hi, I got a new boiler installed yesterday and so far not so good. The water pressure is way too low? somehow it has affected it and when i run the tap, it starts off good, but then in a couple of seconds, the tap will have no water coming out. I also tried this for my bathroom when i run the bath, the water seems to stop completely. I also realised that if one tap is turned on, the others won't work. The model of the boiler is a ---Vaillant Ecotec Pro 28--- This was never a problem with my old boiler, and I have no clue what is wrong, can i have some help? May I also mention that the central heating is fine and there is no problem with it.