heater washing hole

例句：

1. 1. The heater needs to be cleaned regularly to ensure it works properly.
   加热器需要定期清洁，以确保其正常工作。
2. 2. The technician found a small hole in the heater, which could be a source of leakage.
   技术人员发现加热器上有一个小孔，这可能是泄漏的来源。
3. 3. To avoid damage to the heater, it's important to clean the washing hole regularly.
   为了保护加热器，定期清洁洗涤孔是很重要的。