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This is a 500-horsepower steam boiler running at 120 psi. The HeatSponge two-stage, three-section economizer is condensing the flue gas, and the overall boiler efficiency was raised from 83% to 95+%!
Green Matters on MSN11d
The 5 Best EPA-Approved Wood Stoves to Efficiently Heat Your Home This WinterBest for smaller spaces: Timberwolf 2100 Economizer Wood Stove ($1,994) Best for bigger spaces: IronStrike Grandview 300 Wood ...
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