Gas Fitter Practice Test

Is leaded solder permitted on the heating portion of a combination domestic heating/hot water system?

1. Yes

2. No

3. Only with special certification

4. Only in low-pressure systems

The correct answer is: Yes

Leaded solder is generally not permitted in the heating portion of a combination domestic heating/hot water system due to health and safety concerns related to lead exposure. Lead can leach into the water, posing significant risks to human health, especially in systems that deliver drinking water. Modern regulations and standards emphasize the use of lead-free solders to ensure safe drinking water. While the answer suggests that leaded solder is permitted, in practice, it is typically restricted or banned in many jurisdictions. Other options, such as the need for special certification or limitations to low-pressure systems, reflect the necessity of adhering to safety and public health regulations, further supporting the stance against the use of leaded solder in these systems.