On Dec 17, 8:45*pm, (smc22) wrote:
My underfloor radaint heat has worked great for years , all of the sudden
it's
taking a long...........time for my radiant loop of my house to come up to
temp.
Can it be my taco 5000 mixing valve. it is set for 135 and it is
maintaining that
temp no problem . So I have a feeling it's my mixing valve can anyone help
with
the problem.

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Maybe pump is worn out, maybe valve, maybe air in lines, maybe get a
pro its something else.