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Here are a few pictures of a sick puppy destroyed by chemical treatment and negative pressure at a local golf course. They use the steam boiler year long to provide heat and hot water. We replaced it with a Smith High Efficiency 28. I was at a wine tasting there last night and took this picture of the completed job which we did during February. We welded all the pipe! The boiler was running on low fire with a flue temperature of 400F and a lovely flame. BTW, we disconnected and threw out ALL the chemical treatment. The golf course has two 10,000 water tanks and performs its own water treatment. Water quality is not an issue.