My mother lives in a small home I own in a retirement community. Two small bathrooms (both full) and the kitchen (sink only) are located 50 to 60 feet from the water heater, which is located in the garage. I pretty much understand the pros and cons of hot water recirculation systems (gravity and pumped). I also know what's involved in installing a tankless water heater closer to the bathrooms, but that seems like a lot work and expense for faster hot water. Currently, the hot water is fed through a 3/4" line with 1/2" branches near the baths and kitchen. About 10 feet of the 3/4" line is under the garage slab and 40 to 50 feet is in the crawl space under the house. Since a 1/2" line has a little less than half the capacity of a 3/4" line, what are the pros and cons of replacing the 3/4" line in the crawl space with three 1/2" lines, one to each bath and the kitchen. Would this result in water reaching the baths and kitchen twice as fast and waste less water, or would it just save water?
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