How do I get water to go only into tank?
im not sure of your exact question here , im guessing here but are u saying the water wont fill the water heater when supply valve is on , if im right and this is ur question , then try opening a hot water tap somewhere else in house the air that is trapped should be expelled from open tap safely into sink there and heater should fill
be mindfull to not add power/gas till your sure the water heater has filled this would cause failure of your heat supply device
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