Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Hanicks
Basket
Glow-worm Pressure Relief Valve GLOWWORM0020118190

Glow-worm

Glow-worm Pressure Relief Valve GLOWWORM0020118190

At a glance

  • Part type: Pressure relief valve
  • Also known as GLOWWORM0020118190
Manufacturer part no.
0020118190
Showing prices

£31.20

£26.00 ex. VAT · VAT at 20%

In stock
Order within 14h 49m for same-day dispatch
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Glow-worm 0020118190 is a pressure relief valve used in Glow-worm heating appliances. It sits on the pressurised side of the system and opens automatically once the internal pressure reaches its set limit, discharging water through the outlet to protect the boiler, cylinder and connected pipework from over-pressurisation. Because it is a moving, water-facing component, it is a serviceable part that is replaced when it stops sealing correctly or stops responding to changes in system pressure.

Signs this part needs replacing

  • Water weeping or dripping from the discharge pipe while the system is cold and at rest
  • System pressure climbing steadily, or rising when the boiler is not firing
  • The valve failing to reseat after it has opened, leaving a constant trickle at the outlet
  • Scale, sludge or debris visible around the valve outlet, holding the seat open
  • The pressure gauge sitting above the normal cold-fill figure with no other obvious cause

Before you order

  • Check the appliance data badge and confirm the model and GC number match the part you need
  • Compare the number on the existing valve with 0020118190 before removing it
  • Have a suitable sealing washer or gasket to hand in case the existing one is disturbed during removal
  • Isolate the appliance, drain down and depressurise the system before starting work

Not sure which part?

Tell the parts assistant what it's going into — the appliance make and model, or the GC number off the data badge — and it will check this part is on the fit list.