www.supplyht.com/articles/92709-product-preview-commercial-high-efficiency-boiler
Product Preview...Commercial High Efficiency Boiler
November 1, 2008

Heat Transfer Products’ new ModCon Commercial High Efficiency Boiler is available in 301 MBH, 500 MBH, and 850 MBH sizes and features a high-grade, load-matching gas burner with a five-to-one turndown ratio to meet the variable needs for space heating and domestic hot water in a single application. These boilers can be stacked, two at a time, to double capacity while maintaining the same small footprint.
Heat Transfer Products.
Circle 234