Question

a side arm heater
is a variation on a tankless coil
is added to the side of a domestic water heater
is typically located at each fixture requiring hot water
has a gas burner
has a high - efficiency oil burner

question 10
all of the following are common problems with oil burners except
draft hood obstructed
inoperative
incomplete combustion
excess noise or vibration
too close to combustibles

Explanation:

A side - arm heater is added to the side of a domestic water heater. For the second question, a draft hood obstructed is a common issue with gas - burning appliances rather than a typical problem specific to oil burners. Inoperative burners, incomplete combustion, excess noise or vibration, and being too close to combustibles are common problems with oil burners.

Answer:

First question: is added to the side of a domestic water heater
Second question: draft hood obstructed