I changed ours water heater out, replaced it with a on demand water heater.
Changing out a water heater is not a challenging job, but it is hard. There are some good YouTube videos on how it's done.
It's basically shutting off the gas and electricity, unhooking the water, unscrewing the outside flange, disconnecting the gas from the regulator, then just pull out the old one and install the new one in reverse.
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