My house copper lines are 3/4 in and my new water heater accepts 1/2 copper in a compression connection. Is there any issue with adding a 3/4 to 1/2 reducer before and after the heater?
Just doing the math for the area A = πr2
- 1/2 inch pipe that is A = π(.25)^2
- 3/4 inch pipe that is A = π(.375)^2
You can see the difference in area and that changes the amount of volume that will flow. Your water heater has a flow rate based on its piping and therefore it will be the limiting factor. Your house could handle more.
The only problem I can foresee possibly happening and would be most likely after install is that your 3/4 pipes could have an air gap but this should dissipate over time by running the water slowly in order to fill the line and build pressure.