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Radiant t-stats

Zman Member Posts: 7,467
For years this has been my favorite radiant t-stat

You could set the min and max temps and then lock the unit so it could not be changed by the user. They were great for rental properties where people who did not understand radiant would crank up the heat only to get too hot and overheat the room. It had simple PWM to minimize overshoots.

The new one does not have the lockout feature, not only that but it looks like someone could accidentally turn off the heat with 1 button and freeze the house.

Does anyone know of a product with the features of the discontinued model?

"If you can't explain it simply, you don't understand it well enough"
Albert Einstein
Rich_49Dan Foley


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,248
    edited May 2018
    How about the Tekmar 552 You could set it up for Limited, gives user up and down control, but has freeze protection even if turned off at the t'stat.
    It is a 4 wire stat...and then there's the gateway...(if you want/need it).
    Page 11 & page 36 for quick jump to some info.
    Btw, did you call Uponor? Maybe you can buy the last case of them.
  • Zman
    Zman Member Posts: 7,467
    A little more expensive but gets me to the same place...
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,248
    It stinks when something works perfectly for your needs and they discontinue it.
    Any chance you can go with remote sensors and lock up the stats in the basement (also probably more expensive).
  • hot_rod
    hot_rod Member Posts: 19,896
    That tekmar look pretty nice. The earlier versions of the 500 series required a funky backing plate to cover an in-wall box or replace a standard stat. Wiring space was tight also. Looks like they addressed both.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream