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If there's room in the bathrooms (e.g., on the wall, under the sink), you can install the "instant hot water" heaters that are used in much of the rest of the world. They only turn "on" when you turn on the faucet (sometimes they're controlled by an electric switch, either on the unit or on a nearby wall). In other words, they are not heating and re-heating the water when there are temperature fluctuations where the heater is located, although there is no immediate use for hot water. The speed at which they deliver hot water -- and lots of it -- is amazing.
If I could afford it, I would definitely have one of these in each of my two bathrooms. Try doing some internet research. The prices and specifications can vary quite a bit, depending on how you decide to set it up. You might need a plumber and an electrician!
Answered 2 years ago