Multiple temp system

Dave_4

First of all, I am the builder who, with my partner, will build an "affordable" small vacation/ski home in a market where our competition is putting in very low-end heating packages. I came here looking for advice (subject: "heating a cheap house") and you pros have helped my understanding of heating systems. Many thanks.

We will get our system engineered by one of the pros who frequents this forum, but before we commit with our fee payment, I want to see if I can get further educated.

It seems to me as if there are many ways to hoe this corn, and with the wide variety of views I see here, it is good for me to know what the options are, and the benefits of each.

We have settled on the use of an LP-fired MCB. Our heat loss analysis is pointing to somewhere in the 50 to 60 KBtu/h range. We've two floors, the lower being slab on grade in a walkout basement done with ICF walls, the main floor above being wood framed.

We think now that we want to heat the lower part with in-slab tubing, and the upper part with steel panel rads (Myson T6 IVC) equipped with TRVs.

From what I have been reading and hearing here, the Taco RMB-1 might be the way to handle the RFH part of the package. If so, would the Taco's outdoor reset be utilized to control the boiler? And if so, what controls, other than the TRVs, would best suit the main floor with its Mysons heating the three rooms there?

Edit: I have been studying, and did this little schematic, attached. Am I on the right track?

If I am, are each of the zone valves in the radiant floor part (the low temp part controlled by the RMB) controlled by thermostats?

And, other than the TRVs, is any other type of control needed in the high temp part?