We had installed a 3/4 hot water supply line to the far end of the house and 1/2" return to the cold water supply at the hot water tank. The little trick was the check valve at the far end on the 1/2" return line to the HWT. Being the HWT was on the lower floor the gravity would circulate the hot water to the end keeping it hot there for showers etc. The check valve must be one with a light weight nylon ball with no spring so just the force of the hotter water would lift the ball and circulate the cooler water to the HWT. Both tubes should be insulated to save energy and it worked well.
Randen
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