The TC Series condensing hot-water boiler from Parker Boiler is available in 399,000 to 5,443,000 Btu input, with stainless steel construction for corrosion resistance at low operating temperatures. It offers efficiencies to 99.7 percent as witnessed and verified by a nationally recognized test lab. Units are available with conventional gas burners, digester gas, oil, propane or a combination of either. 323/727-9800;

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