The E 3300 and E 3400 were both great boilers! I just finished rebuilding another one here in my shop, the owner had left the ashes in the unit all summer every summer and allowed water to get into the top plate of the heat exchanger, it rotted that portion out. Two great things about those units were that they are simple/easy to work on with no proprietary parts and they are a sectional boiler that can be split in half, dry base on bottom and water tank on top, this allows for very easy welding repairs anyplace on the unit!