Extended Warranty Options in the US

ACV Triangle Tube is pleased to offer extended 5 and 10 year labor and parts protection plans for the Prestige, Challenger, and Keystone Boilers. *For residential application only. All program correspondence will be handled directly with CornerStone, the Plan Administrator.

CornerStone United
Eastway Plaza
1899 Tate Boulevard, SE - Suite 2110
Hickory, NC 28602

Phone: 800-824-5090
Fax: 828-345-1918

  • All necessary forms are available for download below or from CornerStone.
  • Contractors will send the registration form and their remittance directly to CornerStone.
  • Homeowners will receive a congratulations letter welcoming them to the program containing the contract information directly from CornerStone.

If you have any questions regarding the ACV Triangle Tube Extended Homeowner Protection Plan, contact your Triangle Tube Sales Representative or CornerStone directly.

    • Contractor Registration Form

    • 202 KB

    • Extended Warranty Application Form

    • 225 KB

    • How to Submit a Claim Instructions

    • 208 KB