Originally Posted by outdoorbloke
Ended up going with a 2.2 meter one from the local shop as I didn't have a big enough car to get the 3 meter one home from watsadu.
lol it should be fine, but after installation, you can do like SandMike says and check the resistance with an Ohm meter/DVOM if you are really concerned about it.
I had just one regular sized one for the whole house driven by the septic tank and it was just fine. Wired into the consumer unit's earth bar, I used that one earth stake to earth everything and used a single main RCBO.
Promise you thats gonna be better & safer than 99% of most home installations here.
I debated driving one for each hot shower and giving them all their own, but decided its overkill & kinda pointless.