Hi, I've just moved into a small studio and I've got an old direct combination tank with an immerse heater (RMCylinders) installed. I wondered if there's anything else I can replace it with to get some normal water pressure as there is literally none. Moreover I can't call the water hot, but more like warm-ish, after a whole day of having it turned on. There is no gas in the building, so I guess the alternative should be something electrical. Thank you very much for your help!