just moved in a new house where the bath and toilet has been dow stairs i have a brand new boiler and heating tank pressure down stairs is fine ive just fitted a bath and sink up stairs and managed to tap into the water hot and cold before it goes down stairs ive run in 15mm for basin and 15mm the 22mm for the bath but pipes from the heater tank run in 15mm for around 10ft before i tee into them could this be why or can anyone help can i pump the water or somit