I think will I have to drop it, because there is a TMV that I have on its max setting, that appears to be around 48C, and I have no way to get upstream of that. I thought about plumbing the laundry sink direct to the hot from the plate exchanger, since sometimes very hot water is useful, but from what I have read it is not legal to have any hot taps that are not protected by the TMV. So do any calcs, I was thinking I would need to get the temps low enough that the TMV doesn't interfere.