Patterson-Kelley is excited to introduce their very first firetube boiler, the P-K SOLIS®! This top-of-the-line, highly efficient condensing boiler is designed to maximize comfort without sacrificing savings or floor space. Each P-K SOLIS® model features a unique geometric design that optimizes heat transfer, resulting in efficiencies of 97%, 10:1 mechanical turndown, and ultra-low NOx emissions.