This heater has had problems from day one ! first fitted 3 years ago, would not fire up & when it did would not maintain heat, so as under warranty Worcester get called out, 1st guy cant understand why it wont work then a 2nd chap turns up, start replacing parts, works for a couple of days so 2 more Worcester men on site, cant get it working correctly , so replace complete heater, works but not has it should, Now its stopped again, leaking water valve, replace valve heater will not work ! unless water on full bore, but will not put gas onto full rate , so water not hot, spend 9o mins on phone with 4 different Tec guys after doing every conceivable test they cant understand why it will not work, Simple answer is , it's a load of crap and has been since fitted, can anyone throw any light on to this basic heater ???