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This steam boiler was installed about two years ago by another contractor. Homeowner was experiencing bad water hammer and uneven heating. The boiler is oversized by about 60,000 BTUH. We installed two 3" boiler risers and a 4" drop header. We also upgraded the main vents on three mains with GORTON #2 vents, and installed a new Vaporstat set for < 8oz.