Combi-Boilers vs. Traditional Furnaces in Illinois
Illinois homes trying to cut heating costs often compare two paths: upgrading to a condensing combi-boiler (which provides space heat and domestic hot water in one unit) versus installing a more familiar traditional furnace paired with a separate water heater.
The headline trade-off is straightforward: furnaces can be effective, but they frequently waste some energy through flue gas heat. Condensing combi-boilers are designed to capture more of that heat—turning it into useful warming and hot water—especially when conditions allow the system to run at efficient temperatures.
How efficiency is measured (and why it matters)
“Efficiency” isn’t a single number across all setups. Furnaces typically earn high ratings through steady performance under specific test conditions. In contrast, condensing boilers are rated based on how much heat they recover wh ... Read more »

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