Flue should run uphill so condensate runs back to the boiler. You still get occasional drips from the flue outside but it should never be much more than a few drips now and again.
Cheers
Carl
You should be able to see it but it will be very slight!
Look at it from the side and you should see it. I think from memory it's a 3degree incline minimum.
I would only worry if you are watching regular consistent drips.
Have a look and see if you have a plume deflecor as well.
It should be on the flue at the very end. It should have a screw which can be adjusted so you can twist the deflector to direct the plume in a chosen direction. I have had a case where condensate was getting trapped in this fitting and dripping from that.
Try directing it upwards (if not already)
I would consider getting the installer back in any case!
Carl
If this one has a built in slant then horizontal is ok. Just make sure it's level in this case. 3 degrees isn't a lot and if it's not spot on level maybe it's lost the slope.
I'd check the deflector and make sure it's at least level as stated. I tend to go a little more than spot on level anyway even if it's built in!
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local