Red Seal Plumbing Practice Exam

What can cause coil damage in a low mass boiler?

1. Too much flow through the heat exchanger

2. Corrosion due to poor water quality

3. Low or no flow through the heat exchanger

4. Excessive temperature

The correct answer is: Low or no flow through the heat exchanger

Other options A, B, and D are incorrect because they do not directly relate to the mass of the boiler. Too much flow through the heat exchanger would not specifically cause coil damage in a low mass boiler. Similarly, corrosion due to poor water quality may affect the overall functioning of the boiler, but it is not a specific cause of coil damage in a low mass boiler. Excessive temperature may cause damage to the boiler, but it would not specifically target the coils in a low mass boiler. The lack of flow through the heat exchanger, on the other hand, can cause damage to the coils as it restricts the circulation of hot water, leading to overheating and potential damage. This is why C is the correct answer.