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Tru,
We have had them in the past in three different homes. They are great. You turn on the hot water anywhere in the house and you get hot water right then, no waiting.
Yep, all on timers. The temp is set at the water heater itself as you normally would.
Yes, they run most all the time, they do stop when the timer is set for them to be off. However, if you set the timer say ten minutes before you normally get up in the morning you have hot water at the faucets.
You have to remember the pumps are really small and will use very little energy. There is no resistance in the system. It flows freely around in loops back to the water heater.
These systems are sometimes very difficult to retrofit into existing homes unless you have a crawlspace under the house, or some other means to access every faucet you want in the system. There has to be a supply line and a return line in one big loop from one faucet to another all over the house in one big loop system. I have retrofitted many homes in the past. It is a job but it can be done to work right.
This system is one of the best systems we enjoyed as far as adding things to the house we built for ourselves. Sure there are other things but this one is very nice.
Another very easy add is an "insta hot". Which is a instant hot water faucet that you mount in the kitchen sink in an extra hole in the sink. Turn it on and you have instant hot water 190* great for soups, and coffee, hot chocolate ETC...
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