I have an instant hot water heater under our office bathroom sink to provide warm water for washing our hands. The problem is that sometimes sand and sediment get into the instant hot heater causing the water flow to be restricted. This causes the instant hot heater not to turn on since the water flow is too low. I like to install a screen or small water filter in front of the instant hot water heater to filter out such sand and sediment. Any suggestions? I saw some water filters at Home Depot but they all tend to be an overkill for this application, since we don't drink the water.
The inlet to the instant hot heater is 3/8" comp.