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4

A - Expansion tank. This prevents the pressure increase due to heating water, from damaging the plumbing. The tank is filled with air, that is separated from the water by a bladder. When the water expands due to heating, water compresses the air absorbing the pressure. B - Check valve (or back flow valve). This is designed to only allow water to flow in ...


3

The white pipe at the top left appears to have a thermostatic mixer valve. That's the output side of the water heater. To avoid running out of hot water too quickly, the tank is set to a somewhat higher temperature than is actually desired, and this valve mixes that with cold water to get the actual temperature and sends that to the rest of the house. The ...


0

That depends. If the water heater in question has a pilot light, as opposed to an igniter, then probably not, but if there is an igniter and not a pilot light, the fuse for the igniter could blow as the igniter tries to light a nonexistent gas flow. As far as physical damage to the water heater itself, I don't see how. A fuse is a pretty minor fix. And if ...


7

According to National Electrical Code, the pipe has to be bonded. However, it can be bonded using the grounding conductor serving the equipment that uses the gas. ...The equipment grounding conductor for the circuit that is likely to energize the piping shall be permitted to serve as the bonding means... As for lightning strikes, the gas company is ...


0

Make sure the output on your regulator is set correctly -- probably about 10" WC.


3

It's not, exactly, frozen. Liquified Propane Gas maintains a pressure in the tank proportional to the temperature of the tank/gas. You might have noticed that the tank was quite cold - as you use gas, the liquid in the tank boils to replace it, and the boiling of the liquid takes heat (latent heat of vaporization) so the liquid and the tank cool as gas is ...



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