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Tankless water heater proper pipe size?

5K views 5 replies 6 participants last post by  LawnGuyLandSparky 
#1 ·
Hi all,

My tankless water heater has 1/2" gas and water lines going into it. A plumber tells me that this type of heaters should have 3/4" lines for water and gas. Is this true?. Will it make a big difference for the water heater to go from 1/2" to 3/4" specially with the gas line?
 
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