Rheem 71000 Manual Better |link| Direct

Clearance is Non-NegotiableThe manual may state a minimum of 12 inches of clearance, but for ease of maintenance, aim for 24 inches. You will thank yourself when you need to replace a heating element or an anode rod five years from now.

Open the drain valve and let the water run until it flows completely clear. Checking the Anode Rod (Every 2–3 Years) rheem 71000 manual better