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Well, you can if it's an electric unit. If it's gas, you can do the work yourself but call the gas company to check your work before you light it.
You Will Need:
A water heater that is at least as large as the one you're replacing A water heater installation kit Two wire nuts--they need to be big enough to hold two 10AWG wires twisted together A set of vise grips A pair of pliers A tool that can cut and strip 10-gauge electric wire Two screwdrivers, one flathead, one Phillips Two big crescent wrenches A tubing cutter if your water heater's plumbed with copper, or a hacksaw if it's plumbed with PVC Som e plumber's emery cloth (like sandpaper, but it's about an inch wide and comes on a roll) A garden hose The mop Enough pipe insulation to wrap the pipes going into and out of the water heater
You might need A 30-amp double-pole breaker for your brand of breaker box A roll of 10/2WG NM electric cable A drain pan for the water heater A drain tube for the T&P relief valve A water heater strap if you're in hurricane, earthquake or tornado country
Step one: Go to the breaker box, figure out which breaker runs the water heater, and turn it off. Then look at the breaker: if it doesn't have the number 30 printed on it--implying that it is a breaker that will trip when more than 30 amps of current are asked to go through it--you need the new breaker and the new wire. If the electrician who wired your home wasn't a total fly-by-night communist heathen piece of shit like mine was, you should have the correct breaker and can go on to the next step.
Step two: You should see three things coming out the top of your water heater: the cold water inlet, the hot water outlet and the electric cable. If you have enough slack in your cable to do it, just chop the cable off as close to the water heater as you can. If there isn't much slack, you'll see a cable clamp in the middle of a plate on top of the water heater, with the cable sticking out of it. Undo the screw on the clamp and the screw holding this plate down, remove the plate, and cut the three wires as close to the wire nuts/ground screw as you can. Turn the water valve on the cold water inlet off. Use the tubing cutter to cut the two pipes leading into the water heater as close to the elbow that makes them turn down into the unit as you can. (For the longest time, it was The Thing To Do to solder pipes directly into water heaters. Now it's against code in most places and a really bad idea everywhere else to not plumb water heaters with at least 18" of flexible line into the unit.) Either on top of or on the side of the unit is a brass thing with a flip lever on it. This is the Temperature and Pressure Relief Valve, one of the greatest inventions of all time in that it has completely eliminated the danger of water heater explosion, and has saved the lives of countless homeowners. There may be a drain tube screwed into it. If there is, remove said tube and hang onto it. At the bottom of the water heater is a valve with a garden hose thread on it. Hook the garden hose to the water heater, put the other end outside and open the valve. When the water heater has drained completely, go to...
Step three: Haul the old water heater outside and call the city to come get it.
Step four: Take the new water heater out of the box. You will note that it looks pretty much like the one you just removed.
Step five: Put the drain pan on the floor, if you don't have one already, and put the new water heater in it. Screw the drain tube into the T&P relief valve. Get out your water heater install kit and you will find that it contains two Close Nipples (the silver things with threads running all the way up both sides), two compression fittings (the big brass things you never saw anything like before), two hoses--either braided stainless (the kind you want) or corrugated copper (I have this kind, which is how I know you want the other), and a roll of teflon tape. Wrap one end of each nipple in tape and screw it into the water heater. Right now it doesn't matter which. Go to your two pipes and first sand the ends to clean them up, then take a compression fitting and look at it. You will see that one end has threads, just like the nipples do, and the other has a big nut that comes off. Remove the nut and you will find a copper ring. This is your compression ring. Slide a nut on one pipe, slide the compression ring on, put the rest of the compression fitting on the pipe, and screw the nut on the fitting. Then use the two crescent wrenches to tighten the hell out of the fitting. Wrap the exposed threads of the fitting and the nipple with teflon tape, then screw a hose between the compression fitting and the nipple on the right side. The cold water line always has a valve in it, the hot water line never does. To tighten the nipple, put a wrench on the hose end and turn it; the nipple will screw in real nice. Do both sides, and insulate the pipes.
Step six: Take the plate off the top of the unit. Somewhere in the box is a cable clamp. Put it in the hole where the cable will go through, and tighten the nut. Stick the cable through the clamp and strip it. You will find a black and a white wire plus a bare one unless, once again, your electrician was a cheap bastard. (If he was, you'll need to ground the unit by clamping a ground wire to the cold water line if it's metal.) The bare one's ground. There's a green screw in there. Loosen it, bend the end of the ground wire into a little book, and loop it around the ground screw. Tighten the hell out of it and go on. Then strip the black wire in the cable and in the unit (about an inch should do), clamp them together side-by-side with the vise grips, and twist the two bare wires together really tight with the pliers. Put on a wire nut and do the same thing with the white wire. Button your water heater up and go upstairs.
Step seven: Open every hot water faucet in your house, then open the valve feeding cold water to your water heater. Look for leaks. If you see any, turn off the water and fix them. If you don't see any, go to the faucet farthest from the water heater and wait until you get a nice steady stream of water without any sputtering from the 50 gallons of air you're forcing out of it. When this happens and you've got a nice neat stream of water, turn the faucets off and turn on the breaker. If you don't hear any crackling or popping, and you shouldn't, wait half an hour or so for the water to warm up.
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