Red Seal Plumbing Complete 2025 Practice Exam

The ideal location for a circulator pump in a hot water heating system is on the supply side after the expansion tank. This placement allows for proper flow and pressure regulation throughout the system. Option A is incorrect because placing the pump before the expansion tank can cause issues with pressure and flow regulation. Option B is also incorrect because placing the pump after the boiler can lead to overheating and potential damage to the pump. Option D is also incorrect as placing the pump in the return line before the boiler can lead to air locking and decreased efficiency of the system. Placing the pump on the supply line after the expansion tank is the most optimal location for efficient and effective operation of the circulator pump in a hot water heating system.