--- title: "ASM vs Viessmann - Brand Comparison | ComparePV" description: "Compare ASM vs Viessmann solar panels: full portfolio, efficiency, cell technology breakdown, warranty terms and company background." source: "https://comparepv.com/asm-vs-viessmann" --- # ASM vs Viessmann Viessmann has the broader catalog (11 vs 1 models). Viessmann leads on peak efficiency at 21.30%. ## The two companies | Attribute | ASM | Viessmann | | --- | --- | --- | | Country | Australia | Germany | | Headquarters | Hallam, Victoria | Allendorf | | Founded | 2009 | 1917 | | Employees | 1-10 | | | Annual capacity | | | | Tier 1 | no | no | | Listed | | | | Website | [https://www.australiansolarmanufacturing.com.au](https://www.australiansolarmanufacturing.com.au) | [https://www.viessmann.com](https://www.viessmann.com) | Australian Solar Manufacturing (ASM) is a small Australian solar panel assembler that produces crystalline monocrystalline modules domestically using components sourced from Germany, Japan, the USA, and China. The company focuses on providing locally assembled PV modules tailored to Australian conditions, supporting... ## Catalog & Power | Measure | ASM | Viessmann | Margin | | --- | --- | --- | --- | | Panel Models | 1 | 11 | +10 | | Max Power | 170 W | 405 W | +235 W | | Avg Power | 170 W | 361 W | +191 W | ## Efficiency | Measure | ASM | Viessmann | Margin | | --- | --- | --- | --- | | Max Efficiency | 16.00% | 21.30% | +5.30 pp | | Avg Efficiency | 16.00% | 19.41% | +3.41 pp | ## Reliability & Warranty | Measure | ASM | Viessmann | Margin | | --- | --- | --- | --- | | Avg Temp Coefficient | -0.438%/°C | -0.362%/°C | +0.076 | | Bifacial Share | 0 (0%) | 0 (0%) | | | Avg Warranty | - | 25.0 yrs | | ## Efficiency distribution | Efficiency band | ASM | Viessmann | | --- | --- | --- | | \<20% | 1 (100.0%) | 3 (27.3%) | | 20-21% | 0 | 6 (54.5%) | | 21-22% | 0 | 2 (18.2%) | ## Power distribution | Power band | ASM | Viessmann | | --- | --- | --- | | \<400W | 1 (100.0%) | 6 (54.5%) | | 400-499W | 0 | 5 (45.5%) | ## Cell technology Dominant cell tech: **PERC** (73%) | Technology | ASM | Viessmann | | --- | --- | --- | | Unknown | 1 (100.0%) | 3 (27.3%) | | PERC | 0 | 8 (72.7%) | ## Top panels, ASM | # | Model | Power | Efficiency | Temp. coefficient | Technology | | --- | --- | --- | --- | --- | --- | | 1 | [ASM170M](https://comparepv.com/panel/australian-solar-manufacturing-asm170m) | 170 | 16.0 | -0.438 | 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 ASM Solar is identifiable in publicly available sources as an Australian solar installation and services company; no evidence emerged through multiple searches of it operating as an independent photovoltaic module manufacturer with proprietary cell production, reported gigawatt-scale capacity, or Tier 1 or BloombergNEF bankability recognition. Viessmann, by contrast, is a well-documented German climate-solutions company founded in 1917 and headquartered in Allendorf, Germany - now trading under the Viessmann Climate Solutions banner following a 2023 acquisition by Carrier Global. Viessmann does not appear prominently on publicly accessible BNEF Tier 1 module lists, suggesting it operates at smaller volumes than the Asian mass-market leaders, but its brand pedigree and engineering heritage give it a credible institutional footprint across Europe. Viessmann's photovoltaic offering centers on the Vitovolt 300 series, monocrystalline modules confirmed in product documentation to use PERC cell architecture, with newer N-type double-glass variants appearing in the range. The lineup targets residential rooftops and light-commercial buildings rather than utility-scale ground-mount installations, and is designed to integrate with Viessmann's own inverters, the Vitocharge VX3 battery storage unit, and the ViCare energy management app. Because ASM Solar is positioned in search results as an installer rather than a module brand, its panel offerings depend on third-party manufacturers rather than proprietary cell production. For a buyer evaluating solar panels in 2025, Viessmann offers a traceable product family with documented warranty terms - a product guarantee of up to 15 years and a 25-year output promise - and genuine manufacturing provenance. ASM Solar may be a capable regional installer, but without confirmable panel-manufacturing credentials it cannot be assessed on equal terms as a module brand. Buyers comparing the two should request the underlying module datasheet from any ASM-quoted system before making a decision. \---LINKS--- \- https://www.energysage.com/supplier/201/viessmann/ \| Viessmann profile and reviews on EnergySage \| review \- https://www.productreview.com.au/listings/asm-solar \| ASM Solar customer reviews - ProductReview Australia \| review \- https://www.enfsolar.com/viessmann \| Viessmann solar manufacturer entry - ENF Solar directory \| article Sources: \- \[Viessmann - Profile & Reviews - 2025\](https://www.energysage.com/supplier/201/viessmann/) \- \[ASM Solar reviews \| ProductReview.com.au\](https://www.productreview.com.au/listings/asm-solar) \- \[Viessmann Generations Group GmbH & Co. KG \| Solar Panels \| Germany\](https://www.enfsolar.com/viessmann) \- \[Vitovolt 300 High-yield photovoltaic modules\](https://www.viessmann-climatesolutions.com/en/newsroom/solution-offering/vitovolt-300-high-yield-photovoltaic-modules-of-the-highest-quality.html) Written by claude-sonnet from the figures above. ## Other comparisons - [ASM vs A.B. Energy](https://comparepv.com/asm-vs-a-b-energy) - [AE Solar vs Viessmann](https://comparepv.com/ae-solar-vs-viessmann) - [ASM vs AEET](https://comparepv.com/asm-vs-aeet) - [AIKO vs Viessmann](https://comparepv.com/aiko-vs-viessmann) - [ASM vs AKCOME](https://comparepv.com/asm-vs-akcome) - [ARTsolar vs Viessmann](https://comparepv.com/artsolar-vs-viessmann) --- Source: https://comparepv.com/asm-vs-viessmann Not in this file, on the page: the distributions above drawn as charts.