To the point. . Replacing a oil boiler to gas. Considering the Pioneer with indirect . The pioneer versa combo or the Columbia Power vent I think it's CSVB. Has anyone had experience with the pioneer boilers. The warranty is 12 years where as with the Columbia the warranty is life time...I live in Baltimore , 1800 sq ft 1932 medium insulated. Burnt about 500 gal a year...two contractors both suggested 150k for boiler size,, any suggestion is appreciated. Thanks !!