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Unfortunately, he certainly insists, and has even offered to install our new boiler when he leaves British Gas in April! I just want to check independently that a replacement flow restrictor is still available before contacting British Gas as I do not want to be fobbed off with the "no parts...

Thanks to all, and I will check flow restrictor.

If it helps, flow rate 3.6 litres per minute and if I increase pressure (Bar) from the usual 1 to 1.50 or 1.75, there is no increase in flow rate. If I increase the HW thermostat the display numbers rise. Thank you.

Forgot to mention boiler pressure holds steady, and I have used the filling loop to slightly increase pressure, but this did not result in an increase in hot water pressure.

Domestic hot water temperature is fine (so are the radiators), just experiencing lower than normal hot water pressure. Just feeling frustrated it could be a simple solutions.

Apologies, should of mentioned it is a combi boiler.

Basic boiler that has always proved reliable until last week when a noticeable drop in domestic hot water was noticed. No worry, I have a British Gas service contract, and the next day the engineer without removing his jacket or opening tool box, diagnosed a blocked heat exchanger and left. Came...