Two weeks ago we preemptively replaced every manifold and non-pex connection in our home with pex connections, after three floods. We also asked the plumber to replace all three shower heads and on tub faucet. We have extremely hard water. Have a well, a water softener and a recirculating tankless water heater. Immediately after the work was completed (21 holes in the walls), our water pressure was significantly lower. We can no longer take two showers at once or fill a tub and run the dishwasher as we could before. I would think, with new fixtures and no corrosion (10 year old home) that we would have more pressure not less. Plumber came back today and explains that new fixtures are placing higher flow demand on WH and the tankless is working hard with the temp of the well water to maintain demand. I mean literally our shower was at a dribble while I was filling the tub. We live in Oklahoma. This is our fourth winter with the tankless WH and have never had a decrease in hot water pressure due to cold temperatures before. We’ve had much colder temps than it is right now. I understand what he’s trying to say and he explained the pressure sensor to me on the tankless, but I just feel like we are missing something. It was so sudden, and we have literally created another problem by trying to avoid another one. Also he said really he should have installed a second tankless four years ago for the master and that if we did that we wouldn’t have this problem at all. ♀️ Does anyone have any idea of anything else it could be or anything that We all have could be overlooking?