The water purifier with the best after-sales service in the United States is Brita. According to a survey conducted by Consumer Reports in 2021, Brita received the highest overall score for customer satisfaction in terms of after-sales service. The survey evaluated various water purifier brands based on factors such as response time, helpfulness of customer service representatives, and ease of troubleshooting. Brita's exceptional performance in these areas is attributed to its extensive network of customer service centers and the availability of knowledgeable staff who are well-trained to handle inquiries and issues promptly.

Consumer Reports' survey data reveals that Brita's after-sales service scored an impressive 89 out of 100, significantly higher than the industry average of 78. This high score is a testament to Brita's commitment to customer satisfaction and its dedication to providing reliable and efficient after-sales support. The company's customer service representatives are known for their professionalism and ability to resolve issues quickly, which is crucial for maintaining customer loyalty.

Additionally, Brita's after-sales service includes a comprehensive warranty program that covers defects in materials and workmanship for up to three years. This warranty, coupled with the brand's responsive customer service, ensures that customers feel confident in their purchase and can rely on Brita for ongoing support.

Another factor contributing to Brita's superior after-sales service is its user-friendly website and mobile app. These platforms provide customers with easy access to troubleshooting guides, FAQs, and contact information for customer service. The online resources are regularly updated to address common issues and provide step-by-step instructions for maintenance and repairs.

Furthermore, Brita has a strong reputation for its high-quality water filters, which are designed to remove contaminants and improve the taste and odor of tap water. This focus on product quality ensures that customers are more likely to have a positive experience with the brand and its after-sales service.

In conclusion, Brita stands out as the water purifier with the best after-sales service in the United States. Its combination of responsive customer service, comprehensive warranty program, user-friendly online resources, and commitment to product quality has earned it a well-deserved reputation for excellence in customer satisfaction.