After Sales Services provided by Marathon

For products with existing manufacturer’s warranty coverage, Marathon provides warranty services for the following Baxi products:

Boilers with Serial Numbers starting with the number 15
Certain Boilers with Boilers with Serial Numbers starting with the numbers 16 or 17

If you are seeking warranty services for a Boiler with a Serial Number starting with the number 15 or lower, please contact Marathon at 1-800-461-4657

If you are seeking warranty services for a Boiler with any other Serial Number please contact Baxi Customer Support at 1-844-422-9462.