Triangle Tube’s Prestige Cascade boiler systems are designed for inputs from 800,000 to 2 million Btu/hr. and come with an easy-to-install combination piping and rack. Up to five Prestige Solo 399 boilers provide redundant security and a turndown of up to 18:1. The boilers can be piped in reverse return or primary-secondary piping arrangements. The optional Common Vent joins up to three boilers in one vent for minimal wall penetrations.Triangle Tube. Circle 5