Disregard the last persons answer. You need to run 3 quarter inch gas line directly to the water heater or you could have incomplete combustion which will result in a code if your lucky or you will get co in your house just read the installation book and it will tell the same.
Sure is. You simply need to purchase a to 3/4" to 1/2" Male to female reducer. You didn't mention if your current gas piping is flexible copper, rigid black iron pipe or flexible stainless steel. In any event, get the one that matches your current gas piping. If all of your other gas appliances require an individual regulator, then you'll need one for the tankless water heater. If in doubt, contact your propane provider.
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The water heater needs to have 3 quarter inch gas line directly to the water heater or you could have a restriction in gas flow which could result in incomplete combustion.
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