Laars has introduced the new Mascot ST condensing tankless water heater. The natural gas or LP-fired unit offers an ultra-high 0.96 EF (energy factor) efficient stainless steel heat exchanger, full 10:1 modulation, and is available in a 199 MBH size.
Bosch Thermotechnology has expanded its Buderus brand GB162 gas condensing boiler offering. The company claims by combining condensing and cascade technologies together in one compact design provides ultra-high performance efficiencies (up to 93% AFUE) with the ability to fit multiple boiler units into tight spaces.
RBI has introduced the latest edition to its ultra-high efficiency condensing boilers and water heaters. The Infinite Energy2 (IE2) utilizes a state-of-the-art Radial Variable Circulation (RVC) stainless steel heat exchanger for maximum heat transfer and operating efficiencies of up to 98%.
Navien’s new NPE-S series condensing tankless water heaters have a rated efficiency of 0.98EF. The company claims the series is ideal for commercial and residential water heating applications and is available in three models with maximum inputs from 150,000 to 199,900 Btuh and maximum flow rates from 8.4 to 11.1 gpm.
Harsco Industrial Patterson-Kelley has launched the P-K SONIC™ boiler with Duet™ technology. The company claims the P-K Sonic boiler is the first practical stainless steel design for condensing applications in the industry.
Leaning on experience and data from various K-12 cities and projects, the author pursues some less conventional design approaches. They may revolve around radiant heating and/or cooling, but depending on school size and other factors, the smart use of heat recovery, DOAS, and improved central plants could also put a project on the HVAC honor roll.