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Band-aid for steam + DHW zone?

Today as I was about to go stuff my gut with turkey, and be gone for some 12 hours, the house got really warm. That meant the DHW storage tank was calling for heat but not getting any and the boiler would run forever. 3rd time this has happened in a year. The plumber who piped the Superstor zone into my steam system using boiler water (not the tankless coil) for the zone said it was air-bound and I should bleed the zone. Since he provided no bleeder I can't do that. Besides, it's an open loop using boiler water, it shouldn't get air-bound. The "from boiler" piping (containing the circulator and tapped into the boiler mid-level) for the Superstor is very hot (even past the circ and into the tank) but the "to boiler" (returning to the bottom of the boiler) is stone cold. My theory is that the water is flashing to steam at the circulator suck side. Make sense? Any other causes?

Once I let the system cool so there's no steam pressure, the loop works fine. The water level was above the tapping so it isn't running dry unless the water level isn't level (tapping is on the opposite side from the steam risers).

Is there a cheap & easy fix until I can re-pipe it correctly in the spring? Maybe a controller that limits the system to 180 when the stat in the Superstor calls for heat?

thanks + happy Thanksgiving,


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