water pressure problems in our hospital. We have had hot problems in our 5 year old facility since day one. I have replaced the DHW return circulating pump with a grundfos 3-speed and it seemed to work very well for about the first year. the water looks clean when I drain it but I will lose pressure at my faucets after running for about 5 minutes. I don't know if this is a recirc problem or completely different. Some days I have little pressure at all. Help!