Have thermal loading units fallen out of favor?

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CountryBoy19

Minister of Fire
Hearth Supporter
Jul 29, 2010
963
Southern IN
Thermal loading units with pump, mixing valve, check valves, all in 1 unit seem hard to find now. Have they fallen out of favor?
 
It's basically the cost of the all-in-one units that is to high.

A simple anti-condense mixing valve with TACO circulator is less than half the cost.