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ASTON 300 vs COSMOGAS AGUAMAX 200 R290

Water heating efficiency ηwh: ASTON 300 112 %, COSMOGAS AGUAMAX 200 R290 126 %. The COSMOGAS AGUAMAX 200 R290 is better on 5 of 8 comparable points.

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Who wins where

  • ASTON 300
  • COSMOGAS AGUAMAX 200 R290

Biggest differences

Fact300AGUAMAX 200 R290
Annual electricity use, warmer climate1,397 kWh578 kWh
Annual electricity use (average climate)1,389 kWh833 kWh
Annual electricity use, colder climate1,865 kWh1,254 kWh
ηwh, warmer climate119 %173 %
Water heating efficiency ηwh112 %126 %
Indoor sound power46 dB(A)51 dB(A)
All specifications ↓

Score per area = position (0–100) relative to all 450 models in this category; higher is better.

ASTON300COSMOGASAGUAMAX 200 R290
General
Load profileL1L2
Efficiency
Water heating efficiency ηwh112 %1126 %✓2
ηwh, colder climate98 %✓197 %2
ηwh, warmer climate119 %1173 %✓2
Energy labelA1A+2
Annual electricity use (average climate)1,389 kWh1833 kWh✓2
Annual electricity use, colder climate1,865 kWh11,254 kWh✓2
Annual electricity use, warmer climate1,397 kWh1578 kWh✓2
Noise
Indoor sound power46 dB(A)✓151 dB(A)2
Outdoor sound power46 dB(A)✓151 dB(A)2

Frequently asked questions

Which is better: the ASTON 300 or the COSMOGAS AGUAMAX 200 R290?

Water heating efficiency ηwh: ASTON 300 112 %, COSMOGAS AGUAMAX 200 R290 126 %. The COSMOGAS AGUAMAX 200 R290 is better on 5 of 8 comparable points.

What is the water heating efficiency ηwh of the ASTON 300 and the COSMOGAS AGUAMAX 200 R290?

ASTON 300: 112 %. COSMOGAS AGUAMAX 200 R290: 126 %.

Which is better on annual electricity use, warmer climate: the ASTON 300 or the COSMOGAS AGUAMAX 200 R290?

COSMOGAS AGUAMAX 200 R290: 578 kWh. ASTON 300: 1,397 kWh.

Which is better on annual electricity use (average climate): the ASTON 300 or the COSMOGAS AGUAMAX 200 R290?

COSMOGAS AGUAMAX 200 R290: 833 kWh. ASTON 300: 1,389 kWh.

How we collect and check this data →

Sources

  1. European Product Registry for Energy Labelling (EPREL) – water heaters — Europese Commissie · accessed Oct 13, 2026
  2. European Product Registry for Energy Labelling (EPREL) – water heaters — Europese Commissie · accessed Oct 13, 2026