Ideal
Ideal Safety Valve AH174420
Safety valve for Ideal Alfea+ heat pumps, supplied under part number AH174420.
At a glance
- Also known as 1780156
£19.36
£16.13 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Safety Valve (Alfea+ only) is an Ideal pressure relief component for the Alfea+ heat pump range. It relieves excess system pressure in the heating circuit, protecting the appliance and associated pipework from over-pressurisation. The part is listed by Ideal under part number AH174420, with 174420 as an alternative reference.
Signs this part needs replacing
- Water weeping or discharging from the valve outlet with the system at normal operating pressure
- System pressure repeatedly falling and needing regular top-ups
- Valve failing to seat or hold pressure after the system has been drained and refilled
- Visible scale, corrosion or debris around the valve seat or outlet
- Discharge pipework running continuously when the appliance is up to temperature
Before you order
- Confirm the appliance model against the fit list above before ordering
- Check the existing valve marking or reference so the correct part number is matched
- Verify the system pressure and expansion vessel operation, as a failed vessel can mimic a valve fault
- Confirm whether the appliance is an Alfea+ model, as this valve is listed for that range
Mechanical
| Part type | Gaskets, O-rings, seals and washers |
|---|---|
| Appliance family | Ideal Commercial Imax Xtra |
Compliance
| Manufacturer part number (MPN) | 174420 |
|---|---|
| Alternative numbers | 174420, 174420, 1780156 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL ALFEA EXCELLIA 11KW INDOOR UNIT HEAT PUMP | — | — | — | |
| IDEAL ALFEA EXCELLIA 16KW TRI INDOOR UNT HEAT PUMP | — | — | — | |
| IDEAL ALFEA EXTENSA R32 10KW INDOOR UNIT HEAT PUMP | — | — | — | |
| IDEAL ALFEA EXTENSA R32 5KW INDOOR UNIT HEAT PUMP | — | — | — | |
| IDEAL ALFEA EXTENSA R32 6KW INDOOR UNIT HEAT PUMP | — | — | — | |
| IDEAL COMMERCIAL IDEAL COMMERCIAL PARTS | — | — | — | |
| IDEAL COMMERCIAL IMAX XTRA E120 | — | — | — | |
| IDEAL COMMERCIAL IMAX XTRA E160 | — | — | — | |
| IDEAL COMMERCIAL IMAX XTRA E200 | — | — | — | |
| IDEAL COMMERCIAL IMAX XTRA E240 | — | — | — |
Showing 10 of 26 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
IDEAL COMMERCIAL appliance manual — IMAX XTRA E120, IMAX XTRA E160, IMAX XTRA E200, IMAX XTRA E240, IMAX XTRA E280, IMAX XTRA E80
manualmanualIDEAL COMMERCIAL appliance manual — IMAX XTRA E320, IMAX XTRA E400, IMAX XTRA E480, IMAX XTRA E560
manualmanualIDEAL COMMERCIAL appliance manual — IMAX XTRA F120, IMAX XTRA F160, IMAX XTRA F200, IMAX XTRA F240, IMAX XTRA F280, IMAX XTRA F80
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