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Taco SR501 help

Hello, I have a question about wiring a switching relay for a indirect water heater on a boiler.

Existing oil boiler has a boilermate indirect water heater with a circ pump just for that zone, I am going to be replacing it with a HTP indirect, I believe in order to make this work, I will have to install a SR501 relay, my only question with wiring the relay is, Where is says "TT from boiler", where do I connect the TT to on the boiler? Am I wiring those two lines to the boilers aquastat control? Thank you in advance.