AIRTHERMIA RSJ-15/270RDB10N7-L1 vs Hitachi RAM-Y85N5HAE + TAW-270RHD
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, Hitachi RAM-Y85N5HAE + TAW-270RHD 119 %. The AIRTHERMIA RSJ-15/270RDB10N7-L1 is better on 7 of 7 comparable points.
Both models in detail
Who wins where
- AIRTHERMIA RSJ-15/270RDB10N7-L1
- Hitachi RAM-Y85N5HAE + TAW-270RHD
Biggest differences
| Fact | RSJ-15/270RDB10N7-L1 | RAM-Y85N5HAE + TAW-270RHD |
|---|---|---|
| Indoor sound power | 51 dB(A) | 65 dB(A) |
| Outdoor sound power | 54 dB(A) | 65 dB(A) |
| ηwh, warmer climate | 144 % | 130 % |
| Annual electricity use, warmer climate | 1,167 kWh | 1,287 kWh |
| Water heating efficiency ηwh | 128 % | 119 % |
Score per area = position (0–100) relative to all 450 models in this category; higher is better.
| Technical specifications | AIRTHERMIARSJ-15/270RDB10N7-L1 | HitachiRAM-Y85N5HAE + TAW-270RHD |
|---|---|---|
| General | ||
| Load profile | XL1 | XL2 |
| Efficiency | ||
| Water heating efficiency ηwh | 128 %✓1 | 119 %2 |
| ηwh, colder climate | 104 %✓1 | 103 %2 |
| ηwh, warmer climate | 144 %✓1 | 130 %2 |
| Energy label | A+1 | A2 |
| Annual electricity use, colder climate | 1,614 kWh✓1 | 1,630 kWh2 |
| Annual electricity use, warmer climate | 1,167 kWh✓1 | 1,287 kWh2 |
| Noise | ||
| Indoor sound power | 51 dB(A)✓1 | 65 dB(A)2 |
| Outdoor sound power | 54 dB(A)✓1 | 65 dB(A)2 |
Frequently asked questions
Which is better: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Hitachi RAM-Y85N5HAE + TAW-270RHD?
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, Hitachi RAM-Y85N5HAE + TAW-270RHD 119 %. The AIRTHERMIA RSJ-15/270RDB10N7-L1 is better on 7 of 7 comparable points.
What is the water heating efficiency ηwh of the AIRTHERMIA RSJ-15/270RDB10N7-L1 and the Hitachi RAM-Y85N5HAE + TAW-270RHD?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 128 %. Hitachi RAM-Y85N5HAE + TAW-270RHD: 119 %.
Which is better on indoor sound power: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Hitachi RAM-Y85N5HAE + TAW-270RHD?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 51 dB(A). Hitachi RAM-Y85N5HAE + TAW-270RHD: 65 dB(A).
Which is better on outdoor sound power: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Hitachi RAM-Y85N5HAE + TAW-270RHD?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 54 dB(A). Hitachi RAM-Y85N5HAE + TAW-270RHD: 65 dB(A).
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How we collect and check this data →
Sources
- European Product Registry for Energy Labelling (EPREL) – water heaters — Europese Commissie · accessed Oct 13, 2026
- European Product Registry for Energy Labelling (EPREL) – water heaters — Europese Commissie · accessed Oct 13, 2026