The vertical firetube heat exchange tubes are designed for maximum heat exchange efficiency and quick and easy cleaning.

For durability, all HS-TARM Excel Boilers are constructed of 1/4 inch thick steel plate. The doors and frames are cast and machined from the finest gray iron.

The Excel boilers have been saftey tested by Omni-Test Laboratories To UL 391-1995, CAN/CSA B366.1-M91, UL 726, ANSI Z21.13-2000, and CSA 4.9-M2000 test standards for sale in the U.S.A. and Canada.