Whether you are buying a hot water heater for your personal home or a much larger boiler for a hospital, you have a lot to think about. You will need to be able to figure out the up front costs, the installation costs, how much it will be to run the boiler, the maintenance costs annually... and that is just a start. Some boiler manufacturers have expensive parts that are made just for their boilers while others have generic parts that can be bought on eBay. Consulting with a boiler sales rep is the best way to go. The list below is growing constantly, so check back often. 

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For more information, here is a website for reference:

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https://www.consumerreports.org/cro/boilers/buying-guide/index.htm