Hi I hope someone will have an answer to this.

Currently we have an old boiler in the house which we have to turn on and off manually.

When the Boiler is turned on it heats the water and radiators at the same time not separately.

However we also has a cylinder upstairs which stores the hot water with a 3000W/240v immersion heater just to heat up the water on electrics. So in effect wont heat the house at the same time.

My plan was to plug in the Tapo P110 between the immersion heater and Switched Spur Plug by adding a Wall plug socket. and then adding a plug to the immersion heater which will go into the P110 so I can turn it on and off witha timer.

Now the specs on the box show 2990W 13/A (UK Version)

Would it be safe to do what I am doing. the supply would be 10W Higher through what is rated on the Tapo P110. 

Just worried it would overheat and melt and then I'd have a new problem