Advice on How to get lines into and out of house

Good Morning. I have recently decided to move a Woodmaster 4400 that I own to my house. I have been reading with great interests the posts about not skimping on the supply and return line installation process. My question is how to deal with my situation. The Boiler will be sitting on a concrete slab about 25 ft from the basement door to my house. I can dig a 4 ft trench outside and use the closed cell foam to insulate pex. Once inside, the first room of the house (was the coal room years ago) has a dirt floor and is about 20 feet long. This will be tough to dig a trench in. The next two rooms taking me to the forced air furnace where the heat exchanger will be installed have very thick concrete floors, Also the two walls that I will have to go through are concrete (1 is about 10" thick, and the other about 6" thick.) Even with a core drill the largest hole I will be able to get is about 4" Any suggestions on how to minimize heat loss? Thanks for any and all suggestions.
PS I also have a secondary pump for heating my pool. I was thinking of taking that through the house as well, because that helps me avoid the septic system...but boy will it make more length and work.
John

Thanks for the info all. I will transition to insulated and above ground once inside. I rented a core drill for another job about a month ago to put some plumbing through that same wall (I know what incredible foresight) for another job and will have to again but the largest bit they had was 4".