Tankless water heaters are becoming very popular among new homeowners. These water heaters are not complicated to add to your plumbing system. The common water heater plumbing pipes are used for the tankless also. The most important thing to know is what type of gaskets, fittings and valves to use to make the heater compatible with your current type of plumbing. This video explains what type of fittings you need for different types of plumbing pipes.