The flat roof space of apartment buildings in Taiwan is regarded as shared between all residents, or as the de facto property of the top-floor household. A family living on a lower floor that wishes to install its own system will find it very difficult to get the other residents to agree. At present, 300,000 households in Taiwan use solar hot water systems, a penetration level of 4 %.
目前國內有三十萬戶使用太陽能熱水器，普及率達到百分之四，雖然比起未來的一百五十萬戶目標還有一段距離，但已算是成果不錯。