What should be fitted at the bottom of the cold feed pipe to the hot water cylinder?

At the bottom of the cold feed pipe to the hot water cylinder, a drain valve is specifically fitted to facilitate the draining of the cylinder. This is essential for maintenance purposes, as it allows for the removal of water from the cylinder during repairs, routine maintenance, or if a replacement is necessary.

The presence of a drain valve ensures that, when the need arises to empty the hot water cylinder, such as for sediment removal or inspection, it can be done quickly and efficiently. This is particularly important for maintaining the longevity and performance of the hot water system, as it allows for the removal of debris that can accumulate over time and affect heating efficiency.

In the context of plumbing safety and regulations, fitting a drain valve also aligns with best practices, ensuring that technicians have the means to properly manage water disposal in compliance with local building codes. Thus, the use of a drain valve enhances safety and functionality within a plumbing system.