UK trade guideBoiler Spares 5 min readUpdated 11 July 2026

How to Replace the Pressure Relief Valve on a Ideal Logic Plus 30 (UK)

Step-by-step UK guide to replacing the 3-bar PRV on a Ideal Logic Plus 30. Part numbers, torques, commissioning.

Ideal

The part

Fit a new 3-bar PRV on Ideal Logic Plus 30 when water dribbles constantly from the outside discharge pipe.

Isolate safely

Drain below the PRV, unscrew the old valve and fit new PTFE tape (10 turns clockwise).

Fit and commission

On Ideal Logic Plus 30 the PRV sits on the hydraulic block — torque to 25 Nm to avoid cracking the plastic manifold.

Recommission checklist

Refill the Ideal Logic Plus 30 to 1.2 bar cold. Bleed high-point radiators and the internal AAV.

Run a full flue-gas analysis after 15 minutes. Log the reading against the OEM commissioning envelope in the Benchmark book.

Frequently asked questions

Why does the new one still weep?
Almost always the expansion vessel — check pre-charge first before condemning the PRV.
Any WRAS approval?
Only fit WRAS-approved 3-bar PRVs to keep Ideal Logic Plus 30 within its Gas Safe commissioning envelope.
Do I need to notify the manufacturer?
Only if the Ideal Logic Plus 30 is in warranty — Ideal require log of any part swap for labour claims.
Shop the spares

Browse boiler spares14,820 live parts.

View Boiler Spares