Saturday 10 January 2015 8.59am
When you refer to centralised heating, I assume you mean district heating that covers the whole building/estate?
Do you have a hot water cylinder and cold water tank or just a cold water tank? I am assuming that there is no such pressure/flow difference At The Kitchen
It is possible that your bath is fed with cold from a tank and with hot from an unvented system. This will create a big pressure mismatch on the hot side. That being the case the obvious solution is to ask the landlord to replumb the system so the bath is fed from the mains. You could also ask them to install something like a wondervalve - www.wondervalve.com - at the bathroom hot tap to reduce the flow (or get it installed yourself). This might mean you need to get a couple of cartridges and test them out and find which one works best at getting the flow down to a manageable level.
It is also possible that there is a valve or suchlike on the bath cold supply that is set very low for some reason. If you have a cold tank see if you can trace the pipe from the tank and find a stopcock on it that is downstream of there the supply to the hot cylinder comes off.