Hello all, I've been wondering about this for a while now and not really found a definitive answer anywhere. I'm using a backer-style 2.4kw kettle element on my 70 litre boiler, with a self-made silicone washer on the inside, the rubber washer that came with it on the outside, a healthy dosing of ptfe tape and a KM8 nut. It works a treat and doesn't show any sign of leaking, which it does without the silicone washer on the inside, even with a load of ptfe. My question is this; Is the boiler grounded and safe? There's no real metal connection between the stainless pot and the element, is this okay? I always use an RCD plug and correctly rated leads/extensions with the boiler but I'm not entirely sure if that's safety precaution enough. Here are a few pictures of the boiler inside and out. outside and in Look forward to hearing your thoughts (and hopefully not a huge telling off...) Cheers.