A general map to replacing a hot water heater begins with shutting off the gas or electricity and letting it cool. Then shut off the water supply to the unit. Open a hot water tap high in the supplied (yes, supplied) line so air can get in and reduce water leakage. Then drain the unit. Then uncouple the inlet and outlet water lines. Have used soaker-upper towels handy. Your failure to properly drain the unit will appear in a nasty way if you don't think through the part about draining the unit. Then disconnect the power from the unit after insuring that it is, in fact, de-energized. Or double check that the gas is shut off and remove the gas line from the unit. If there is a stabilizer strap about the unit, remove that. (If there wasn't a strap, you're gonna put one in when you install the new unit, right? Yes, you are.) Pull the unit. Replacing the unit is a reverse or this process. Double check electrical connections to be sure they are snug without over-torquing the fasteners. Or be sure to check for gas leaks with a spray bottle containing soapy water. This is critical. You blow this, you may end up dead. Or your family. Be patient and work cleanly. Don't hesitate to call a handyman if any of this sounds like a foreign language. Ask questions at a place that supplies hot water heaters, like the so called "big box" stores or a good hardware store. Consider going to a local bookstore (new or, if possible, used) and peruse a book on home repairs and upgrades. Do yourself and the bookseller a favor and actually buy the book if you find one with the information you need. Be smart about this. Shortcuts and errors can cause failures that can kill you and/or family members or damage property in a big (expensive) way. You have been cautioned, and because you are smart, a word to the wise is sufficient.
All countries have rules and regulations, only a qualified plumber may install, replace, maintain a hot water heater. Therefore the permit required would be the plumbers qualification
The most likeliest answer to this question would be that your hot water heater is unfortunately rusting or perishing from the inside, no amount of cleaning will help. your only option is to replace the hot water heater.
It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.
It's called water heater. There isn't a reason to heat hot water
if an element is constantly expanding and contracting (if you keep switching the hot water heater off and on again) all the time it causes cracks and over time the water leaks into the element causing it to short which means you have to replace it.
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You can tell if your hot water heater is bad if you notice signs like no hot water, strange noises, leaks, or rusty water. If you experience any of these issues, it's best to have a professional inspect and potentially replace your hot water heater.
There are many pictures of this on Google.
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All countries have rules and regulations, only a qualified plumber may install, replace, maintain a hot water heater. Therefore the permit required would be the plumbers qualification
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Replace the shower valve.
The most likeliest answer to this question would be that your hot water heater is unfortunately rusting or perishing from the inside, no amount of cleaning will help. your only option is to replace the hot water heater.
To replace a hot water heater thermostat, first turn off the power and water supply to the heater. Remove the access panel and insulation to access the thermostat. Disconnect the wires from the old thermostat and remove it. Install the new thermostat and reconnect the wires. Replace the insulation and access panel, then turn the power and water supply back on.
It is a water heater, not a hot water heater. There would be little point in using a hot water heater. I assume that is your point.