Tankless water heaters require various tools and operations during installation, which are an essential part of the plumbing process. Some commonly used tools for installing tankless water heaters include groove-joint pliers. Measuring and layout tools play a crucial role in ensuring precise plumbing dimensions. Plumbers use instruments like tapes, rules, squares, levels, plumb bobs, chalk lines, compasses, and dividers. Accuracy is essential in plumbing, and these instruments must be capable of measuring within fractions of an inch over several feet. Steel tape measures are often preferred for their convenience, with retractable blades that can be quickly stored with one hand. Plumbers may use long tapes with steel or fiberglass blades for locating terminal points or measuring long pipe runs. It is crucial to keep these tools clean, dry, and free from kinks to ensure their proper functioning and accuracy during plumbing installations.