Since its arrival in the U.S., crosslinked polyethylene PEX) tubing has taken the hydronics industry by storm. That is primarily due to its reputation as being a durable, flexible, and, some might even say, more affordable option for radiant heating and snowmelt applications.
The Aspen and Aspen Light commercial condensing boilers feature a 10:1 turndown ratio, efficiencies of up to 96 percent AFUE, and boast low emissions. With a stainless steel, vertical, firetube heat exchanger, the Aspen line includes seven sizes between 85-399 MBtuh, with a 155-MBtuh combi unit available.
All technicians at some point will need to call and speak with a manufacturer’s technical support adviser. I have made many calls to these advisers throughout my career and learned how to best get the information I needed from them.
Energy Star certification is an important distinction for HVAC manufacturers’ products to achieve. The designation recognizes highly efficient performance, and 2017’s list of the most efficient boilers delivers a bevy of products from a wide range of manufacturers.
The Noritz Residential Combination Boiler (NRCB) allows for simultaneous residential domestic hot water and space heating and performs at 95 percent AFUE. Unlike traditional combination boiling systems, which can provide only space heating or hot water at any given time, the NRCB’s simultaneous capabilities are easy to control and especially beneficial for applications that do not store or deliver heat energy efficiently.
The Free Flex Ultra-High Efficiency Commercial Condensing Boiler offers a thermal efficiency of 95 percent and features Bryan’s weld-free design. The Free Flex permits field access to the heat exchanger for cleaning and an unprecedented tube replacement.
The Sierra Club, a grassroots environmental organization, announced it would be joining nonprofit public interest law organization, Earthjustice; the Consumer Federation of America; the Natural Resources Defense Council (NRDC); and a coalition of state attorneys general in filing a lawsuit against the Trump administration over the U.S. Department of Energy’s (DOE) delays in issuing new energy-efficiency standards for ceiling fans, freezers, boilers, and commercial and consumer goods.