We have had a number of enquiries for 25-30 ohm 50 Watt power resistors for electronic door bells recently. The GMR series range of metal clad wire wound resistors offers the GMR-50W 50 watt aluminium housed resistor which suits this application due to its small physical dimensions, solid construction and excellent stability. Data can be found here
We have also introduced a high power range of aluminium housed resistors, the SMRH series. Data can be found here