Runtal towel warmer connection

Having read many posts here, I was hoping for some advice on connection my Runtal 4624 towel warmer. It will be the primary heat source (still considering electric radiant for under the tiles) for my bathroom. I'm replacing a roughly equivalent amount of  fin tube with this unit so I think the BTU output should be a fairly close swap after the towels are accounted for.



I want to plumb the unit into the middle of a well-balanced series loop of fin tube baseboard in a bungalow in Victoria BC (very mild climate....perhaps 5-10 days a year below freezing). I'm running a Lochnivar Knight with outdoor reset which typically runs at about 20%.....water temps of 118-123 degrees.



The question is whether I should connect this directly into the series loop like the rest of the baseboard, or will the constriction from 3/4 inch to 1/2 inch be a problem?. Alternatively I could use venturi tees, or use a pair of conventional tees with a bypass and a globe valve in between.



Thanks for the help.