What I’ll probably try to do is install the AtA heat pump first. Then I’ll do the plumbing for the in floor heat and hot water on demand before doing the AtW heat pump. After that i might upgrade my floors to something with better thermal mass. I’m gonna do as much work as i can myself. I’ve only got a 600 sqft floor to heat and I’m just gonna install pipes under floors from the unfinished basement/crawlspace. The I’ll seaI the basement with professionally done spray foam.