We have started to suffer from low hot water pressure from an unvented system.
Having ensured that there is an air gap in the main hot water tank the problem goes away for a short while but then returns. I presume the air gap is not being retained in the hot tank.
Can anybody suggest how I can fix this.
Having ensured that there is an air gap in the main hot water tank the problem goes away for a short while but then returns. I presume the air gap is not being retained in the hot tank.
Can anybody suggest how I can fix this.

