greenhouse gas emissions from space and water heating through low-carbon technology: Identifying cost-effective approaches","volume":"248","author":"Rafique","year":"2021","journal-title":"Energy Build."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.erss.2016.10.011","article-title":"Homes as machines: Exploring expert and public imaginaries of low carbon housing futures in the United Kingdom","volume":"23","author":"Cherry","year":"2017","journal-title":"Energy Res. Soc. Sci."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1007\/s43937-024-00056-2","article-title":"Serbian energy sector in the global political landscape amid the Russia-Ukraine war: A focus on perspectives of integration into the European Union","volume":"4","year":"2024","journal-title":"Discov. Energy"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"330","DOI":"10.1177\/01445987231215445","article-title":"Serbian energy sector in a gap between east and west","volume":"42","year":"2024","journal-title":"Energy Explor. Exploit."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Brki\u0107, D., and Praks, P. (2020). Proper Use of Technical Standards in Offshore Petroleum Industry. J. Mar. Sci. Eng., 8.","DOI":"10.3390\/jmse8080555"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1016\/j.jclepro.2013.12.059","article-title":"Energy and environmental impacts of energy related products (ErP): A case study of biomass-fueled systems","volume":"85","author":"Cellura","year":"2014","journal-title":"J. Clean. Prod."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1179\/174602207X241923","article-title":"Modelling the Performance of Condensing Boilers","volume":"80","author":"Hanby","year":"2007","journal-title":"J. Energy Inst."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Brki\u0107, D. (2025). Fire Hazards Caused by Equipment Used in Offshore Oil and Gas Operations: Prescriptive vs. Goal-Oriented Legislation. Fire, 8.","DOI":"10.3390\/fire8010029"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Zangheri, P., Economidou, M., and Labanca, N. (2019). Progress in the Implementation of the EU Energy Efficiency Directive through the Lens of the National Annual Reports. Energies, 12.","DOI":"10.3390\/en12061107"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Zangheri, P., D\u2019Agostino, D., Armani, R., and Bertoldi, P. (2022). Review of the Cost-Optimal Methodology Implementation in Member States in Compliance with the Energy Performance of Buildings Directive. Buildings, 12.","DOI":"10.3390\/buildings12091482"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Ba\u010dovsk\u00fd, M., Kar\u00e1sek, J., and Kalo\u010dai, L. (2024). Development of Municipal Energy Management as Trigger of Future Energy Savings. Buildings, 14.","DOI":"10.20944\/preprints202402.1254.v1"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"113716","DOI":"10.1016\/j.enbuild.2023.113716","article-title":"Towards Climate Neutrality within the European Union: Assessment of the Energy Performance of Buildings Directive Implementation in Member States","volume":"301","author":"Maduta","year":"2023","journal-title":"Energy Build."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Dill, A., Brown, T.R., Malmsheimer, R.W., Ha, H., Frank, J., Kileti, P., and Barkwill, B. (2024). Quantifying the Financial and Climate Impacts of Greenhouse Gas Abatement Pathways in Residential Space Heating. Sustainability, 16.","DOI":"10.3390\/su16052135"},{"key":"ref_22","unstructured":"(2025, April 27). Building Energy Performance Assessment. Available online: https:\/\/www.ncm-pcdb.org.uk\/sap\/."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Seraj, H., Bahadori-Jahromi, A., and Amirkhani, S. (2024). Developing a Data-Driven AI Model to Enhance Energy Efficiency in UK Residential Buildings. Sustainability, 16.","DOI":"10.3390\/su16083151"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1177\/0143624416675391","article-title":"Quantifying the performance of a passive deaerator in a gas-fired closed loop domestic wet central heating system","volume":"38","author":"Johnston","year":"2016","journal-title":"Build. Serv. Eng. Res. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Bennett, G., Elwell, C., Lowe, R., and Oreszczyn, T. (2016). The Importance of Heating System Transient Response in Domestic Energy Labelling. Buildings, 6.","DOI":"10.3390\/buildings6030029"},{"key":"ref_26","unstructured":"(2025, April 27). New EU Energy Labels Applicable from 1 March 2021. Available online: https:\/\/ec.europa.eu\/commission\/presscorner\/detail\/en\/ip_21_818."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Menegon, D., Lobosco, D., Mic\u00f2, L., and Fernandes, J. (2021). Labeling of Installed Heating Appliances in Residential Buildings: An Energy Labeling Methodology for Improving Consumers\u2019 Awareness. Energies, 14.","DOI":"10.3390\/en14217044"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"de Ayala, A., and Sol\u00e0, M.d.M. (2022). Assessing the EU Energy Efficiency Label for Appliances: Issues, Potential Improvements and Challenges. Energies, 15.","DOI":"10.3390\/en15124272"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Durmus Senyapar, H.N., Duzgun, B., and Boran, F.E. (2024). Energy Labels and Consumer Attitudes: A Study among University Staff. Sustainability, 16.","DOI":"10.3390\/su16051754"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Stasiuk, K., and Maison, D. (2022). The Influence of New and Old Energy Labels on Consumer Judgements and Decisions about Household Appliances. Energies, 15.","DOI":"10.3390\/en15041260"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"709","DOI":"10.1177\/0143624420927352","article-title":"Effect of boiler oversizing on efficiency: A dynamic simulation study","volume":"41","author":"Bennett","year":"2020","journal-title":"Build. Serv. Eng. Res. Technol."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"73","DOI":"10.5855\/ENERGY.2016.25.3.073","article-title":"A development of test method on the energy consumption efficiency of domestic gas boiler below 70 kW","volume":"25","author":"Park","year":"2016","journal-title":"J. Energy Eng."},{"key":"ref_33","unstructured":"(2025, April 27). Energy Saving Trust: How We Calculate Our Energy Saving Data. Available online: https:\/\/energysavingtrust.org.uk\/about-us\/our-data\/."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Mukisa, P.J., Ketuama, C.T., and Roub\u00edk, H. (2022). Biogas in Uganda and the Sustainable Development Goals: A Comparative Cross-Sectional Fuel Analysis of Biogas and Firewood. Agriculture, 12.","DOI":"10.3390\/agriculture12091482"},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Praks, P., Lampart, M., Praksov\u00e1, R., Brki\u0107, D., Kozubek, T., and Najser, J. (2022). Selection of Appropriate Symbolic Regression Models Using Statistical and Dynamic System Criteria: Example of Waste Gasification. Axioms, 11.","DOI":"10.3390\/axioms11090463"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Kociuba, D., and Janczak, M. (2024). Effects of the Disbursement of EU Cohesion Policy 2014\u20132020 Funds on Improving the Energy Efficiency of Buildings in Poland and Germany. Energies, 17.","DOI":"10.3390\/en17174417"},{"key":"ref_37","first-page":"11","article-title":"D\u00e9carbonation de la chaleur: Faire feu de tout bois","volume":"672","year":"2024","journal-title":"Rev. De L\u2019energie"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Tomo, A. (2020). \u201cEcobonus\u201d and \u201cecotax\u201d: Two recent Italian fiscal measures to promote the decarbonisation in the vehicles system. Economic Instruments for a Low-Carbon Future, Edward Elgar Publishing.","DOI":"10.4337\/9781839109911.00017"},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Hiris, D., Balan, M.C., and Bode, F.I. (2024). A Comprehensive Review on Enhancing Seasonal Energy Storage Systems through Energy Efficiency Perspectives. Processes, 12.","DOI":"10.3390\/pr12081623"},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Vespasiano, D., Sgaramella, A., Lo Basso, G., de Santoli, L., and Pastore, L.M. (2024). Hydrogen Blending in Natural Gas Grid: Energy, Environmental, and Economic Implications in the Residential Sector. Buildings, 14.","DOI":"10.3390\/buildings14082284"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"608","DOI":"10.1016\/j.jngse.2011.07.008","article-title":"The role of natural gas in smart grids","volume":"3","author":"Bliek","year":"2011","journal-title":"J. Nat. Gas Sci. Eng."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Vivanco-Mart\u00edn, B., and Iranzo, A. (2023). Analysis of the European Strategy for Hydrogen: A Comprehensive Review. Energies, 16.","DOI":"10.3390\/en16093866"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"822","DOI":"10.1016\/j.ijhydene.2024.08.277","article-title":"Green hydrogen landscape in North African countries: Strengths, challenges, and future prospects","volume":"84","author":"Bayssi","year":"2024","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"397","DOI":"10.1111\/reel.12575","article-title":"Navigating the hydrogen landscape: An analysis of hydrogen support mechanisms in the US and the EU","volume":"33","author":"Penttinen","year":"2024","journal-title":"Rev. Eur. Comp. Int. Environ. Law"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"2493","DOI":"10.1016\/j.jclepro.2016.11.025","article-title":"Environmental assessment of domestic boilers: A comparison of condensing and traditional technology using life cycle assessment methodology","volume":"142","author":"Vignali","year":"2017","journal-title":"J. Clean. Prod."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/j.enconman.2017.01.016","article-title":"Real-time monitoring energy efficiency and performance degradation of condensing boilers","volume":"136","author":"Baldi","year":"2017","journal-title":"Energy Convers. Manag."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Zhang, S., Shen, M., Kang, Y., and Tang, Z. (2025). The Design and Experimental Study of a Deep-Condensing Waste Heat Recovery System for Boiler Flue Gas Based on Baoneng Heating Plant. Processes, 13.","DOI":"10.3390\/pr13020306"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Song, M.J., Kim, W.C., and Lee, S.Y. (2025). The Corrosion Failure Mechanism of a Peak Load Boiler in a District Heating System. Appl. Sci., 15.","DOI":"10.3390\/app15084528"}],"container-title":["Algorithms"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1999-4893\/18\/7\/416\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:05:25Z","timestamp":1760033125000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1999-4893\/18\/7\/416"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,7,6]]},"references-count":48,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2025,7]]}},"alternative-id":["a18070416"],"URL":"https:\/\/doi.org\/10.3390\/a18070416","relation":{},"ISSN":["1999-4893"],"issn-type":[{"type":"electronic","value":"1999-4893"}],"subject":[],"published":{"date-parts":[[2025,7,6]]}}}