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Thank you for your responses. The pipes are very well insulated and tend to be 22 with 15 to the taps. All the pipes are within the heated part of the house. It was 10'c when i tested it the other day. Its a 3 storey house with the HW tank in the basement. It appears that the pipes go to the...

I have a DHW secondary pump running through the house. When it comes on my HW tank drops by 18'c. I know that I should expect a drop but this big? We have a 320 l tank. Is there any other reason than just the pipework being so long that could cause this? thanks