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Advantage of Outdoor Reset?
Hey gang, I'm trying to finalize the design of my radiant hydronic system. I've had LOTS of help here, particularly on the heat loss and sizing issue. I'm getting very close to buying parts, and need to commit to a design.
To help me understand, is the advantage of modulating boiler output with ODR that it delivers fewer BTUs per unit time when heating needs are less, such that heat delivery over time is close to equal to heat loss over time?
Would the disadvantage of using a constant water temperature across the heating season, say 150' all the time, be that during lower demand times, the emitters get hot and do their job in a shorter time - thus leading to up and down swings in room temp and short boiler cycles (if there is no buffer)?
This whole issue is driven by a new thought about future solar input. Original plan was TT 110 Solo driving both a TT Smart 60 and a separate heating circuit of rads/floor buffered by a Boiler Buddy 30gal.
New thought would be TT 110 Solo heating a TT SME 80, a tank with a 30gal primary volume, a 70gal domestic volume, and a separate coil for solar input. This would necessitate keeping the heating and DHW the same temp.
If my worries above about the constant temp system are valid - would a tempering valve like a Taco i-series attached to ODR downstream of the buffer and upstream of the heating emitters solve the problem?
Alternately, would a DHW tank with a solar coil (like a Heat-Flo or Stiebel-Eltron) in place of the TT Smart 60 in the original plan be a better solution?