Many water heaters come with a drain valve that has a cone shaped handle. They spell trouble. Other makers of water heaters have a plastic faucet type drain valve. This type of drain valve is prone to breaks and leaks. The better types are the brass hose bib, not unlike the average garden hose bib. Even better would be brass ball valve.Brass faucet Manufacturers This type of drain valve would have a lever that can either be open or shut. The brass ball valve allows the most effective flushing of the water heater.
On most residential water heaters a 3/4 inch brass gate valve can be installed. Ball valves allow the largest opening for drain valves which gives you the best flushing of the inside of the drain valve. Shutting off a ball valve is as easy as movingBrass fitting suppliers the lever 90 degrees.
A hose bib has to be turned around and around. Also know that an adapter piece must be installed that goes from 3/4 pipe thread to 3/4 hose thread will be needed. Now you have the brass ball valve which is the least likely to clog of all the drain valves. If the brass ball valve cannot be installed, the second best is a brass hose bib.