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As rarely sighted as rocking horse poo, a 1.25″BSP immersion heater has a circumference of 131 mm and a diameter of 42mm, thus it is only possible to fit 3 x 8mm U bent elements and 1 stat pockets onto the screwplug, and thus it could be a Single or Three Phase immersion heater, 1-27kW. It is not possible to loop the elements to reduce the watt density, as the resulting element bundle would not fit thru the hole.
If you are unfortunate enuf to be tied to 1.25″BSP, call Jamie on 07897 246 779 to discuss your requirements.

