This is on my self build project.
6 loops of 120M each were laid on insulation in 100mm concrete screed.
The manifold was installed & pressure tested before the concrete was laid & held for a long time after.
That was over two years ago & the building has had no heating in all this time.
Just...
I've nearly completed a Barn conversion on a 2 Acre plot.
The ground collector pipes have all been Trenched in deeper than the land drainage on the site & deeper than the septic tank soakaway as well..... My theory on this is you can't freeze running water & winter ground water temperatures will...
I have an underfloor heating system of 720M of 16mm Alpe pipe & only short 2M runs of 28mm pipe to a Ground source heat pump.
Absolute maximum temp rise of 65 degrees more probable 40 degrees.
What size should the expansion vessel be ?