No. Hot water directly from boiler is not potable.
"How much" as a question is quite vague. Some hot water heaters are comprised of copper only. So this now depends on the size of the hot water heater. Some hot water heaters have no copper whatsoever.
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The heating element whether it be electric or gas is located close to the faucet so that the water flows through and is heated on its way to the faucet therefore you need a separate unit for each sink. Above answer is called a "on demand unit", a tankless coil for a hot water boiler uses a spiral coil of copper that is bolted into your boiler, with the hot combustion gases heatintg the coil of copper that has the domestic cold water flowing thru it, heating the cold water into hot water as it travels to your faucets.
A boiler functions by boiling water to a steam, which rises upwards. Keeping the hot water tank above the boiler helps keep the hot water hot, as well as allowing the steam to carry itself to the tank, instead of the hot water tank producing steam feeding back into the boiler.
It will cost about $60.00 to replace a hot water gasket valve on a boiler. This is if you do it yourself. If you hire a professional, they will charge you for labor and the ending cost will be much more.
So the steam can rise from the boiler to the hot water tank storage
NONE a boiler is a boiler and a water heater is a water heaterSEE ASME section IV or the NBBI
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Copper is used as hot water pipes because the copper will not corrode when the hot water goes through the pipes
Much more information needed. -Is this really a 'boiler' or a hot water heater, what is to repair etc. -Usually if a hot water heater tank is leaking it must be replaced. . . . Give proper information and get a better answer.
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