Here are a couple files for your enjoyment. One gives the sq ft of radiation for various cast iron rad types and the other gives an overview of the stelrad line.
The cast iron one allows you to use a formula to determine the output at various water temps. The Stelrad has them at 110 to 180F but there are multipliers for reducing the temps even farther.
Forget using the desuperheater to try to heat rads. They are small HXs designed for a small amount of flow and perhaps 2F temp drop. You need to work within the limits of the HP which means try to keep below 105F (40C) and this is not hard to do.
The HPs I am installing have an outdoor reset so they only heat the buffer tank to the temp needed and shut off entirely when it gets to 18C outside. There is no need for a mixing valve. An outdoor reset control can be added to any HP anyway and measures the tank temp.
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