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Looking for the expert opinions of you guys. My first floor flat has an Economy 7 setup, with everything on the constant supply except for the one 2.55 kW storage heater and one 3 kW immersion heater, connected to the timed supply via a 2-way CU. I've acquired an additional 1.7 kW storage heater and am about to connect it up with the other timed appliances via a new, larger timed supply CU. So far so good, however the timed CU supply seems to be wired in 6 mm cable! May even be 4 mm but I think this is unlikely? It's about 10 metres from the main meter room. Block built around 1980. Am I within the limits of this supply cable to connect the additional heater? If not, the new heater could go into the constant CU with some sort of timer to switch it on during off-peak times only? What equipment do you recommend to sense the off-peak coming on and energise the new heater if I go down this route?