My son with some learning difficulties lives in a 3rd floor flat which has a very slow running hot tap. In order to get enough water hot enough to wash up he has to leave the tap running for five minutes at a time. We own the flat and had a number of plumbers and it isnt the washer and apparently there is nothing manageable which can be done to improve the flow as it is a water pressure problem, but I am wondering if there is a device to put on the tap to make it cut off after 5 minutes as my son does forget the tap is on and at one point he went out and it caused a flood and damage to flat below? Can anyone suggest anything which could be done to the hot tap to make it stop flowing after about five minutes?