Hydronic Forced Air Unit Sizing

Search results turned up nothing so I figured I would start a thread. I found a deal on a Hyrdonic Forced Air Unit but the problem is it is way bigger than I need.

Specs state 220,000 BTU's hr at 200° Water with other ambient environment conditions.

Clearly overkill for my shop that has a heat loss of 60,000 BTU/hr.

Can I still use it successfully to heat although I understand if I ran it full bore - it would have to make sure my mixing is set right on the return line on the boiler.

I'm hoping I can use it for the balance of the season then use it next year in my 40X60 Addition.

I want to heat my shop with it.. I found a great deal on a unit that has 220,000 BTU output but it is way oversize for the current size but would be good for future shop. I want to check to make sure I'm not running into other issues I'm not aware of if I use it now.

Unit heater. Propeller fan mounted behind a coil.