Radiant basement floor as “redundant” heat source?
I’m building a ” pretty good house” and as you know, from my other discussions,planning to heat with high performance mini split heat pump or pumps exclusively. With no back up heat I want REDUDANCY. I want to, in the event of a “partial” failure 1. First priority avoid “freeze-up” if it’s unoccupied during a cold snap. 2. maintain a ” livable but reduced IDT, in all or parts of the house. 3 have an efficient system . Other priorities, not associated with “failure” are, not in any particular order are: A happy wife,she says wall units unacceptable, controlled temperature in occupied areas, three temperature zones ( 1 unfinished, therefore unoccupied, basement, 2 bedrooms, 3.daytime living area).
Untill the thread about using a heat pump water heater to lower the cost of operating a radient mass heater I was happily designing around 2 slim ducted systems . That thread caused me to re-think and reevaluate, and consider some other options.! New option 1 add a “hack job” radiant floor, in the basement and call it the back up system (posrsibly eliminates the cost of redundancy it the main floor system and changes the efficiency situation. New option 2 include DHW and go for a GMVS-HS160 WOW! new option 3 use both a “hack job” radiant floor and a GMVS-HS160 as a fail soft pair. Question, How well will a radiant basement floor heat the main floor if it has no other heat, how much “hydronic” heat will I need to install on the main floor? . . .