It si 7 years old an leaking inside the unit on top of the burners

Clean burner tube with proper brush, such as long spring type for bar-b-Q burner tube that are available at most hardware stores, and make sure you have new burner tube aligned properly (straight on) with brass orifice on gas control. Then be sure to adjust air shutter for nice blue flame, with little orange at tip. Do not give so much air that flame roars or jumps off the end of the burner tube. Too many people think more air, less fuel, but actually, when flame roaring and jumping off end of tube, the heat passes through faster and it takes longer to heat the water inside the tank. Like I said, only enough air to have quiet, steady blue flame. If your not giving it enough air, you'll see dark soot on trailer above water heater, which indicates burning too rich, need more air, or perhaps pilot is partially plugged. Pilot flame should also be blue, not yellow/orange. Small air intake hole on side of fitting just before pilot tube can get spider web, or debris in it as well. Use air to blow that out or a piece of wire like a paper-clip to clean inside that hole.

Thanks I ended up replacing the unit as I thought it would be expensive to repair and it's age didn't help

You are sure it is LEAKING pater at all those 4 locations-- correct?
None of the water is from condensation, right?

If you have had pressure water leaks for many years-- then likely a lot of damage has been done to the insulation-- and the sheet metal outer liner?
Does the sheet metal 'skin' (outside jacket get real warm?-- if so, you are loosing a lot of energy -- Probably time to invest in a new, better insulated, and more efficient combustion burner-
and this time, Make sure there are NO LEAKS, when the installation is done!
Mack B

If water heater is leaking, then open following 2 links to avoid tank rupture and troubleshoot leak:
http://waterheatertimer.org/Emergency-steps-for-leaking-water-heater.html
http://waterheatertimer.org/Water-heater-is-leaking.html

Open following link if you want to install your own gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

To have gas water heater installed, can run $2-300 for installation plus cost of heater.
40 gallon natural gas water heater at Lowes starts at $300+, and tanks with longer warranty cost more and last longer.

If you maintain the tank: keep chemicals out of same room as water heater, attach bare copper ground wire between hot and cold pipes, flush tank each 6 months, clean burner each year as shown in manual, read the manual entirely for specific information about your model, and inspect/replace anode rod every 2-3 years then basic 6-year tank can last much longer.
http://waterheatertimer.org/Replace-anode-rod.html
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

My unit is 3 1.2 tears old. It started to delay the flowing of hot water. Today I held the lever down until hot water came out but I noticed water leaking from inside the unit. I figured that the tank failed, and since it was over 3 years old I decided to open it up. What I found was that there is a plastic tube at the top of the unit that was very discolored and brittle which developed a crack. when I touched it it completely severed. I called the Insinkerator hotline at 1800-558-5700 and they told me that opening the unit voids the warranty. I said that it appears to be out of warranty and I needed just the plastic tube for repair. The per on on the phone said that as a one time courtesy that a new unit would be shipped to me free of charge and that I could install it myself or they will have a tech do it. I opted to do it myself. Hope this helps

If you know a little on mechanics try to disassemble the unit in order to clean it inside.Or get an Electrician to repair it.Those unit works like the electric ranges.The heating sys of the water has inside electric parts that with the time get burn.

if you check the bottom of the tank or there is water on the floor constantly..check the top of the tank most of the time the shut off valve is leaking or the hot cold connection on the top is leaking..if both these are dry then there could a crack in the tank

Sounds like you have a bad thermostat. You can change the thermostat, but if the heater is more than 8 or 10 years old you might be better off to replace the entire heater. Thermostat replacement is easy:
1 turn off the gas 2 drain the heater 3 unscrew pilot, main burner, and thermocouple lines from bottom of thermostat. 4 unhook gas line from thermostat. 5 unscrew thermostat from heater tank. Use pipe sealer when you install new thermostat, and gas line fittings. burner and thermocouple lines seal on a taper seat and do not need sealer. after reassembly check for leaks with soapy water, not a match, light the pilot and turn up the temp. The heater may sweat quite a bit while it is heating up the first time, this is due to the cold water on the inside and the fire on the outside. some water may drip in the bottom of the heater and you might think you have a leak, but let it heat up completly, if the water is still dripping after the tank is hot then you need to find the leak.

If the water cooler is more than 10 years old, the cathodic rod is probably all used up and the tank itself is taking a big hit with corrosion. Replace the water heater if the above is true. Otherwise on newer tanks, pull the heating element access panels, scoot aside the insulation, and look for leaks. Look for leaks at the spigot and at the top connections. For gas units, look for leaks only at the plumbing connections. Gas heaters might last 15 years before replacement is needed.

problem is pump-must replace- there is a valve inside unit that holds pressure to about 150psi -it is leaking by when unit shuts down- causing problem. If left unrepaired you could blow chimeny connection with bad ignition. good luck