The purpose of mixing valve on a combination syste...

Gas Fitter 2 Practice Test

The purpose of mixing valve on a combination system employing a water heater to provide water for potable use and provide space heating is to

A. Mix hot water with cold water in the heating loop

B. Mix cold water with the hot water supply to the domestic plumbing system to maintain a consistent temperature of domestic hot water

C. Mix cold water with the hot water supply to the heating loop to maintain a consistent temperature of water in the heating loop

D. Return some of the hot water to the tank so that it does not run out of water

✔ Correct Answer:

C. Mix cold water with the hot water supply to the heating loop to maintain a consistent temperature of water in the heating loop