My house has the living room, dining room, kitchen, and sunroom served by hydronic baseboard radiators in a series loop. I'm remodeling the kitchen and the plan calls for using all walls for cabinets. I've decided to remove the 5' radiator currently serving the kitchen and install a toe kick radiator under the sink cabinet.
I was expecting the plumber to install one 3/4" x 1/2" monoflo tee and one standard 3/4" x 1/2" tee greater than 12" apart on the 3/4" heating pipe. Instead, he installed two monoflo tees in parallel with the 12' baseboard radiator serving the sunroom. the supply and return pipes for the sunroom radiator run parallel to each other, about 8" apart, through the center of the kitchen. He put one monoflo on each of these pipes in one joist bay.
Should I be worried about this configuration? Is it OK to mix and match series loop with a toe kick heater in parallel with a baseboard radiator? In all the diagrams I see online, either everything is in series or everything is in parallel. E.g., see https://www.houseneeds.com/learning-center/hydronic-radiator-installation/hydronic-radiators-convectors-piping-examples
. In the middle left picture at the link above (series loop), the plumber installed two monoflo tees to serve the toe kick heater across the top right baseboard radiator.
Is this acceptable? Or should I insist on changing the configuration to be as shown in the series loop picture? I haven't installed the toe kick radiator yet. The subfloor is currently open and it's easy to do plumbing and electrical work within joist bays.