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Life expediency for a Burnham residential boiler?
Here's a mid-summer question: I have a 1989 mid-size Burnham gas boiler (Independence?) for a single family house I recently bought. The two previous owners have been religious about yearly servicing and biweekly LWCO blow-downs plus occasionally draining a few pints until it runs clean. People look at the boiler and are surprised it's 30. When I got the house the pressure was on the high side (~4psi) but it's since been replaced by vaporstat which is set for as low as it will go -- about 10oz. The heating system seems to run fairly well although I feel like the risers (which I assume are original) seem a bit undersized for some radiators.
I had a plumber in for a estimate for another project who noticed the boiler and gave a bit of a hard sell to replace it now, claiming there's a $2k incentive available if replaced when functional. Given the fact the system runs OK I'm disinclined to spend the $$$$ to replace a functional boiler.
So my question to the experts: Is there any reason to think the boiler is at or nearing the end of it's life? And/or, should I replace the MM float type LWCO now (it's well beyond 10 years old) even if it tests fine?
I suspect it should be skimmed which is on my project list.