Righto finally took the time today to tidy up the HWS. I had planned to just fix the switch and took the gasworks off to do so. Quite a reluctant switch to get back in, did it though. Took the opportunity to do the anode as well nearing the vans 2nd birthday. The old one was easy enough to get out, though a tip is to do it outside rather then inside the shed
Fortunately it's a rural shed so no damage. The new anode was slightly different then the original, in that it had a different amount of thread and a slightly thicker. I reckon the one in the HWS was the wrong one not the I bought. So anyhow when I inserted the new one it stuck out about 2cm but was very firm. took it out and thought it may be a fraction too long in comparison with the original so I took 1/2 cm off the end with no change in the result. I looked inside at the thread and it matches the anode for length except 1/2 of it was badly corroded because the thread on the old anode was too short, thus I reckon it was wrong. Anyhow I threw some more tape on it and tightened it as much as is reasonable and it's not leaking. I don't have a tap big enough to attempt to fix the thread.
Another tip is to make sure you have a 27mm socket, makes life pretty easy.
Another tip is to make sure you have a 27mm socket, makes life pretty easy.