Am I getting Economy 7 rates?

Hello folks

We are on an Economy 7 tariff with 3 storage heaters on the Economy 7 circuit, which we hear click on and off at 12.30am and 07.30am. We have now disconnected the storage heaters but are running various appliances (eg. dishwasher) on delays so that they run overnight. I am just considering putting a timer switch on our immersion heater, as we’ve just had a new, larger, well-insulated tank installed. However I’m wondering whether we actually get Economy 7 off-peak rates on our normal circuit, during off-peak hours, or do we only ever get off-peak rates on appliances connected to our Economy 7 circuit?