Check the capacity of the heating unit at a given temperature rise. The
figure is fairly low. We do not install them for potable water unless they
are aware of the limitations of them, or are willing to install the proper
The GPM is also rated at a maximum inlet temp. Also a consideration one has
to take into account.
I suspect your water heater is too small for your house. I would have the
plumber who designed and installed it replace it with the properly sized
unit. There is nothing wrong with the water heater.
Another way of operation is to add a storage unit, with a recirc line. In
that scenario you would pretty much have unlimited hot water. With out
much increase in fuel costs
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