Residential space heating is one of the major contributors to greenhouse gas (GHG) emissions and hence a priority sector to decarbonise in the transition to Net Zero target by 2050 in the UK. To assess environmental impacts of a current heating system and potential alternatives in the UK, this study conducted a comparative LCA of a condensing gas boiler and a hybrid heating pump for a common type of UK’s existing houses (a semi-detached house). The functional unit of this study is defined as delivering space heating for the whole lifetime (20 years) of heating system. The results suggest that the hybrid heat pump potentially saves 30% of GHG emissions as compared to the condensing gas boiler in the core scenarios (4.5E + 04 kg CO2-eq/FU vs 6.4 E + 04 kg CO2-eq/FU respectively). The hybrid heat pump also shows 13% to 48% emission reduction as compared to the condensing gas boiler in terrestrial acidification, photochemical oxidant formation, particulate matter formation and fossil depletion. However, the hybrid heat pump emits 3 to 6 times more emissions in terms of human toxicity, water depletion and metal depletion than the condensing gas boiler. The production phase contributes around 50% of the impact for metal depletion and human toxicity in both core scenarios, while the use phase dominates in other selected impact categories. The combustion of natural gas and the electricity production are the major causes for the dominance of the use phase for all selected impact categories excepting metal depletion and human toxicity. The sensitivity scenarios support the robustness of the results. Further work is needed to understand the role hybrid heat pumps can play in the residential sector decarbonisation under different scenarios of residential uptake, household behaviour and wider UK energy system decarbonisation.

住宅空间供暖是造成温室气体（GHG）排放的主要因素之一，因此是英国在2050年实现向零净排放目标过渡过程中优先脱碳的部门。为了评估英国目前的供暖系统和潜在替代方案对环境的影响，本研究针对英国现有的普通房屋（半独立式房屋）对冷凝式燃气锅炉和混合供暖泵进行了比较LCA。这项研究的功能单元定义为在供暖系统的整个使用寿命（20年）内提供空间供暖。结果表明，在核心方案中，混合动力热泵与冷凝式燃气锅炉相比可节省30％的温室气体排放（分别为4.5E + 04 kg CO2-eq / FU和6.4 E + 04 kg CO2-eq / FU） 。与冷凝式燃气锅炉相比，混合式热泵在地面酸化，光化学氧化剂形成，颗粒物形成和化石耗竭方面的排放量减少了13％至48％。但是，就人体毒性，水消耗和金属消耗而言，混合热泵的排放量比冷凝式燃气锅炉多3至6倍。在两种核心方案中，生产阶段对金属消耗和人类毒性的影响约占50％，而在其他选定的影响类别中，使用阶段则占主导地位。天然气燃烧和电力生产是除金属耗竭和人体毒性外所有选定冲击类别使用阶段占主导地位的主要原因。灵敏度方案支持结果的鲁棒性。