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The other good thing about larger house builds with multiple heating units is that you only need to run one set of pipes carrying cold water all through the house. Each zone can have local plumbing to deliver hot water to the taps closest to the water heater supply. Less pipe costs less money and has lower heat loss over the run. If you have a 4000 sqft house, you are likely to have at least one hot water outlet that is more than 50 feet from the tank hot water heater. Even if you insulate that pipe, you are still going to have heat loss over that kind of run. You will also have a much shorter lag time from when you turn on the hot water tap to when it actually flows hot.
When and if I have the chance, I am installing a tankless system in my house. The house we just bought last year had the tank hot water heater JUST replaced by the previous owner. We thought about going tankless even so, but thought that would be a waste having an almost new tank model already.
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You do not really understand something unless you can explain it to your grandmother.
- Albert Einstein
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