I have a related question.
If the pump is on, it is sending heated water to the tank, upstairs in my case.
At the same time, it is heating the central heating.
If I wont want it to heat the water tank (I use immersion), would it be be more efficient to turn the pump off permanently?
Ie, I am thinking that more oil will be used to heat the water for the central heating PLUS the water tank. No need for full tank of water to be heated, as it is only for washing up / washing hands etc (have electric shower).
Or am I wrong?