Hi thanks, yeah I think I will just pull the trigger and try it eventually haha
I looked again and the big thing seems to be that under pressure the Davies Craig out performs it by a lot. At ~200hpa it's not a big difference - ~1500lph vs ~1800 lph. 200hpa is 2.9 psi. I have no concept of what sort of resistance is in the system though.
But at 450hpa the Bosch at 500 lph and the Davies Craig is at 1200+ lph. If we are to believe the data sheets and if I converted them correctly! That is 6.5psi.
Even if the system resistance is only 150 hpa, I think it's a ~20+% improvement in flow on paper.
I've got a Type 13, but I've got a fairly large radiator out in front with lots of 90 degree bends....
Bosch cobra
EPB40