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Fresh water is either melted ice or desalinated sea water.
the difference between fresh water and potable water is fresh water can come form the ground, and/or, ice burgs.
Mostly North America, with the artic being filled with fresh water and fresh water iceburgs. But, fresh water is scattered throughout the world.
Everywhere that there is fresh water.
By reading the directions that come with each heater as each one is slightly different
beneath the surface
They are in fresh water. Do you think goldfish come from the ocean?
Rain is fresh, and various lakes, rivers, and glaciers contain fresh water (although lakes and rivers are often polluted).
Drain the water from your 1988 Chevy cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. The heater core will come out.
Begin by removing the water supply lines from your Nissan heater core. Remove the heater core retaining bolts. The heater core will come out.
Check that there isn't water around the water heater first, which would mean that turning it off and closing the water valve would be a good idea. Then, check the fuse box to see if the power has tripped--that is if it is an electric water heater.
Installation instructions come with tankless water heater, but would recommend someone experienced enough to install.