The system I have in my house is a boiler that feeds the heating system, the infloor basement heating, and my hotwater tank is heated by the boiler...
But importantly the boiler water is separate from the hot water... it merely heats the hot water tank through a heat exchanger in the hot water tank.
When my original hot water tank needed to be replaced, the idiot plumber replaced my tank with a storage tank and fed the boiler water into storage tank... not a good situation for sure.
After the headache I went through with that, I wish I would have gotten the tankless hot water system - even at $4K
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