Oldie
Hi just replaced a gravity water boiler internet for unit apartment house that we own simply because I know it's going to go one winter and I don't want to have to scramble. This boiler has been in operation since 1947 and has been serviced by the same company since its installation that year. That very company replaced it with a $20,000 super condensing natural gas boiler just last month. We kept all the radiators, they ended up installing 1200 ft of PEX pipe to service all these radiators. Frankly, if I wasn't worried about Maine winters, I would have left the boiler going forever. No circulator pumps, simply a steam type boiler but instead of steam all the piping and radiators are filled with hot water. The boiler heats the water, which of course expands the molecules, it pushes that hot water up through the system through the radiators until it reaches the top four where it begins to cool, the molecules condense and it rushes its way back to the boiler to start the process all over again. A giant marshmallow looking asbestos coated hunk from a Stephen King novel, wavering away since 1947 without a hiccup.