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Lochinvar Noble Combi internal piping question

In_New_England
In_New_England Member Posts: 130
The Noble install recommends a secondary loop system for space heating (as I believe a lot of other boilers do). Water from the main heating loop is split (closely spaced tees) and there is a pump in the boiler that draws water into the heat exchanges and then returns it to the main heating loop.

For a domestic heating call, does the same, secondary loop, operate to move heat from the fire tubes to the domestic hot water heat exchanger or is there a second internal loop inside the boiler that we can't access from the outside?

Thank you.

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