Hi there , i seem to have a strange problem with the hot water at the moment i live in a 3 bed 2 bathroom house and i am getting hot water in one of the bathrooms but the other one runs cold then hot then cold intermittently also the kitchen sink hot tap also runs hot and cold but the hot tap in the ground floor toilet is fine , i have a megaflo tank and vaillant boiler which seem to be working fine and i just dont know why this is happenig , i have followed the instructions on the side of the megaflo that tells you how to repressure the tank , but this does not clear the problem also i have not had any work done in the house for over a year so that rules out any thoughts of something gone wrong there , can any one shed some light on why this is happening and any possible fix , thanks in advance .