As of 2015, technical support for Rinnai heaters can be obtained by calling 1-800-621-9419 Monday through Friday between 8:00 a.m. and 8:00 p.m. EST. Callers should be prepared to provide the product's serial number when calling for support.
Rinnai's official company website at Rinnai.us also offers visitors the ability to email customer service and provides a range of product manuals for customers. Those needing service or repair can use the website to locate authorized service dealers in any given area, as well as view warranty details about specific products. Information on product recalls and the ability to obtain extended warranty coverage are also available on Rinnai's website.