--- title: "AEET vs Viessmann - Brand Comparison | ComparePV" description: "Compare AEET vs Viessmann solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background." source: "https://comparepv.com/aeet-vs-viessmann" --- # AEET vs Viessmann Viessmann has the broader catalog (11 vs 5 models). Viessmann leads on peak efficiency at 21.30%. ## The two companies | Attribute | AEET | Viessmann | | --- | --- | --- | | Country | | Germany | | Headquarters | | Allendorf | | Founded | | 1917 | | Employees | | | | Annual capacity | | | | Tier 1 | no | no | | Listed | | | | Website | | [https://www.viessmann.com](https://www.viessmann.com) | ## Catalog & Power | Measure | AEET | Viessmann | Margin | | --- | --- | --- | --- | | Panel Models | 5 | 11 | +6 | | Max Power | 200 W | 405 W | +205 W | | Avg Power | 190 W | 361 W | +171 W | ## Efficiency | Measure | AEET | Viessmann | Margin | | --- | --- | --- | --- | | Max Efficiency | 15.70% | 21.30% | +5.60 pp | | Avg Efficiency | 14.90% | 19.41% | +4.51 pp | ## Reliability & Warranty | Measure | AEET | Viessmann | Margin | | --- | --- | --- | --- | | Avg Temp Coefficient | - | -0.362%/°C | | | Bifacial Share | 0 (0%) | 0 (0%) | | | Avg Warranty | 25.0 yrs | 25.0 yrs | | ## Efficiency distribution | Efficiency band | AEET | Viessmann | | --- | --- | --- | | \<20% | 5 (100.0%) | 3 (27.3%) | | 20-21% | 0 | 6 (54.5%) | | 21-22% | 0 | 2 (18.2%) | ## Power distribution | Power band | AEET | Viessmann | | --- | --- | --- | | \<400W | 5 (100.0%) | 6 (54.5%) | | 400-499W | 0 | 5 (45.5%) | ## Cell technology Dominant cell tech: **PERC** (100%) Dominant cell tech: **PERC** (73%) | Technology | AEET | Viessmann | | --- | --- | --- | | PERC | 5 (100.0%) | 8 (72.7%) | | Unknown | 0 | 3 (27.3%) | ## Top panels, AEET | # | Model | Power | Efficiency | Temp. coefficient | Technology | | --- | --- | --- | --- | --- | --- | | 1 | [SE200M(24)F](https://comparepv.com/panel/aeet-se200m-24-f) | 200 | 15.7 | - | Monocrystalline | | 2 | [SE195M(24)F](https://comparepv.com/panel/aeet-se195m-24-f) | 195 | 15.3 | - | Monocrystalline | | 3 | [SE190M(24)F](https://comparepv.com/panel/aeet-se190m-24-f) | 190 | 14.9 | - | Monocrystalline | | 4 | [SE185M(24)F](https://comparepv.com/panel/aeet-se185m-24-f) | 185 | 14.5 | - | Monocrystalline | | 5 | [SE180M(24)F](https://comparepv.com/panel/aeet-se180m-24-f) | 180 | 14.1 | - | Monocrystalline | ## Top panels, Viessmann | # | Model | Power | Efficiency | Temp. coefficient | Technology | | --- | --- | --- | --- | --- | --- | | 1 | [M405WE](https://comparepv.com/panel/viessmann-m405we) | 405 | 20.7 | -0.340 | Monocrystalline | | 2 | [M405WK](https://comparepv.com/panel/viessmann-m405wk) | 405 | 20.7 | -0.340 | Monocrystalline | | 3 | [M400WG](https://comparepv.com/panel/viessmann-m400wg) | 400 | 21.3 | -0.340 | Monocrystalline | | 4 | [M400WE](https://comparepv.com/panel/viessmann-m400we) | 400 | 20.4 | -0.340 | Monocrystalline | | 5 | [M400WK](https://comparepv.com/panel/viessmann-m400wk) | 400 | 20.4 | -0.340 | Monocrystalline | | 6 | [M395WG](https://comparepv.com/panel/viessmann-m395wg) | 395 | 21.1 | -0.340 | Monocrystalline | | 7 | [M395WK](https://comparepv.com/panel/viessmann-m395wk) | 395 | 20.1 | -0.340 | Monocrystalline | | 8 | [M390WG](https://comparepv.com/panel/viessmann-m390wg) | 390 | 20.8 | -0.340 | Monocrystalline | | 9 | [P265PGHC](https://comparepv.com/panel/viessmann-p265pghc) | 265 | 16.3 | -0.420 | Polycrystalline | | 10 | [P260PGHC](https://comparepv.com/panel/viessmann-p260pghc) | 260 | 16.0 | -0.420 | Polycrystalline | ## Summary AEET Energy Group GmbH is a German photovoltaic wholesale and full-service specialist headquartered in Bad Gandersheim, Germany. The company has been active in PV distribution and project development for many years and describes itself as one of the early movers in European solar, running a certified partner network of more than 500 installers across Germany. AEET does not manufacture panels itself but instead sources modules from leading global manufacturers and resells them alongside planning, installation, and maintenance services. No independent Tier 1 or BloombergNEF bankability listing was found for AEET in available sources. Viessmann, by contrast, is a century-old German energy systems company that began as a heating-technology specialist and has expanded into photovoltaics, heat pumps, and smart home integration; its institutional footprint and brand recognition across Europe are considerably larger than AEET's. Viessmann markets its PV modules under the Vitovolt 300 product family, a range of monocrystalline PERC modules with outputs running from roughly 400 W to 440 Wp, aimed squarely at residential rooftops and small commercial buildings where tight system integration with heating and storage hardware is valued. The Vitovolt 300 carries a 15-year product guarantee and a 25-year performance warranty promising at least 84.8 percent of rated output. AEET, operating as a wholesaler, offers a broader mix of module brands and wattages and targets professional installers rather than end consumers directly; its catalog spans residential through commercial scale, with the actual cell technology varying by the upstream manufacturer supplying any given batch. For a homeowner or small commercial buyer in 2025 who wants a tightly integrated heating-plus-solar system and values dealing with a single, well-known European brand, Viessmann is the more natural choice. For an installer or EPC looking to procure modules at competitive wholesale pricing with flexible brand and wattage options, AEET's distributor model is better suited. The two companies serve meaningfully different points in the supply chain and are not directly interchangeable. \---LINKS--- \- https://www.aeet-energy.com/en/index.php \| AEET Energy Group GmbH - official wholesale partner site \| article \- https://www.enfsolar.com/aeet \| AEET Energy Group GmbH profile - ENF Solar directory \| article \- https://www.viessmann-climatesolutions.com/en/energy-and-heating-solutions/photovoltaics-and-energy-storage.html \| Viessmann Climate Solutions - photovoltaics and storage overview \| article \- https://www.energysage.com/supplier/201/viessmann/ \| Viessmann profile and reviews - EnergySage 2025 \| review \- https://www.viessmann.co.uk/en/products/photovoltaics/vitovolt-300.html \| Vitovolt 300 photovoltaic module - Viessmann UK product page \| article Sources: \- \[AEET Energy Group GmbH - ENF Solar\](https://www.enfsolar.com/aeet) \- \[AEET Energy Group GmbH official site\](https://www.aeet-energy.com/en/index.php) \- \[Viessmann Climate Solutions - Photovoltaics\](https://www.viessmann-climatesolutions.com/en/energy-and-heating-solutions/photovoltaics-and-energy-storage.html) \- \[Viessmann profile - EnergySage\](https://www.energysage.com/supplier/201/viessmann/) \- \[Vitovolt 300 - Viessmann UK\](https://www.viessmann.co.uk/en/products/photovoltaics/vitovolt-300.html) Written by claude-sonnet from the figures above. ## Other comparisons - [AEET vs A.B. Energy](https://comparepv.com/aeet-vs-a-b-energy) - [AE Solar vs Viessmann](https://comparepv.com/ae-solar-vs-viessmann) - [AEET vs AIKO](https://comparepv.com/aeet-vs-aiko) - [AKCOME vs Viessmann](https://comparepv.com/akcome-vs-viessmann) - [AEET vs ARTsolar](https://comparepv.com/aeet-vs-artsolar) - [ASM vs Viessmann](https://comparepv.com/asm-vs-viessmann) --- Source: https://comparepv.com/aeet-vs-viessmann Not in this file, on the page: the distributions above drawn as charts.