AIRTHERMIA RSJ-15/270RDB10N7-L1 vs Kermi x-change fresh 300 AI
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, Kermi x-change fresh 300 AI 151 %. The Kermi x-change fresh 300 AI is better on 6 of 7 comparable points.
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Both models in detail
Who wins where
- AIRTHERMIA RSJ-15/270RDB10N7-L1
- Kermi x-change fresh 300 AI
Biggest differences
| Fact | RSJ-15/270RDB10N7-L1 | x-change fresh 300 AI |
|---|---|---|
| ηwh, colder climate | 104 % | 151 % |
| Annual electricity use, colder climate | 1,614 kWh | 1,112 kWh |
| Water heating efficiency ηwh | 128 % | 151 % |
| Indoor sound power | 51 dB(A) | 58 dB(A) |
| Annual electricity use, warmer climate | 1,167 kWh | 1,112 kWh |
| ηwh, warmer climate | 144 % | 151 % |
Score per area = position (0–100) relative to all 450 models in this category; higher is better.
| Technical specifications | AIRTHERMIARSJ-15/270RDB10N7-L1 | Kermix-change fresh 300 AI |
|---|---|---|
| General | ||
| Load profile | XL1 | XL2 |
| Efficiency | ||
| Water heating efficiency ηwh | 128 %1 | 151 %✓2 |
| ηwh, colder climate | 104 %1 | 151 %✓2 |
| ηwh, warmer climate | 144 %1 | 151 %✓2 |
| Energy label | A+1 | A2 |
| Annual electricity use, colder climate | 1,614 kWh1 | 1,112 kWh✓2 |
| Annual electricity use, warmer climate | 1,167 kWh1 | 1,112 kWh✓2 |
| Noise | ||
| Indoor sound power | 51 dB(A)✓1 | 58 dB(A)2 |
| Outdoor sound power | 54 dB(A)1 | 53 dB(A)✓2 |
Frequently asked questions
Which is better: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Kermi x-change fresh 300 AI?
Water heating efficiency ηwh: AIRTHERMIA RSJ-15/270RDB10N7-L1 128 %, Kermi x-change fresh 300 AI 151 %. The Kermi x-change fresh 300 AI is better on 6 of 7 comparable points.
What is the water heating efficiency ηwh of the AIRTHERMIA RSJ-15/270RDB10N7-L1 and the Kermi x-change fresh 300 AI?
AIRTHERMIA RSJ-15/270RDB10N7-L1: 128 %. Kermi x-change fresh 300 AI: 151 %.
Which is better on ηwh, colder climate: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Kermi x-change fresh 300 AI?
Kermi x-change fresh 300 AI: 151 %. AIRTHERMIA RSJ-15/270RDB10N7-L1: 104 %.
Which is better on annual electricity use, colder climate: the AIRTHERMIA RSJ-15/270RDB10N7-L1 or the Kermi x-change fresh 300 AI?
Kermi x-change fresh 300 AI: 1,112 kWh. AIRTHERMIA RSJ-15/270RDB10N7-L1: 1,614 kWh.
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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