Immersion heater thread size?

[Heliotrope Smith]

2 1/4" bsp is what you are looking for.

[Kaz]

Does anyone know the standard thread size for domestic immersion heaters in the UK. I guess it is probably a bsp thread but I don't know what size. Thanks

[Kaz]

Thanks, most grateful for the info. Kaz

[Kaz]

BTW does anyone know if steel or black iron backnuts or sockets are available in this size (2 1/4" bsp)? Thanks again

[cj]

Hi Kaz Most plumbers merchants stock a brass immersion heater boss ,if this is what you mean. If however you want a 2 1/4 lock nut then a steel merchant would be better.

HTH

CJ