How to Replace an Ideal Logic Heat Exchanger (UK)
Fit Ideal Logic primary heat exchanger 174485 and plate HEX 173418. Full flush required.
Ideal
Symptoms
Whistling under demand — primary scaled. Weak hot water only — plate HEX blocked.
OEM part numbers
- Primary HEX — 174485.
- Plate HEX — 173418.
- Gasket kit — 173417.
Flush and fit
Powerflush the system first. Fit both HEXs with new gaskets. Refill with fresh Fernox F1 inhibitor (500 mL for a 10-rad system).
Frequently asked questions
- Is the plate HEX cleanable?
- Yes with citric acid at 40 °C for 4 h — but if scale has caused ignition faults, replace.
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