Very low hot water pressure or flow from Gledhill mains‑pressure cylinder

Safety: Isolate water supply before dismantling any valves. Be prepared for residual pressure and water discharge.

Steps:

• Check cold mains: Confirm that cold taps have good pressure. If not, the issue is with the incoming supply.
• Inspect isolation valves: Ensure all service valves on the cold inlet and hot outlet are fully open.
• Clean strainers: Remove and clean filters on the combination valve and any inline strainers on the hot outlet.
• TMV service: Disassemble the thermostatic mixing valve according to the manufacturer’s instructions, clean out scale and debris, and replace cartridges or seals if worn.

Note: If flow remains poor after these checks, internal pipework or the cylinder coil/plate exchanger may be restricted and require professional attention.