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I am modeling a simple Service Hot Water system with a gas water heater. I have three water use connections attached to the loop: kitchen faucets, bathroom faucets, and showers. When I halve the peak flow rate of each of these, my natural gas consumption for water heating only decreases by 1-2%, rather than the expected 40-50%. Any idea what is going on?

I am modeling a simple Service Hot Water system with a gas water heater. I have three water use connections attached to the loop: kitchen faucets, bathroom faucets, and showers. When I halve the peak flow rate of each of these, my natural gas consumption for water heating only decreases by 1-2%, rather than the expected 40-50%. Any idea what is going on?