ASHP - flow/return

[Kelvin]

The only thing dearer is the duo insulated pipe and the stuff I got wasn’t too bad. It’s not much more work going under the slab. It does need to go quite deep due to the bend radius of the pipe though. My only options were under the slab or up the wall and through the ceiling. I opted for under the slab as the ceiling at that location was already very busy with water pipes, electrical/data cables and MVHR ducts. In hindsight I should have moved the plant room to the West elevation where the ASHP was which would have made my plant room a bit more square and made all the MVHR ducting easier to route.