The rumblings about the "8" comes from early units and some complains because of ground-loops in homes that suddenly shows up because of the introduction of separates and not using XLF connections.
Jakeman has both the -8 and the -2.


E = MC2 = ((2M80 + VP180 + 4QS8)/(EP800 + EP500))^(ADA1500 x D2v)
AxiomAir/6xM2/4xM22/2xVP150/2xM3