The P-K MACH condensing boiler featuring 10:1 turndown capability. It will be introduced at the 2019 AHR Expo.

By limiting turndown to 5:1, Patterson-Kelley can maintain the dewpoint as high as possible, which allows for greater condensation, according to the company. Aggressive turndowns typically lower the dewpoint, which reduces condensation. However, in an application where the system is sized at a higher capacity than required, higher turndown, like 10:1, can accommodate the imbalance by turning down the input to match the required load. Patterson-Kelley.