Adding Panel Radiator to Baseboard Loop

Not exactly a wood boiler question, but I know someone here will know the answer. Plus I have an EKO 40 in the basement waiting to be installed to hopefully that counts?

I am renovating a small 5x6 bathroom and bought a Runtal panel radiator to save on floor space. Right now the house is two zones, about equal length/size, all tube/fin baseboard. Burnham MPO-IQ84 oil boiler. I would really like to pipe it into the existing baseboard loop if possible. What's the best way to do that? Just plumb it in series? Or maybe put in two closely spaced T's and run it like a secondary loop?

Thanks all. Yes the panel rad takes 1/2 and the rest of the tube/fin is 3/4. Looks like maybe I can use one standard tee and then one monoflo tee on the return as depicted in the first diagram.

Any issues if I add a TRV as well so I can adjust the temp? Based on my understanding the TRV would open/close to allow more/less heat into the room. If it closed all the way, the flow would just stop in the panel radiator loop.

Here is a diagram of the house and existing baseboard runs. Dark red is the baseboard and light red is the piping. I counted up all the baseboard, piping length and elbows to come up with the equivalent length calculations. Can you believe Zone 2 and Zone 3 used to be all one giant loop?!? I split these in two when I replaced my oil boiler a few years back. I did some room heat cals a while back and everything was seriously oversized for the house, enough that I could get away with running like 140-150 water in the dead of winter. I think in 1957 they just stuck baseboard on every available wall surface.




The bath in question is in the top right corner of the diagram. I am doing away with the 5' baseboard in the bath and about 15' worth of piping and the 15 elbows they used to get it up and around joists. The the panel rad will now be the opposite wall, as pictured in the next diagram. It is a small room, only 5x6. I ran some online heat calculators and tried to similarly overize the panel rad (Runtal RTR-2924) so in the future once I get the wood boiler installed I can use lower supply temps, ODR, other cool stuff

This run has about 60' of fin tube radiator on it, and the panel rad is near the beginning of the loop. I have the loop drained now so could switch it up on the boiler side so the panel rad is at the end of the loop instead, if necessary.

I did purchase the Runtal TRV set to go with it, and have a monoflo tee here too I could use if needed. Could I run the panel radiator in parallel with the one section of adjacent baseboard, using regular 3/4x3/4x1/2 Ts? Then if the TRV was open it would permit flow through the panel, or if it was closed, it would all just go through the adjacent baseboard?

Thanks everyone for the helpful replies. I already have the radiator in the garage so too late for electric.

Just remeasured and there is 51' of baseboard on this loop. I plan to plumb the panel in series with the 5' section of baseboard adjacent to it, as depicted in that diagram above.

If I don't use the monoflo tee, will water just bypass the panel rad altogether? Maybe stick a ball valve on the main line to throttle flow if needed?

Any other steps can I take to maximize the chance of success given this plan?