Andrews
Andrews Expansion Vessel 50L C789
50-litre, 3.5 bar expansion vessel for Andrews Supaflo EVO water heaters.
At a glance
- Also known as 1821123
£258.58
£215.48 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 Andrews C789 is a 50-litre expansion vessel rated at 3.5 bar, manufactured by Andrews Water Heaters for use with Supaflo EVO water heaters. It absorbs the expansion of heated water within a closed system, helping to maintain stable system pressure and protect components from excess stress.
Signs this part needs replacing
- System pressure rises quickly when the heater is running.
- Water discharges from the pressure relief valve during heating cycles.
- Frequent topping up of system pressure is required.
- Visible corrosion, water staining, or damp patches around the vessel.
- The vessel feels heavy or waterlogged when tapped.
Before you order
- Confirm your appliance model against the fit list above.
- Check that the 50-litre capacity and 3.5 bar pressure rating suit your system.
- Consult the manufacturer's instructions for your specific appliance before ordering.
Compliance
| Alternative numbers | 1821123 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ANDREWS WATER HEATERS ANDREWS HOT WATER SPARES | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF61 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF62 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF63 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF64 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF65 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF66 | — | — | — | |
| ANDREWS WATER HEATERS SUPAFLO EVO SF67 | — | — | — |
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.
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