Main
Main Seal Secondary Heat Exchanger 5109977
A secondary heat exchanger seal for Main and Potterton HE boilers, part number 5109977.
At a glance
- Part type: seal
- Also known as 1123686
£13.38
£11.15 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
This is the secondary heat exchanger seal for Main and Potterton HE gas boilers. It seals the joint on the domestic hot water heat exchanger, preventing water loss from the assembly. The part is manufactured under the Main brand and carries the part number 5109977.
Signs this part needs replacing
- Water weeping or dripping from the secondary heat exchanger joint
- Staining, corrosion or scale deposits around the seal face
- The seal feels hard, flattened or brittle when inspected
- Repeated pressure loss on the heating or hot water circuit
- Traces of water inside the boiler casing below the heat exchanger
Before you order
- Confirm your boiler model against the fitment list above
- Check the seal position on the secondary heat exchanger before removal
- Compare the part number 5109977 with the marking on the existing seal
- Inspect the mating faces for scale or corrosion before fitting the new seal
Compliance
| GC number | H26-820 |
|---|---|
| Barcode / EAN | 5039177650591 |
| Alternative numbers | 1123686 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN HEATING ONLY 12 HE | 41-474-02 | 41-474-02 | — | — |
| MAIN MAIN HEATING ONLY 15 HE | 41-474-03 | 41-474-03 | — | — |
| MAIN MAIN HEATING ONLY 18 HE | 41-474-04 | 41-474-04 | — | — |
| MAIN MAIN HEATING ONLY 24 HE | 41-474-05 | 41-474-05 | — | — |
| MAIN MAIN HEATING ONLY 9 HE | 41-474-01 | 41-474-01 | — | — |
| POTTERTON PERFORMA HE 12 SL | 41-592-06 | 41-592-06 | — | — |
| POTTERTON PERFORMA HE 15 SL | 41-592-07 | 41-592-07 | — | — |
| POTTERTON PERFORMA HE 18 SL | 41-592-08 | 41-592-08 | — | — |
| POTTERTON PERFORMA HE 21 SL | 41-592-09 | 41-592-09 | — | — |
| POTTERTON PERFORMA HE 24 SL | 41-592-10 | 41-592-10 | — | — |
Showing 10 of 18 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.
MAIN appliance manual — MAIN HEATING ONLY 12 HE (GC 41-474-02), MAIN HEATING ONLY 15 HE (GC 41-474-03), MAIN HEATING ONLY 18 HE (GC 41-474-04), MAIN HEATING ONLY 24 HE (GC 41-474-05), MAIN HEATING ONLY 9 HE (GC 41-474-01)
manualmanualPOTTERTON appliance manual — PERFORMA HE 12 SL (GC 41-592-06), PERFORMA HE 15 SL (GC 41-592-07), PERFORMA HE 18 SL (GC 41-592-08), PERFORMA HE 21 SL (GC 41-592-09), PERFORMA HE 24 SL (GC 41-592-10), PERFORMA HE 9 SL (GC 41-592-05)
manualmanualPOTTERTON appliance manual — SUPRIMA 30 HE (GC 41-075-35), SUPRIMA 40 HE (GC 41-075-36), SUPRIMA 50 HE (GC 41-075-37), SUPRIMA 60 HE (GC 41-075-38), SUPRIMA 70 HE (GC 41-075-39), SUPRIMA 80 HE (GC 41-075-40)
manualmanualPOTTERTON appliance manual — SUPRIMA 70 L (GC 41-590-46)
manualNo technical questions yet for this part.
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