Product News - April 2026

U.S. Boiler Citadel condensing boilers

U.S. Boiler has expanded and improved its line of Citadel condensing boilers and volume water heaters. The Citadel is now available in seven capacities from 399 to 1,500 mBh, all with 10:1 turndown. AHRI certified and rated up to 97% thermal efficiency (98% for the water heater), the Citadel is available in natural gas and propane configurations. Citadel boilers conserve mechanical room space and simplify installation. They can be stacked two-high without the need for accessory racking systems. Zero side and top clearance optimizes heating capacity per square foot of mechanical room space. Also new is the Citadel boiler’s compatibility with U.S. Boiler’s USB-Connect mobile app. The app expedites and streamlines installation, service and troubleshooting of all the company’s condensing boiler models. A standard, reinforced 3-in-1 vent connector facilitates the use of polypropylene, CPVC or stainless steel venting. 888-432-8887; www.usboiler.net

NIBCO Webstone E-X-P tankless water heater service valve kit 

NIBCO announced new Webstone E-X-P tankless water heater service valve kit enhancements. The line now features lead-free hot-water and boiler-service pressure relief valves, with redesigned forged brass construction that provides a more compact, space-saving body. The E-X-P Ultra-Compact press kits now include single O-ring press fittings, shortening installation lay length by over half an inch, and feature the new snug-fit gasket design. Enhanced products are suitable for plumbing and heating applications. 574-295-3000; www.nibco.com