In a previous brief, we discussed that the largest heat loss from a boiler is through the stack. An economizer can reduce these losses and increase the overall boiler efficiency by about 1% for every 40º that the exhaust temperature is reduced.
A stack gas economizer is a good fit for most boilers that meet three criteria:
1. High hours of operation. The economizer only saves during periods when the boiler operates. Therefore, in a multi-boiler plant, it may only be cost-effective to install an economizer on the lead boiler.
2. Potential for heat transfer. The cooler the exhaust is, the less heat there is available for recovery. A boiler with 350º F exhaust has limited potential unless a condensing economizer is installed. Also, small boilers may not be cost effective due to the limited savings potential.
3. A heat sink that can use the heat as often as possible, preferably all year.
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