I've just replaced an old copper hot water cylinder with an unvented system made by UV Gold. The old one was small and only had one immersion heater; the newer one is larger and has two - one near the base and one higher up. This is our only source of hot water. The exisiting supply is 2.5mm T&E so the installer only connected the lower of the immersers. Most of the time this will be fine but when we have visitors I'd like to be able to run both at the same time for rapid reheating of the water after showers etc. I was planning to replace the supply cable with 4mm leading to two fused spurs but was wondering what is the best arrangement. Should I use a junction box to connect the two spurs to the supply cable or run a cable from the first spur box to the second ?
Thanks
John
Thanks
John