Capitol Red Top Boiler / U S Radiator Corp.

was a cast-iron, square, sectional "all-fuel" boiler series. It doesn't look too different from similar models from other manufacturers. With a decent oil burner you might get combustion efficiencies in the 70-percent range- low 80s if you're lucky.

Any further info would have to wait until you get the exact model number. You can then look this up in the Beacon Boiler Reference section of the Library (upper left).