Sting wrote:I know -- I know -- Its him again
but the only correct answer to your [ONE] question is " It depends"
Do you have the contraption set to limit scald or limit cold
if one yes -- if two NO
or is that backwards are you piped to limit heat or pass heat or limit cold or pass cold
or will we pass home and collect $200.00 dollars
let me get back to you on that
..concerning your on demand ..or tankless water heater...what is the reason it CANNOT have incoming water over 100 degrees..??
Im under the impression that it simply wont fire...or "turn on"..
Which if that is the case than allow 120 degree water to it through the anti scald ( mixing ) valve.
On days the there is plenty of hot ( stored) water...your tankless would never fire.
Obviously..on days u are not heating..and ( stored) hot water is cooler...incoming water to your tankless will at least be somewhat tempered....either way-
The valve u mentioned earlier should work fine...
And if i am off base on the reason your tankless heater can not handle "hot" incoming water...kindly disregard...
..good luck with this project