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Viessmann Boilers at a Glance


  • Viessmann is one of the oldest and most popular boiler manufacturers in the world
  • Condensing and condensing combi boilers available
  • Lots of sizes
  • Compact units
  • Quiet operation
  • Every model is ENERGY STAR® certified
  • AFUE rating of 95 or 98 percent
  • Boilers have unique design features and proprietary components
  • Good warranty
  • Modulation ratio as high as 1:14
  • Reliable and long-lasting units
  • Units are compact
  • Some models have built-in Wi-Fi

Room For Improvement

  • Can be difficult to find HVAC experts knowledgeable about the brand and products
  • Improper installation can lead to operational problems (although this is true in general)
  • Model selection is very limited

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