AIRTHERMIA RSJ-15/270RDB10N7-L1 vs ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 144 %. The ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 is better on 6 of 7 comparable points.
Both models in detail
Who wins where
- AIRTHERMIA RSJ-15/270RDB10N7-L1
- ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074
Biggest differences
| Fact | RSJ-15/270RDB10N7-L1 | ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 |
|---|---|---|
| Annual electricity use, warmer climate | 1,167 kWh | 1,009 kWh |
| ηwh, warmer climate | 144 % | 166 % |
| Water heating efficiency ηwh | 128 % | 144 % |
| Annual electricity use, colder climate | 1,614 kWh | 1,443 kWh |
| ηwh, colder climate | 104 % | 116 % |
| Indoor sound power | 51 dB(A) | 48 dB(A) |
Score per area = position (0–100) relative to all 450 models in this category; higher is better.
| Technical specifications | AIRTHERMIARSJ-15/270RDB10N7-L1 | ATAGENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 |
|---|---|---|
| General | ||
| Load profile | XL1 | XL2 |
| Efficiency | ||
| Water heating efficiency ηwh | 128 %1 | 144 %✓2 |
| ηwh, colder climate | 104 %1 | 116 %✓2 |
| ηwh, warmer climate | 144 %1 | 166 %✓2 |
| Energy label | A+1 | A+2 |
| Annual electricity use, colder climate | 1,614 kWh1 | 1,443 kWh✓2 |
| Annual electricity use, warmer climate | 1,167 kWh1 | 1,009 kWh✓2 |
| Noise | ||
| Indoor sound power | 51 dB(A)1 | 48 dB(A)✓2 |
| Outdoor sound power | 54 dB(A)✓1 | 57 dB(A)2 |
Frequently asked questions
Which is better: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074?
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 144 %. The ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074 is better on 6 of 7 comparable points.
What is the water heating efficiency ηwh of the AIRTHERMIA RSJ-15/270RDB10N7-L1 and the ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 128 %. ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074: 144 %.
Which is better on annual electricity use, warmer climate: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074?
ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074: 1,009 kWh. AIRTHERMIA RSJ-15/270RDB10N7-L1: 1,167 kWh.
Which is better on ηwh, warmer climate: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074?
ATAG ENERGION NUOS PLUS S2 WI-FI 250 FS 4057074: 166 %. AIRTHERMIA RSJ-15/270RDB10N7-L1: 144 %.
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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