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Thermotech Radiators

We installed a bunch of these in the 90's, but they seem to have disappeared.  I think they were made in S. America. They look exactly like Buderus Solidoflux.  The issue is that on one job we did, the valve - operated by the Herz TRV head - is frozen in  the closed position and needs to be replaced.  I'd like to source some replacement valves without having to replace the entire radiator.
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
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