Aaah Option 2 not safe then.
Is the rise described in Option 1 acceptable? Doesn't say anything about continuous downward run in mf instructions. Boiler's a vaillant ecotec plus.
I've just replaced my old combi which was sited in a hall cupboard, with a condensing one. The problem is that i'm struggling to find a route for the condensate pipe. My choices are:
1. 1.3m drop followed by 10m horizontal then 0.7m rise into kitchen waste pipe
2. reducing condensate to...