Vaillant
Vaillant Expansion Relief Valve 0010033570
Vaillant 2.5 bar expansion relief valve, part 0010033570, for Arotherm PLUS /6 heat pumps.
At a glance
- Appliance family: Arotherm PLUS /6
- Also known as 1391478
£84.00
£70.00 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 Vaillant expansion relief valve, part number 0010033570, is a 2.5 bar pressure relief component used in the heating and domestic hot water circuit of Vaillant Arotherm PLUS /6 air source heat pumps. It opens at its set pressure to discharge excess water and protect the system from over-pressurisation. It is a serviceable part intended for replacement when the valve no longer seals or holds its rating.
Signs this part needs replacing
- Water continually weeping or discharging from the relief outlet when system pressure is normal.
- System pressure repeatedly rising above the normal operating range despite correct filling.
- The valve fails to open when pressure exceeds its rated setting.
- Scale, debris or corrosion visible around the valve seat or outlet.
- Pressure gauge readings that fluctuate or drop without any obvious leak elsewhere in the circuit.
Before you order
- Confirm the appliance model and serial number against the manufacturer's parts list.
- Check that the existing valve is marked 2.5 bar, as the rating must match the system design.
- Inspect the valve body and connection for the part number where accessible.
- Verify the fault is the valve itself and not a failed expansion vessel or filling loop.
Compliance
| Alternative numbers | 1391478 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| VAILLANT aroTHERM PLUS /6 VWL 105/6 A 230V S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 105/6 A S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 125/6 A 230V S2 R1 (2022) | — | — | — | |
| VAILLANT aroTHERM PLUS /6 VWL 125/6 A S2 R1 (2022) | — | — | — |
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.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
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