looking for advice on what best back up heater to use in my 90 defender hardtop such as 12 volt or ones that you can hard wire into battery.

now living stockholm sweden

So I take it spindle shaft can’t be replaced? Need replacement unit. Thanks for reply

Can anyone tell me if the element spindle shaft is replaceable as mine has sheared at base of bowl. Hoping to remove stump with an easy out, or does whole unit need replacing. Thanks