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I have a Burnham boiler (hot water baseboard) that runs off propane. 1995 manufacture. Seems to do just fine up here in the NM mountains for keeping the place warm. The newer ones are probably more efficient, but I haven’t done the calculation of how long it would take to recover the cost.

I lived in a old stone farmhouse that had an oil fired Burnham cast iron boiler for hydronic baseboard heat. My friend's great aunt had it installed I. 1985... and other than not being serviced (other than emergency servicing) it had not been properly cleaned in 7 years... I tore it down and brushed all the heat exchange surfaces... The clean out plates went taken off were completely plugged with soot. After the major clean out and a new nozzle... I was able to adjust the stack temp and CO₂ and get the efficency to about 86.5%... unheard of for a 25 year old oil burner. I was impressed with the 1985 model Burnham. Well built unit.