£800?!? Chuffing Norah I hope it’s nowhere near that! I just can’t seem to make any sense of the system, I can get all of the rads warm, to about 40°, but the only one that gets mega hot is the first one in the bathroom, and when I get the others warm in one room it’s at the cost of another rad in a different room going cold.
What exactly is the purpose of checking the different temperatures of the flow and return to the boiler? Is it to see whether the boiler is shutting off before it’s managed to allow enough time to pass to send hot water to all the rads? If that’s the case would that show that the returns are opened up too far across the whole system allowing the hot water to return quicker to the boiler than it should do?