If more than one cold tap is opened in our house the cold water pressure/flow drops considerably. This is a problem when someone is using the shower and a cold tap is run or the toilet flushed, as the shower goes scolding hot.
The hot water is fed from a Megaflow.
We have had a couple of plumbers round to assess the problem. Both measured the mains flow and pressure, with one concluding that the pressure wasn't sufficient to have Megaflow fitted and recommended we remove it altogether and replace it with something else, while the other said that the pressure was adequate and increasing the income pipe from 15mm to 22mm would solve the issue.
So I guess my question is what pressure and flow is required for a Megaflow, and will achieving these solve the issue with the cold water?
The hot water is fed from a Megaflow.
We have had a couple of plumbers round to assess the problem. Both measured the mains flow and pressure, with one concluding that the pressure wasn't sufficient to have Megaflow fitted and recommended we remove it altogether and replace it with something else, while the other said that the pressure was adequate and increasing the income pipe from 15mm to 22mm would solve the issue.
So I guess my question is what pressure and flow is required for a Megaflow, and will achieving these solve the issue with the cold water?