Taco's 5000 Series Heating Only version of mixing valves provides the high performance temperature stability required for today's radiant heating systems. It makes this mixing valve is an ideal choice for a radiant heating system whether in slab, over pours or in joist bay heating installations. Add to that multiple connection types such as straight NPT, union (sweat, threaded, CPVC or Pex) and you have a series of mixing valve that will fit most of your installation needs.