Master Plumber Practice Exam

Question: 1 / 400

How far within a water supply system must unions be installed to a water heater?

36 inches

12 inches

The requirement for installing unions within a water supply system to a water heater is primarily to facilitate future maintenance and replacement of the heater. The correct distance of 12 inches allows for easy disconnection of the water heater without needing to cut into the piping, which can save time and prevent potential damage to the plumbing system.

Installing unions within this distance ensures there is enough accessible space to maneuver tools and safely remove the unit when required, such as for repairs or replacements. This practice adheres to plumbing codes that seek to promote safe and effective maintenance of plumbing systems.

Other options do not align with standard practices or regulatory codes concerning accessibility, as they may place too much distance between the unions and the water heater, making future service more complicated.

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24 inches

48 inches

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