Here’s an uncomfortable number: on many boilers, 15–20% of the fuel you buy leaves as hot exhaust — straight up the stack. A condensing economizer is one of the most effective ways to stop paying for that wasted heat.
Where the energy goes
Combustion produces hot flue gas full of usable energy — both the obvious “sensible” heat and the “latent” heat locked in water vapor. Vent it to atmosphere and you’re exhausting money. The colder you can make that exhaust before it leaves, the more fuel you recover.
How a condensing economizer works
A condensing economizer captures heat from the flue gas and transfers it into your feedwater or makeup water. By cooling the exhaust below its dew point, it also recovers the latent heat of condensation that a conventional economizer leaves behind — so it takes less fuel to reach the same steam output.
Trap Energy Solutions specifies and installs condensing economizers from Cannon Boiler Works, engineered for durable, high-efficiency heat recovery on commercial and industrial boilers.
What it means for your bottom line
Every degree you pull out of the exhaust is fuel you don’t have to buy. Depending on your load and current stack temperature, a condensing economizer can lift overall system efficiency by several points and deliver a payback measured in months, not years — while trimming your carbon output at the same time.
Beyond energy: the CRES view
Maximum energy savings is the headline, but heat recovery supports the other CRES pillars too — steadier feedwater temperatures improve reliability, lower stack temperatures and emissions help with compliance, and a properly engineered installation protects safety.
Curious how much flue-gas heat you’re throwing away? Talk to us about a condensing economizer — we’ll help you size the opportunity and the payback.