I have a 2 bed semi, 1900s era. The water pressure in the bathroom is pretty poor. I have a separate bath and shower, plus two taps for the sink. The shower isn’t too bad, bath takes a while to fill. I’ve had a problem with the boiler not making the water hot in the bath but it does for the shower. I can have a shower fine and take a long time, but how water for the bath cuts of. I think I’ll need a new boiler as the three heating engineers haven’t been able to solve it. Combo boiler. Any ideas of what I can do?