Starting Sept. 1, 2012, all residential boilers must be manufactured to meet new minimum federal efficiency standards. Residential gas hot water boilers must meet 82 percent AFUE; gas steam boilers, ...

Steam is sent to radiators, while hot water flows to radiators or radiant heating systems. Boilers are fueled by natural gas, heating oil, propane, electricity or a biodiesel-oil blend.

The boiler operates at existing distribution voltages, 4.16-25 KV with up to 99.9% efficiency, and can produce up to 170,000 pounds of steam per hour. With pressure ratings from 105-500 psig, the ...