The new residential boiler efficiency standards just went into effect in September, with gas-fired hot water boilers now having to be a minimum of 82 percent AFUE. Many in the industry note that sales of higher efficiency boilers have been trending up, so homeowners are already expressing interest in better efficiency.
With residential new construction barely a blip on the radar these days, most contractors have shifted gears toward educating customers about the benefits of retrofitting older HVAC units with new high-efficiency equipment. In the northeast U.S., where hydronic systems are very popular, that often involves replacing older boilers.
Redesigned and featuring 15:1 turndown for energy efficiency and low NOx emissions, the Benchmark 6000 (BMK6000) is a 6 million-Btuh condensing hydronic boiler. It has an operating efficiency of 92.5 percent. The unit measures 79 (h) by 34 (w) by 109 (d) inches.