Question

refractories on oil burners
are typically located at the top of a water heater
can never be replaced without replacing the entire water heater
can be completely inspected during a home inspection
may be masonry or ceramic fiber
are located above the burner
question 44
exhaust flues on gas- or oil - fired water heaters
should have a minimum length of 10 feet
should slope down away from the water heater to allow for condensation
should have a slope of ¼ inch per foot up away from the heater
should be friction fit together
should be cool to the touch when the system is operating

Explanation:

Question 1: Refractories on oil burners

Refractories in oil - burners are heat - resistant materials. They can be made of masonry or ceramic fiber. They are not necessarily at the top of a water heater, can be replaced without replacing the whole water heater, and are not always completely inspectable during a home inspection. They are located above the burner.

Exhaust flues should have a slope of ¼ inch per foot up away from the heater to prevent condensation from flowing back into the water heater. There is no fixed minimum length of 10 feet, they should not slope down away from the water heater, they should not be friction - fit (as this can cause leaks), and they will not be cool to the touch during operation.

Answer:

may be masonry or ceramic fiber

Question 2: Exhaust flues on gas - or oil - fired water heaters