--- title: "AIKO vs Viessmann - Brand Comparison | ComparePV" description: "Compare AIKO vs Viessmann solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background." source: "https://comparepv.com/aiko-vs-viessmann" --- # AIKO vs Viessmann AIKO has the broader catalog (144 vs 11 models). AIKO leads on peak efficiency at 25.20%. AIKO leans bifacial (24% of lineup). ## The two companies | Attribute | AIKO | Viessmann | | --- | --- | --- | | Country | China | Germany | | Headquarters | Shanghai | Allendorf | | Founded | 2009 | 1917 | | Employees | | | | Annual capacity | | | | Tier 1 | yes | no | | Listed | SZSE: 600732 | | | Website | [https://www.aikosolar.com](https://www.aikosolar.com) | [https://www.viessmann.com](https://www.viessmann.com) | ## Catalog & Power | Measure | AIKO | Viessmann | Margin | | --- | --- | --- | --- | | Panel Models | 144 | 11 | +133 | | Max Power | 805 W | 405 W | +400 W | | Avg Power | 581 W | 361 W | +221 W | ## Efficiency | Measure | AIKO | Viessmann | Margin | | --- | --- | --- | --- | | Max Efficiency | 25.20% | 21.30% | +3.90 pp | | Avg Efficiency | 23.65% | 19.41% | +4.24 pp | ## Reliability & Warranty | Measure | AIKO | Viessmann | Margin | | --- | --- | --- | --- | | Avg Temp Coefficient | -0.271%/°C | -0.362%/°C | +0.091 | | Bifacial Share | 35 (24%) | 0 (0%) | +24 pp | | Avg Warranty | 29.5 yrs | 25.0 yrs | +4.5 yr | ## Efficiency distribution AIKO skews to higher efficiency: 85% of lineup is 23%+ | Efficiency band | AIKO | Viessmann | | --- | --- | --- | | \<20% | 3 (2.1%) | 3 (27.3%) | | 20-21% | 3 (2.1%) | 6 (54.5%) | | 21-22% | 3 (2.1%) | 2 (18.2%) | | 22-23% | 12 (8.3%) | 0 | | 23%+ | 123 (85.4%) | 0 | ## Power distribution AIKO offers more 600W+ panels (60% of lineup) | Power band | AIKO | Viessmann | | --- | --- | --- | | \<400W | 2 (1.4%) | 6 (54.5%) | | 400-499W | 50 (34.7%) | 5 (45.5%) | | 500-599W | 5 (3.5%) | 0 | | 600-699W | 78 (54.2%) | 0 | | 700W+ | 9 (6.2%) | 0 | ## Cell technology Dominant cell tech: **Back Contact** (83%) Dominant cell tech: **PERC** (73%) | Technology | AIKO | Viessmann | | --- | --- | --- | | Back Contact | 119 (82.6%) | 0 | | N-type | 17 (11.8%) | 0 | | PERC | 7 (4.9%) | 8 (72.7%) | | Flexible | 1 (0.7%) | 0 | | Unknown | 0 | 3 (27.3%) | ## Top panels, AIKO | # | Model | Power | Efficiency | Temp. coefficient | Technology | | --- | --- | --- | --- | --- | --- | | 1 | [AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 | 25.1 | -0.260 | Monocrystalline | | 2 | [AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 | 24.9 | -0.260 | Monocrystalline | | 3 | [AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 | 24.8 | -0.260 | Monocrystalline | | 4 | [AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 | 24.6 | -0.260 | Monocrystalline | | 5 | [AIKO-A785-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a785-grh78dw) | 785 | 24.4 | -0.260 | Monocrystalline | | 6 | [AIKO-A780-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a780-grh78dw) | 780 | 24.3 | -0.260 | Monocrystalline | | 7 | [AIKO-A775-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a775-grh78dw) | 775 | 24.1 | -0.260 | Monocrystalline | | 8 | [AIKO-A770-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a770-grh78dw) | 770 | 24.0 | -0.260 | Monocrystalline | | 9 | [AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 | 25.0 | -0.260 | Monocrystalline | | 10 | [AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 | 24.9 | -0.260 | 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 AIKO is a Chinese solar manufacturer founded in 2009 and headquartered in Nanjing, publicly listed on the Chinese stock exchange. The company has built its identity almost entirely around ABC (All Back Contact) cell technology, a proprietary N-type architecture that has pushed certified module efficiencies to 25.2% - a world record demonstrated at Intersolar 2024, according to pv-magazine. AIKO has announced multi-GW capacity expansion plans and has received Tier 1 bankability recognition in recent cycles, reflecting growing lender confidence. Viessmann, by contrast, is a German group with roots dating to 1917, originally a specialist in heating and climate systems who added solar thermal and PV modules as part of a broader home-energy portfolio. Its Vitovolt 300 line uses mainstream monocrystalline PERC technology and is distributed primarily across European residential markets. Viessmann does not appear on the major BloombergNEF Tier 1 module lists, reflecting its smaller footprint in the standalone solar module segment. In terms of institutional presence in the global PV industry, AIKO carries the stronger standing. AIKO's product range is aimed squarely at buyers who want maximum watt-output from a constrained roof area - premium residential rooftops and increasingly commercial projects where space efficiency commands a price premium. Its Comet and INFINITE BC series offer outputs in the 625 W to 650 W range at efficiencies above 24%, per pv-tech reporting on capacity upgrades. Viessmann's Vitovolt 300 panels, such as the 415 W all-black variant, are more conventionally specified PERC modules priced and packaged to appeal to European homeowners who already buy Viessmann boilers or heat pumps and want a single-brand integrated energy solution. Viessmann is essentially a system integrator that includes PV rather than a dedicated panel innovator. For a buyer whose primary goal is high efficiency and long-term bankability in a pure solar project, AIKO is the stronger choice in 2025 - particularly where roof space is limited. Viessmann makes sense for a European homeowner who values brand familiarity and wants PV bundled into a whole-home energy package from a single supplier, but those buyers should verify that Viessmann sources or manufactures its cells to the same standards they would demand from a dedicated PV brand. \---LINKS--- \- https://www.pv-magazine.com/2024/06/19/aiko-presents-abc-solar-module-with-world-record-efficiency-of-25-2-at-intersolar/ \| AIKO presents ABC module with world-record 25.2% efficiency at Intersolar \| article \- https://www.pv-tech.org/aiko-capacity-upgrades-abc-cell-technology/ \| AIKO steps up ABC transition with 11 GW capacity upgrade \| article \- https://www.solarchoice.net.au/products/panels/aiko-solar-panels-review/ \| AIKO Solar Panels - independent review by Solar Choice \| review \- https://www.solarquotes.com.au/panels/aiko-solar-review.html \| AIKO Solar panel review - SolarQuotes \| review \- https://www.energysage.com/supplier/201/viessmann/ \| Viessmann profile and reviews - EnergySage \| review Sources: \- \[AIKO presents ABC solar module with world record efficiency of 25.2% at Intersolar - pv magazine\](https://www.pv-magazine.com/2024/06/19/aiko-presents-abc-solar-module-with-world-record-efficiency-of-25-2-at-intersolar/) \- \[Aiko steps up ABC transition with 11GW capacity upgrade - PV Tech\](https://www.pv-tech.org/aiko-capacity-upgrades-abc-cell-technology/) \- \[Aiko Solar Panels Review - Solar Choice\](https://www.solarchoice.net.au/products/panels/aiko-solar-panels-review/) \- \[Aiko Solar panel review - SolarQuotes\](https://www.solarquotes.com.au/panels/aiko-solar-review.html) \- \[Viessmann profile and reviews - EnergySage\](https://www.energysage.com/supplier/201/viessmann/) Written by claude-sonnet from the figures above. ## Other comparisons - [AIKO vs A.B. Energy](https://comparepv.com/aiko-vs-a-b-energy) - [AE Solar vs Viessmann](https://comparepv.com/ae-solar-vs-viessmann) - [AIKO vs AEET](https://comparepv.com/aiko-vs-aeet) - [AKCOME vs Viessmann](https://comparepv.com/akcome-vs-viessmann) - [AIKO vs ARTsolar](https://comparepv.com/aiko-vs-artsolar) - [ASM vs Viessmann](https://comparepv.com/asm-vs-viessmann) --- Source: https://comparepv.com/aiko-vs-viessmann Not in this file, on the page: the distributions above drawn as charts.