How do i replace a broken grommet

check the elements [electric ones ] and water connections as well as relief valve if all dry then rusted out or cracked tank

The newer water heaters are sealed units, so the thermonuclear replacement is not as simple. The pilot tube, gas supply tube and the thermocple itself pass through the plate, so they must all be disconnected from the gas valve before removing the plate. Remove the plate, and the entire burner assembly along with it. Everything passes through a red grommet in the plate. Pull the grommet out and remove the bad thermocouple. Now replace and reassemble. Good luck!

Don't see why not give it a go nothing to lose

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Try using a small amount of thin set, Troll it in and be sure to leave a small gap. Let it dry and then use a high quality silicon caulk. Be sure to let that dry for at least 48 hours.

Good luck,

Marty

If there is enough water around element and lower thermostat, it's going to blow the breaker. If you don't have leaks at the pipes above, it's probably time to replace the heater. If the leak can be found and repaired, there may be hope for the heater but, if it is leaking past thermostat, you probably have a crack in the threads. Make sure, if your going to work with the wiring of the unit, that it is turned off and, if it is on, make sure you're careful and not standing in water. You could quite possibly have a cracke or broken tank.

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

Clean the crack up and expose clean metal by sanding it or a small grinder. Use JB weld it is a two part mixture that set's up hard as steel. Any hardware store should carry it.
I have fixed gas tanks,glasses and a few other thing's with it.
The main thing the surface has to be clean so the compound get's a grip to the metal. Since you already have a crack the compound will go into crack to get a inside bond.
You may use a small file or sand paper to open up the crack a little by adding a bevel to groove to expose shinning metal to get acurate bond.
Drain tank and let it dry out before attemping to fix.

They make all kind's of JB weld for different types of applications and Lowes or Home Depot will carry it.

Check out this link http://jbweld.net/index.php

you need to replace the water heater, the tank is cracked and under pressure so it is forcing the water to the nearest opening

could be fan speed or air pressure switch-is case seal sealing properly also check grommets under boiler for blowing.
YOU CAN ONLY WORK ON BOILER IF YOU ARE GAS SAFE REGISTERED.