I think that the problem is that 15mm pipe has been used running from the DHW tank - see image below. The setup is a standard open-vented system. The tap is new, and all connectors are full bore including isolating valves. It works, but I'd like to increase the pressure to the tap.Stop Cocks Exterior Taps 10% Off ★★★★★ ★★★★★ ( 23 ) Product code: 31424 Flat Faced Male Angled Isolating Valve 15mm x 1/2' £3.49 was £3.88

We also stock double check valves, garden tap kits, isolating valves, safety valves and service valves alongside many others. I think that the problem is that 15mm pipe has been used running from the DHW tank - see image below.Replacement BATH ceramic disc cartridges taps valves 20 24 quarter turn 3/4' £9.99 to £28.47 Free postage 3/4'' CERAMIC DISC CARTRIDGES / TAP CARTRIDGES REPAIRS / TAP HEAD FIXING SCREWS £3.40 to £18.99 Free postage 2PCS Kitchen Ceramic Tap Cartridge Valve Disc Insert £4.20 Free postage Only 1 left.Reliance Valves 312 Compact Pressure Relief Valve Female 1.5-6.0 3/4' x 3/4' (555TY) Brass £37.99 Inc Vat Click & Collect Delivery compare Reliance Valves 312 Compact Pressure Relief Valve Male 1.5-6.0 3/4' x 3/4' (363TY) Brass £42.99 Inc Vat Click & CollectWithin our extensive valve range, we supply gate valves and lockshield gate valves.

It works, but I'd like to increase the pressure to the tap.

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