G2 Gas Fitter Practice Exam

What device is used to extract heat from flue gases in a venting system?

1. Heat exchanger

2. Heat reclaimer

3. Heat pump

4. Heat radiating system

The correct answer is: Heat reclaimer

The device that is used to extract heat from flue gases in a venting system is the heat reclaimer. A heat reclaimer operates by capturing the thermal energy from the exhaust gases produced by combustion processes, such as those in furnaces or water heaters. This extracted heat can be redirected to preheat incoming water or air, thereby increasing the overall energy efficiency of the system. In contrast, other devices like heat exchangers are designed for a variety of applications, including transferring heat between two or more fluids, without necessarily focusing on reclaiming energy specifically from flue gases. While heat pumps can move heat from one location to another, they do not typically extract heat from flue gases. Heat radiating systems are concerned with distributing heat rather than recovering it from exhausts. This distinction makes the heat reclaimer particularly suited for applications where maximizing efficiency by utilizing waste heat is a priority.