The most important goal of every water distribution system is to deliver water to the consumers in the demand and time determined by its users. However, not all water usages require the potable water quality. One of the technical solutions enabling water recycling and its reuse is a dual installation system. Dual installations recycle rain wastewater or grey water from bathtubs, showers and sinks and further reuse it for irrigation or toilet flushing. The profitability of a dual installation system is highly dependent on the water price, which tends to vary significantly according to the location. The purpose of this paper is to evaluate the profitability of dual installation systems in exemplary hotel building hypothetically located in 10 different European countries. The profitability was determined on the basis of multi-criteria decision analysis performed for two installation variants. The investment was evaluated in terms of technical, economic and environmental aspects. As a result, the selected countries were ranked in order of the most profitable location for dual installation system’s investment.

每个水分配系统的最重要目标是按照用户确定的需求和时间将水输送给消费者。但是，并非所有用水都需要饮用水质量。双重安装系统是实现水循环利用和再利用的技术解决方案之一。双重安装可回收浴缸，淋浴器和水槽中的雨水或污水，并进一步用于灌溉或冲厕。双重安装系统的盈利能力高度依赖于水价，水价往往会因所在位置而有很大差异。本文的目的是评估假设位于10个不同欧洲国家的示例酒店建筑中双重安装系统的盈利能力。根据对两个安装变体进行的多标准决策分析来确定获利能力。根据技术，经济和环境方面对投资进行了评估。结果，按双重安装系统投资的最有利可图位置的顺序对所选国家进行了排名。