首先,2008年以后,美国发现了从岩石里提取释放天然气方法,所以美国最近几年的天然气产量越来越大,导致天然气价格越来越低,这样就很容易吸引更多的客户使用燃气用具。其次,节能节费的品牌效应。在北美,热水器的销售量大概是800万台/年,其中电热水器 First of all, after 2008, the United States discovered the method of extracting and releasing natural gas from rocks. Therefore, the natural gas production in the United States has been increasing in recent years, resulting in lower and lower natural gas prices, so it is easy to attract more customers to use gas appliances . Second, the energy saving brand effect. In North America, sales of water heaters is about 800 million units / year, of which electric water heaters