Discover your options for water heater disposal. If you have an old heater, it’s even possible to make some money and offset the price of your new unit..How to remove the old water heater step by step guide. Don’t a plumber! Removing the old water heater is DIY home project and is not hard..Water Heater Disposal Recycling services from Junk King is just what you need for these big, bulky appliances. now .. Shut off the gas supply to the heater. . Drain water from the heater using a garden hose. . Use a tubing cutter to sever the cold and water pipes connected to the heater. . Disconnect the union that connects the gas pipe to the heater. . Remove old water heater. . Set new heater on top of blocks. . Attach exhaust flue to top of heater. . Solder new copper pipe to connect heater to cold and water pipes. . Reconnect gas line to heater. ..