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Because there is a leak in the pipe of the water main.
In every home thee are a number of shut-off valves. Where the water pipe enters the house is the main shut off, usually beside the PRV, a bell shaped device for regulating the house pressure. This main cold line will then branch off to the water heater, bathrooms and kitchen. Each faucet and the water heater and the toilet will have a shut-off valve. The hot water line comes out of the top of the heater and goes to bathrooms and kitchen. Each hot faucet also has a shut-off valve under it.
Yes you need to shut off the Main water valve. Usually found in the basement or outside the house near the meter. Also you need to shut off the Gas valve located at the water heater, or the Breaker located in the breaker box/ fuse panel. Sometimes the water heater will have its own Switch box, located on the power wire
On a standing pilot pilot heater is is common practice to elevate the heater 18" above a floor as flammable fumes will not ignite when the main flame comes on.Shame many plumbers /gas fitters never bother to get involved with thee NFPA
You turn off the water valve before it -probably on the sidewalk, or just on your front yard. Then remove the main valve and replace it. NOT a job for amateurs. I hope you have some experience at least.
you could buy a new one ? or call a mechanic ?
Not if the water heater is electric
No, with the main shut off, no water can be taken from the heater so it will just sit there.
Gas water heater has an orifice for main burner and for pilot light, if not electronic ignition.
No. The Main is source of water for that as well.
No.
Water is coming down from upstairs or it is back pressure from the water heater. If it is the water heater, it can come out of either side of the faucet.
Example is ,an electrical heater connected to a main switch and the heater is placed in a bucket filled with water.
Central heating systems usually heat on a different system from the hot water heater, unless the main heater is a combination furnace/hot water heater. If this is the case, it could be because the outflow of hot water is greater than the ability of the furnace to heat the water.
Electric hot water heater is used to heat cold water for use in winters. Electric hot water heaters heat water faster than the ones which consume fire in order to heat water.
To replace the TPV on a water heater a plumber will have to buy a new one. After switching off power from the mains and closing the main tap, the plumber can then replace the new TPV .
Reason for question: Plumber left valve open and flooded house The hot water (heater) tank is fed from a 'header tank'; normally in the loft space but can be combined with the main heater tank (fortic). The header is filled from the water main. Unless the header is drained or its outlet is closed off, it will drain down through the open valve of the hot water (heater) tank.