Gas Fitter Practice · Question

What is the purpose of a thermal expansion tank in a closed-loop hydronic heating system connected to a gas boiler?

A thermal expansion tank absorbs the expanding volume of water as it heats, preventing excessive pressure buildup in the system.

Start free practice for Gas Fitter Practice

200 questions · no signup required · 40 free questions per day

Question: What is the purpose of a thermal expansion tank in a closed-loop hydronic heating system connected to a gas boiler?

Answer options:

To store hot water for domestic use ✅ To prevent over-pressurization due to water expansion
To filter sediment from the system water
To increase the heating capacity of the boiler

Correct answer: To prevent over-pressurization due to water expansion

Explanation: A thermal expansion tank absorbs the expanding volume of water as it heats, preventing excessive pressure buildup in the system.

Start free practice for Gas Fitter Practice

200 questions · no signup required · 40 free questions per day

More about Gas Fitter Practice

Free, no signup required. Build a wrong-question list as you go.

Other Canadian certifications candidates often prepare for alongside this one.