Alpha
Alpha Gas Valve Honeywell VK4105M5009 1.015803
At a glance
- Part type: Gas Valve
- Also known as 1250144
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
£224.05
£186.71 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 Alpha 1.015803 is a gas valve assembly manufactured by Alpha for use in their boiler range. It is a Honeywell VK4105M5009 type valve, responsible for regulating the flow of gas to the burner. This component is found in a wide selection of Alpha combi and system boilers, including the CB50, CB50 LPG, C23, and C23 LPG. The valve opens and closes to supply gas to the burner when there is a demand for heat, and it is a critical safety component in the boiler.
Signs this part needs replacing
- Boiler fails to ignite or repeatedly locks out.
- Intermittent or no heating/hot water.
- Flame appears weak or unstable.
- Error codes related to gas supply or ignition.
- Clicking sounds from the valve without burner firing.
Before you order
- Check the GC number on your appliance matches one listed in the compatibility table.
- Confirm the part number 1.015803 or alternative numbers 1250144 / 015803.
- Check if a new gasket or seal is required for your specific boiler model.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | Gas Valves & Solenoids |
|---|
Compliance
| Manufacturer part number (MPN) | 1.015803 |
|---|---|
| GC number | E57-665 |
| Commodity code | 8481 80 40 90 |
| GPC classification | Valves/Fittings - Water and Gas |
| Alternative numbers | 1250144 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA ALPHA C23 | — | — | — | |
| ALPHA ALPHA C27 | — | — | — | |
| ALPHA ALPHA CB24 | — | — | — | |
| ALPHA ALPHA CB24X | — | — | — | |
| ALPHA ALPHA CB28 | — | — | — | |
| ALPHA ALPHA CB28X | — | — | — | |
| ALPHA ALPHA CB50 | — | — | — | |
| ALPHA ALPHA HE CB25 | — | — | — | |
| ALPHA ALPHA HE CB33 | — | — | — | |
| ALPHA ALPHA HE SY25 | — | — | — |
Showing 10 of 37 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.
ALPHA appliance manual — C23 (GC 47-532-22), C23 (LPG), C27 (GC 47-532-23), C27 (LPG)
manualmanualALPHA appliance manual — CB24 (GC 47-532-15), CB24 (LPG), CB24X (GC 47-532-14), CB24X (LPG), CB28 (GC 47-532-16), CB28 (LPG), CB28X (GC 47-532-17), CB28X (LPG)
manualmanualALPHA appliance manual — CB50 (GC 47-532-18), CB50 (LPG)
manualmanualALPHA appliance manual — HE CB25 (GC 47-532-25), HE CB25 (LPG) (GC 47-532-27), HE CB33 (GC 47-532-26), HE CB33 (LPG) (GC 47-532-44), HE SY25 (GC 41-532-07), HE SY25 (LPG) (GC 41-532-12)
manualmanualALPHA appliance manual — HE25 (GC 47-532-41), HE25 (LPG) (GC 47-532-42), HE33 (GC 47-532-43), HE33 (LPG) (GC 47-532-44)
manualmanualALPHA appliance manual — SY24 (GC 41-532-01), SY24 (LPG)
manualNo technical questions yet for this part.
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