A whole house unit is less efficient than individual "location" units... thats because you have to run all the cold water out to the faucet... just like my system ,and a old style HWH for that matter. You dont have to store hot water with your system so it saves you money over an old style HWH. My system uses a coil from the boiler to heat the water in the heavily insulated stainless tank so the water thats stored stays hot longer with less effort than an old style HWH.
A location unit give "instant" hot water. In new construction,with the proper planning and budget,its the best thing. Thats all I was sayin.....
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