The CHS-399 modulating/condensing boiler from Slant Fin Corp. is available in eight models — six residential and two commercial. The boilers offer 95 percent thermal efficiency, 5-1 turndown ratio and up to 80 psi working pressure. Each model has the built-in capacity to cascade up to eight total boilers with up to a 40-1 turndown ratio. Common venting of two or three commercial boilers is available. Cascading ensures the boilers operate at peak performance with built-in backup for efficient and reliable heat. The control includes outdoor reset or setpoint water options that can be applied as a fully condensing multiple boiler system or as a hybrid system combination condensing/noncondensing system. 516/484-2600;
www.slantfin.com.