Panasonic Aquarea J Series / L Series
The established Japanese heat pump series: the proven J Series (R32) is still widely installed in the UK, while the newer L and M generations run on R290 propane.
4.2 / 5
★★★★★ ★★★★★ Highly recommended
Strengths
- J Series R290 propane refrigerant - lowest GWP among major UK brands (3 vs 675 for R32)
- 75°C flow temperature on J Series enables existing-radiator retrofits without upgrade
- Strong SCOP at low flow temperatures (5.0 on the 9 kW J Series)
Watch outs
- J Series price premium vs L Series can be £600-1,000
- Standard 5-year warranty is shorter than Vaillant's 7 unconditional
- Documentation and installer app interface reported as less polished than Daikin Onecta
- Range 3-16 kW (J Series + L Series)
- Refrigerant R290 (propane) on J Series; R32 on L Series
- SCOP at 35°C flow Up to 5.0 (J Series 9 kW)
- SCOP at 55°C flow 3.3 (J Series 9 kW)
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Research-based verdict Analysis is research-based - compiled from manufacturer specs, MCS data and installer documentation. We do not own a heat pump; our calculators and data do the work.
- Range
- 3-16 kW (J Series + L Series)
- Refrigerant
- R290 (propane) on J Series; R32 on L Series
- SCOP at 35°C flow
- Up to 5.0 (J Series 9 kW)
- SCOP at 55°C flow
- 3.3 (J Series 9 kW)
- Maximum flow temperature
- 75°C (J Series); 65°C (L Series)
- Operating range
- Down to -28°C ambient
- Sound power
- 50-58 dB(A) by size (J Series quieter than L Series)
- Warranty
- 5 years standard, 7-year extension via certified installer registration
- MCS approval
- Yes - listed under Panasonic UK