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Best control strategy for mid-1950s radiant system?

Steamhead Member Posts: 16,472
Looked at this the other day- we hardly ever run into radiant. The original portion of the house is what looks like 1/4" or 3/8" Bundy pipe in the ceilings. There are a couple newer addition zones using PEX in the floor.

The boiler is the original National gas unit, with no return water temperature protection whatsoever. It looks to be in fine shape and the combustion test was spot-on. Based on its condition, the owner doesn't want to replace it.

The current control system is just standard room thermostats. No outdoor-reset of any type. High limit on the boiler is set to 140 degrees.

The system seems to be running OK, but I know we can do better. ODR would be a minimum, and what about mixing and circulation strategies?

I'm a bit out of my depth on this one, so thanks in advance for any help.
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Towson, MD, USA
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