AIRTHERMIA RSJ-15/270RDB10N7-L1 vs ELCO NL_AEROTOP DHW 250.3 SYS 3735679
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, ELCO NL_AEROTOP DHW 250.3 SYS 3735679 129 %. The ELCO NL_AEROTOP DHW 250.3 SYS 3735679 is better on 5 of 7 comparable points.
Both models in detail
Who wins where
- AIRTHERMIA RSJ-15/270RDB10N7-L1
- ELCO NL_AEROTOP DHW 250.3 SYS 3735679
Biggest differences
| Fact | RSJ-15/270RDB10N7-L1 | NL_AEROTOP DHW 250.3 SYS 3735679 |
|---|---|---|
| Outdoor sound power | 54 dB(A) | 67 dB(A) |
| Indoor sound power | 51 dB(A) | 55 dB(A) |
| Annual electricity use, warmer climate | 1,167 kWh | 1,132 kWh |
| ηwh, warmer climate | 144 % | 148 % |
Score per area = position (0–100) relative to all 450 models in this category; higher is better.
| Technical specifications | AIRTHERMIARSJ-15/270RDB10N7-L1 | ELCONL_AEROTOP DHW 250.3 SYS 3735679 |
|---|---|---|
| General | ||
| Load profile | XL1 | XL2 |
| Efficiency | ||
| Water heating efficiency ηwh | 128 %1 | 129 %✓2 |
| ηwh, colder climate | 104 %1 | 105 %✓2 |
| ηwh, warmer climate | 144 %1 | 148 %✓2 |
| Energy label | A+1 | A+2 |
| Annual electricity use, colder climate | 1,614 kWh1 | 1,598 kWh✓2 |
| Annual electricity use, warmer climate | 1,167 kWh1 | 1,132 kWh✓2 |
| Noise | ||
| Indoor sound power | 51 dB(A)✓1 | 55 dB(A)2 |
| Outdoor sound power | 54 dB(A)✓1 | 67 dB(A)2 |
Frequently asked questions
Which is better: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ELCO NL_AEROTOP DHW 250.3 SYS 3735679?
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, ELCO NL_AEROTOP DHW 250.3 SYS 3735679 129 %. The ELCO NL_AEROTOP DHW 250.3 SYS 3735679 is better on 5 of 7 comparable points.
What is the water heating efficiency ηwh of the AIRTHERMIA RSJ-15/270RDB10N7-L1 and the ELCO NL_AEROTOP DHW 250.3 SYS 3735679?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 128 %. ELCO NL_AEROTOP DHW 250.3 SYS 3735679: 129 %.
Which is better on outdoor sound power: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ELCO NL_AEROTOP DHW 250.3 SYS 3735679?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 54 dB(A). ELCO NL_AEROTOP DHW 250.3 SYS 3735679: 67 dB(A).
Which is better on indoor sound power: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ELCO NL_AEROTOP DHW 250.3 SYS 3735679?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 51 dB(A). ELCO NL_AEROTOP DHW 250.3 SYS 3735679: 55 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 13 Oct 2026
- European Product Registry for Energy Labelling (EPREL) – water heaters — Europese Commissie · accessed 13 Oct 2026