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I have 1/2″ pipes from the water meter throughout the house with two full baths. Every fixture installed is fed by 1/2″ line and doesn’t have pressure problems.

Soon I will need to replace my hot water tank and would like to go tankless. Every tankless NG water heater I’ve researched above 4.5 gpm has 3/4″ water line connects. My zone needs are a top rise of at least 70 degrees which puts me in around 9gpm.

Can I reduce those 3/4″ line connects to 1/2″ inlet and outlet and still run that tankless safely and with no loss of performance?