Most Reliable Hot Water Boiler

[Luke Moczydlowski]

I purchased a 12-unit building and I need to replace the boiler.  One contractor recommended a 410,000 BTU Burnham boiler.  He claims that's the best value for the money and it will last for a long time if properly maintained.  Another contractor only recommends Peerless.  I plan on keeping the property for the long run.  Does anyone have any experience with boilers?  What brand is most reliable and durable?