Anyone with experience/knowledge on Lennox COWB3 oil boiler?

Had a contractor come quote me last week and this is what he proposed. He mentioned how the Lennox boiler was made by Dunkirk and has cast push nipples instead of gasket or steel nipples = good leak reliability. Throughout getting quotes and doing lots of internet searching over the past couple of months, I dont think I saw a single shred of info on Lennox or really any newer Dunkirk. Any general info would be appreciated.