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Using the indirect loop as a high temp secondary loop
I'm installing a Triangle Tube Solo 110. It's heating a radiant thin-slab and a dozen radiators. There is no indirect tank. I'm building a primary loop with four secondary loops. One secondary loop is for the high temp radiators. One secondary loop is an injection loop going to the radiant floor system loop. Another secondary loop is the low temp input from the mod-con boiler. I'm making the fourth secondary loop a high temp input from the indirect tank piping on the boiler. That fourth loop will only come on when the radiators call for heat. This way I still get ultra efficient output at lower temps when there is no need for radiator heat. Is there going to be any problem with this? I understand the boiler operates a little differently when it goes into a domestic hot water call for heat, but I don't see how that will hurt anything.
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