The Prestige Excellence combination boiler from Triangle Tube features an inner and outer stainless steel tank for corrosion resistance. The combination boiler is 95 percent energy-efficient with up to 5.5-1 turndown ratio and the ability to maintain 3 gpm of hot water. The ACVMax control system offers a mixing-valve function for dual temperature heating as well as fully programmable circulator control with three available outputs. Additional features include 60-second setup, intelligent troubleshooting and integrated cascade. 856/228-8881; www.triangletube.com.