It will work, but I wouldn't describe it as good.
You will get the water coming out of the boiler at a maximum of 50deg.
So this will mean 30deg at the brush head
what doesnt work m8 ? probably me being an idiot.
8l boiler, 1 pump , 1 controller?
why would it only come out at 50 degrees?
my fogwash is connected the same way ,> fogwash>1 pump> 1 controller and i can get it boiling hot
does each of your boilers have seperate controllers & pumps