Re Thermsaver 70/90 external boiler. The boiler is working fine on the heating side but the dhw flow/pressure is very poor(approx 40 mins to fill a bath).Can anyone suggest a reason for this .The mains feed to the boiler is 3 bar with a flow rate of approximately 17litres / min which seems more than adequate.This is a soft water area and the boiler is regularly serviced.Any help with this problem would be much appreciated.