The immersion heater element in my hot water cylinder has failed. The problem is what length of element shall I get? I can already hear someone saying, 'why don't you take it out first and have a look?' Well that makes perfect sense, of course, but I need to travel a few miles to get a box spanner to get it out first. When I go to get the spanner it would be much easier - and quicker - to get the element at the same time.
The cylinder is about 15 years old and of the indirect type - although not used in mode. It is 36 inches high and the element is fitted at the top. I see two different lengths available at my supplier: 11 inches and 27 inches. Which is it likely to be, or is there no way of being certain?
Thanks for any help.