Looking at having an extra bathroom put in. It will be on the 2nd floor/attic. We currently have a sink up there and the water pressure looks good enough both hot and cold in my unqualified opinion. We have a combi boiler. I'm concerned that if someone is using the shower downstairs then it might not be so good.
Would you recommend running it off the combi hot supply or just putting in an electric shower off the cold supply. We'll have a sink so there will be hot water going up anyway.
Is there a "norm" for this type of thing? Anyone got experience?