I am considering to improve the efficiency of an existing installation where heat pipes between house and hot water deposit have been insulated with a thin (10mm) neoprene sleeve and directly buried?
I measured the temperature drop between the water tank output and house's heated floor distribution point. With a water flow of nearly 1L per minute, it reads 50C in and 45C out, and I calculated it to be roughly 350 Watts loss per hour.
What would be good and cost saving approaches?
Do a completely new installation enclosed in PVC pipes?
Clean this mess up, cut the pipes, wrap it in new neoprene sleeves?