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Radiator ID

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I thought this was a Buderus radiator, but it's not.

I need to replace the unit because it has stopped heating. Probably something stuck in the TRV, but I can't take it apart to see what's going on.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab