Each year, Plumbing & Mechanical Engineer editors receive thousands of product releases from industry manufacturers. The 20 products highlighted here have earned the distinction of being PM’s Top Products of 2021 based on the number of page views on pmengineer.com Congratulations to those products on this year’s list.

Here’s a countdown of the top 10 articles you read the most in 2021 based on the number of unique pageviews on www.pmengineer.com.  

Laars Heating Systems’ ultra-high-efficiency floor-standing FT series combination boiler and water heater is the only residential combi-boiler that simultaneously supplies abundant home heat and endless hot water without interruption, the company states. 

Navien’s new NCB-H condensing combi-boiler is packed with industry-leading features, including the highest residential DHW Btu: up to 210,000 per hour, cascade and common vent capabilities with NPE tankless water heaters, advanced controls with intuitive display, and the highest full lineup 2” vent length, up to 65’, the company notes. 

With numerous benefits such as compact sizing, high-efficiency operation and cost effectiveness, it’s easy to understand why the combi-boiler market is growing. 

According to a report from Global Market Insights, the U.S. boiler market is projected to reach $4.5 billion by 2025, a 3.3% increase since 2018.