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I have never used a balancer on any small residential system. I find that with a circulator zone system, it is self balancing via the thermostat. if a zone is cold, that thermostat will stay on while the other zone thermostat is satisfied. If you are trying to balance individual radiators on a particular one pipe main, that is usually done with a damper in the radiator cabinet. If you are trying to get the two radiator branch to balance with the other radiators, try doing the individual radiator thing. and when using PEX for those branch runs, try using the next size larger PEX. Use 3/4" for the 1/2" pipes, and use 1" to replace 3/4" pipes.

They uses 2 circulators to avoid having to balance the system. If there were only one circulator, because it is a center fed split main system, they would need balancing valves to make sure both halves of the loop had enough flow to make the monflo work. with 2 circulators, each circulator creates enough flow in each half of the loop.

Someone had the split loop design with one circulator and no balancing valves and couldn't understand why part of the loop didn't heat well.

@Donniejr

You can certainly do the job with hydronic hot water heat. You will need 2 circulators an expansion tank, air eliminators a heat exchanger, glycol and all the piping and wiring and controls.

For me the cost of the above would be prohibitive just to heat a bathroom.

I agree with @jumper above. Some electric baseboards or a wall mounted electric heater with a fan will keep the bathroom toasty

JMHO