Sofame Technologies Percotherm

Direct-contact stack condensing economizer
Very high efficiency; up to 100% (based on HHV)
Boiler seasonal efficiency improved by up to 20%
Maximum flue gas temperatures no more than 10°F (5.5°C) greater than cold water temperature at inlet
Minimum maintenance required
Reduced emission of atmospheric pollutants
No supervision required (unit is not classed as a pressure vessel)
Can be installed outside