REC
Alpha Pure-RX
Premium HJT panel with 22.3% efficiency and 25-year product warranty.
From £350 per panel installed
How it scores
Scores based on published manufacturer specifications and weighted criteria — not lab testing. Methodology.
Specifications
- Watt peak
- 430
- Weight kg
- 21.5
- Dimensions mm
- 1821x1016x30
- Efficiency %
- 22.3
- Cell technology
- HJT
- Degradation yr1 %
- 2
- Degradation annual %
- 0.25
- Warranty years product
- 25
- Warranty years performance
- 25
- Temperature coefficient %
- -0.24
What I noticed
The REC Alpha Pure-RX sits at the top of the efficiency chart in this comparison at 22.3%. It uses HJT (Heterojunction) cell technology, which combines crystalline silicon with thin-film amorphous silicon layers to push efficiency further than standard TOPCon while also delivering the lowest temperature coefficient here at -0.24%/°C. In practical terms, that means it loses less output on hot summer days than most rivals.
The 25-year product warranty — covering the physical panel against defects — is longer than the 10–15 years standard for most panels. The performance warranty guarantees no more than 2% degradation in year one and 0.25% per year after that, leaving around 93% of original output at year 25. Both warranties are backed by REC Group, a Norwegian company with a strong balance sheet.
Who it suits
Homeowners with limited roof space who want to extract maximum output from the area available. If you have a small south-facing roof and want to hit a meaningful generation figure, the efficiency advantage of HJT genuinely matters. Also worth considering if you plan to sell the property — a 25-year warranted panel with a strong brand name is a selling point that a commodity panel isn't.
What I'd watch for
The price premium is real — REC Alpha panels typically cost 25–40% more per panel than equivalent-wattage PERC or standard TOPCon panels. The efficiency advantage only translates to more power if your roof space is actually constrained. On a large unshaded roof where you can fit more panels, the correct response is usually to use more of a cheaper panel rather than fewer of an expensive one. Also check that your installer is REC-certified — the warranty can be voided by improper installation.