Cpt Sandwich

Thanks Marvin & Bonner! One of the 15mm feeds supplies the following 3 radiators: K2 500x1200 Lounge K1 600x900 Study K1 600x900 Hall and the recommended sizing for the ASHP is: K2 600x1600 Lounge K2 600x1000 Study K2 600x900 Hall The radiators have always been OK when we had Gas Central Heating - but I'd be nearly doubling the size of the radiators with the upgrades! It wouldn't be a massive job to run new feeds if needed. If I did this, I would possibly relocate the Study & Hall radiators anyway. I think the Study one would be better under the window and the Hall one of the opposite wall to where it currently is - but this would then be on the wall at the bottom of the stairs, would this be OK?? Thank you David

Hi, I had an ASHP installed earlier this year, but at the time didn't have the finances to have the recommended oversized radiators installed. I'm now looking at changing some of the radiators in the main rooms for this winter. I've upgraded radiators before, so to run some additional piping should be quite straight forward. All the radiators' downstairs have their feed pipes (15mm) from upstairs and these run down the wall in the corner of each room and then across the bottom of the wall to the radiator. However, some of these 15mm feed pipes serve up to 3 radiators - is this OK, or should each radiator have its own feed pipe from the main flow & return (22mm)?? Thank you David