The Rinnai Water Heater Screw, part number 108000021, is a factory-authorized replacement fastener engineered for use in compatible Rinnai tankless water heater assemblies. This screw is manufactured to meet original equipment specifications for thread type, length, and fit, ensuring proper attachment of cabinet panels or internal components during operation and servicing.
It is commonly used during maintenance or repair to replace stripped, damaged, or missing hardware while maintaining manufacturer design standards and equipment integrity.
This replacement fastener supports secure panel retention and internal component stability within approved Rinnai tankless water heater units. Proper installation helps maintain structural alignment and prevents loosening during normal heater operation or servicing access.
It is intended for use in locations specified in the Rinnai service manual and should be installed with power disconnected and in accordance with manufacturer guidelines.
What’s Included: One Rinnai 108000021 replacement screw.
Installation Limits: For use only in approved Rinnai tankless water heater models and in designated fastening locations specified by Rinnai; must not be substituted with non-OEM hardware.
Compatibility: Compatible with Rinnai tankless water heater models requiring part number 108000021 as a direct replacement fastener.
