I would suggest you do not replace the coil on a 30 year old boiler... putting $1000-1200 into a boiler that old is asking for trouble! Especially if the boiler decides to leak shortly after you spend the money! As has been suggested, either install an indirect or stand alone tank, either electric or if you already have propane, a power vented one. You can check if the coil is the problem merely by drawing hot water and grabbing the hot side of the coil... is it blistering hot or does it become out warm. It better be blistering hot! Please stop calling boilers furnaces... there is a DIFFERENCE!
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