Weil-McLain Model LG-4 Steam Boiler

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: Hi, : We have a Weil-McLain Model LG-4 steam boiler heating our three floor home (and basement). : 13 radiators (3 of which leak steam from the shutoff valve) spread over three floors. : The boiler pressure cut-off is set at 5psi. : About 3 weeks ago we noticed a smell like burning rubber and then a black oily water : along one side of the base of the boiler. I pulled the front panel off the boiler and looked under the : burners (3 total) and noticed two large rocks of calcium deposits. One of the burners was covered with : calcium deposits. I scraped off the burner to make sure the gas could get through. Still noticing : the smell and the flames from the burner with calcium are now starting to lap out the front of the : boiler. I bought a CO monitor to make sure we are not being gassed to death. So, it appears that : one of the combustion chambers has a leak and the sludge/water is dripping onto one of the burners : and clogging it... I think the smell indicates that incomplete combustion is happening. : Now a few questions: : 1) How old is our boiler? (I can't tell from the info on the boiler.) : 2) If I can find parts is it worth taking the combustion chambers apart to fix the leak? : 3) Should I be looking into a new steam boiler? : 4) Should I convert to a hot water boiler? : 5) Should I convert to heating with forced air? : Thanks for any info/advice. : Jason M